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Umeyama T, Mizutani D, Ikeda Y, Osterloh WR, Yamamoto F, Kato K, Yamakata A, Higashi M, Urakami T, Sato H, Imahori H. An emissive charge-transfer excited-state at the well-defined hetero-nanostructure interface of an organic conjugated molecule and two-dimensional inorganic nanosheet. Chem Sci 2023; 14:11914-11923. [PMID: 37920360 PMCID: PMC10619621 DOI: 10.1039/d3sc03604a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Accepted: 10/03/2023] [Indexed: 11/04/2023] Open
Abstract
Precise engineering of excited-state interactions between an organic conjugated molecule and a two-dimensional semiconducting inorganic nanosheet, specifically the manipulation of charge-transfer excited (CTE) states, still remains a challenge for state-of-the-art photochemistry. Herein, we report a long-lived, highly emissive CTE state at structurally well-defined hetero-nanostructure interfaces of photoactive pyrene and two-dimensional MoS2 nanosheets via an N-benzylsuccinimide bridge (Py-Bn-MoS2). Spectroscopic measurements reveal that no charge-transfer state is formed in the ground state, but the locally-excited (LE) state of pyrene in Py-Bn-MoS2 efficiently generates an unusual emissive CTE state. Theoretical studies elucidate the interaction of MoS2 vacant orbitals with the pyrene LE state to form a CTE state that shows a distinct solvent dependence of the emission energy. This is the first example of organic-inorganic 2D hetero-nanostructures displaying mixed luminescence properties by an accurate design of the bridge structure, and therefore represents an important step in their applications for energy conversion and optoelectronic devices and sensors.
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Affiliation(s)
- Tomokazu Umeyama
- Department of Applied Chemistry, Graduate School of Engineering, University of Hyogo Himeji Hyogo 671-2280 Japan
| | - Daizu Mizutani
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University Kyoto 615-8510 Japan
| | - Yuki Ikeda
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University Kyoto 615-8510 Japan
| | - W Ryan Osterloh
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University Kyoto 615-8510 Japan
| | - Futa Yamamoto
- Department of Applied Chemistry, Graduate School of Engineering, University of Hyogo Himeji Hyogo 671-2280 Japan
| | - Kosaku Kato
- Graduate School of Natural Science and Technology, Okayama University Okayama 700-8530 Japan
| | - Akira Yamakata
- Graduate School of Natural Science and Technology, Okayama University Okayama 700-8530 Japan
| | - Masahiro Higashi
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University Kyoto 615-8510 Japan
| | - Takumi Urakami
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University Kyoto 615-8510 Japan
| | - Hirofumi Sato
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University Kyoto 615-8510 Japan
| | - Hiroshi Imahori
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University Kyoto 615-8510 Japan
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University Kyoto 606-8501 Japan
- Institute for Liberal Arts and Sciences (ILAS), Kyoto University Kyoto 606-8501 Japan
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Sachith BM, Okamoto T, Ghimire S, Umeyama T, Takano Y, Imahori H, Biju V. Long-Range Interfacial Charge Carrier Trapping in Halide Perovskite-C 60 and Halide Perovskite-TiO 2 Donor-Acceptor Films. J Phys Chem Lett 2021; 12:8644-8651. [PMID: 34472862 DOI: 10.1021/acs.jpclett.1c01909] [Citation(s) in RCA: 10] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Interfacial electron transfer across perovskite-electron acceptor heterojunctions plays a significant role in the power-conversion efficiency of perovskite solar cells. Thus, electron donor-acceptor thin films of halide perovskite nanocrystals receive considerable attention. Nevertheless, understanding and optimizing distance- and thickness-dependent electron transfer in perovskite-electron acceptor heterojunctions are important. We reveal the distance-dependent and diffusion-controlled interfacial electron transfer across donor-acceptor heterojunction films formed by formamidinium or cesium lead bromide (FAPbBr3/CsPbBr3) perovskite nanocrystals with TiO2/C60. Self-assembled nanocrystal films prepared from FAPbBr3 show a longer photoluminescence lifetime than a solution, showing a long-range carrier migration. The acceptors quench the photoluminescence intensity but not the lifetime in a solution, revealing a static electron transfer. Conversely, the electron transfer in the films changes from dynamic to static by moving toward the donor-acceptor interface. While radiative recombination dominates the electron transfer at 800 μm or farther, the acceptors scavenge the photogenerated carriers within 100 μm. This research highlights the significance of interfacial electron transfer in perovskite films.
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Affiliation(s)
| | - Takuya Okamoto
- Research Institute for Electronic Science, Hokkaido University, N20W10, Sapporo, Hokkaido 001-0020, Japan
| | - Sushant Ghimire
- Institute of Physics, University of Rostock, Albert-Einstein-Straβe 23, 18059 Rostock, Germany
| | - Tomokazu Umeyama
- Department of Applied Chemistry, Graduate School of Engineering, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2201, Japan
| | - Yuta Takano
- Graduate School of Environmental Science, Hokkaido University, N10W5, Sapporo, Hokkaido 060-810, Japan
- Institute of Physics, University of Rostock, Albert-Einstein-Straβe 23, 18059 Rostock, Germany
| | - Hiroshi Imahori
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku Kyoto 615-8510, Japan
| | - Vasudevanpillai Biju
- Graduate School of Environmental Science, Hokkaido University, N10W5, Sapporo, Hokkaido 060-810, Japan
- Institute of Physics, University of Rostock, Albert-Einstein-Straβe 23, 18059 Rostock, Germany
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Morisue M, Saito G, Sasada D, Umeyama T, Imahori H, Mitamura K, Masunaga H, Hoshino T, Sakurai S, Sasaki S. Glassy Porphyrin/C 60 Composites: Morphological Engineering of C 60 Fullerene with Liquefied Porphyrins. Langmuir 2020; 36:13583-13590. [PMID: 33147035 DOI: 10.1021/acs.langmuir.0c02427] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Morphological control of C60 fullerene using liquefied porphyrins (1 and 2) as the host matrices was explored. Slow evaporation of the solvent of the equimolar mixture of porphyrin and C60 in toluene afforded the porphyrin/C60 composite with a 3:1 molar ratio. The stoichiometric binding behaviors suggest that specific porphyrin-C60 interactions operate the formation of the porphyrin/C60 composites, as corroborated by spectroscopic and thermal properties, and glazing-incidence wide-angle X-ray diffraction. Under the bulk conditions, the conventional thermodynamic advantage of multiple binding cooperativity for molecular recognition is unlikely to explain the stoichiometric binding behaviors. Instead, we propose a size-matching effect on the porphyrin-C60 interaction in the bulk porphyrin matrices, i.e., "supramolecular solvation". The glassy nature of the porphyrin matrices was transmitted to C60 through the specific interaction, and the porphyrin/C60 composites adopted glassy states at room temperature.
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Affiliation(s)
- Mitsuhiko Morisue
- Faculty of Molecular Chemistry and Engineering, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
| | - Genki Saito
- Faculty of Molecular Chemistry and Engineering, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
| | - Daiki Sasada
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Tomokazu Umeyama
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Hiroshi Imahori
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Koji Mitamura
- Electronic Materials Research Division, Osaka Research Institute of Industrial Science and Technology, 1-6-50, Morinomiya, Joto-ku, Osaka 536-8553, Japan
| | - Hiroyasu Masunaga
- Japan Synchrotron Radiation Research Institute (JASRI/SPring-8), Hyogo 679-5198, Japan
| | - Taiki Hoshino
- RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan
| | - Shinichi Sakurai
- Faculty of Fiber Science and Engineering, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
| | - Sono Sasaki
- Faculty of Fiber Science and Engineering, Kyoto Institute of Technology, Matsugasaki, Sakyo-ku, Kyoto 606-8585, Japan
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Umeyama T, Igarashi K, Sasada D, Ishida K, Koganezawa T, Ohtani S, Tanaka K, Imahori H. Efficient Exciton Diffusion in Micrometer-Sized Domains of Nanographene-Based Nonfullerene Acceptors with Long Exciton Lifetimes in Blend Films with Conjugated Polymer. ACS Appl Mater Interfaces 2020; 12:39236-39244. [PMID: 32822164 DOI: 10.1021/acsami.0c10834] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Phase-separated structures in photoactive layers composed of electron donors and acceptors in organic photovoltaics (OPVs) generally exert a profound impact on the device performance. In this study, nonfullerene acceptors (NFAs) where a heteronanographene central core was furnished with branched alkoxy chains of different lengths, TACIC-EH, TACIC-BO, and TACIC-HD, were prepared to adjust the aggregation tendency and systematically probe the relationships of film structures with photophysical and photovoltaic properties. The side-chain length showed negligible effects on the absorption properties and energy levels of TACICs. In addition, regardless of the chain length, all TACIC films exhibited characteristically long singlet exciton lifetimes (1330-2330 ps) compared to those in solution (≤220 ps). Using a conjugated polymer donor, PBDB-T, the best OPV performance was achieved with TACIC-BO that contained medium-length chains, exhibiting a power conversion efficiency (PCE) of 9.92%. TACIC-HD with the longest chains showed deteriorated electron mobility due to the long insulating alkoxy groups. Therefore, the PBDB-T:TACIC-HD-based device revealed a low charge collection efficiency and PCE (8.21%) relative to the PBDB-T:TACIC-BO-based device, but their film morphologies were analogous. Meanwhile, TACIC-EH with the shortest chains showed low solubility and formed micrometer-sized large aggregates in the blend film with PBDB-T. Although the charge collection efficiency of PBDB-T:TACIC-EH was lower than that of PBDB-T:TACIC-BO, the efficiencies of exciton diffusion to the donor-acceptor interface were sufficiently high (>98%) owing to the elongated singlet exciton lifetime of TACIC-EH. The PCE of the PBDB-T:TACIC-EH-based device remained moderate (7.10%). Therefore, TACICs with the long singlet exciton lifetimes in the films provide a clear guideline for NFAs with low sensitivity of OPV device performance to the blend film structures, which is advantageous for large-scale OPV production with high reproducibility.
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Affiliation(s)
- Tomokazu Umeyama
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Kensho Igarashi
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Daiki Sasada
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Keiichi Ishida
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Tomoyuki Koganezawa
- Japan Synchrotron Radiation Research Institute, 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan
| | - Shunsuke Ohtani
- Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Kazuo Tanaka
- Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Hiroshi Imahori
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
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Umeyama T, Ohara T, Tsutsui Y, Nakano S, Seki S, Imahori H. Noncovalent Functionalization of Few-Layered Antimonene with Fullerene Clusters and Photoinduced Charge Separation in the Composite. Chemistry 2020; 26:6726-6735. [PMID: 32314835 DOI: 10.1002/chem.202001740] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Indexed: 11/08/2022]
Abstract
Few-layered antimonene (FLSb) nanosheets were noncovalently functionalized with fullerene C60 clusters by quick addition of a poor solvent (i.e., acetonitrile) into a mixed dispersion of FLSb and C60 in a good solvent (i.e., toluene). In a flash-photolysis time-resolved microwave conductivity (FP-TRMC) measurement, the FLSb-C60 composite, (FLSb+C60 )m , showed a rapid rise in transient conductivity, whereas no conductivity signal was observed in the single components, FLSb and C60 . This demonstrated the occurrence of photoinduced charge separation between FLSb and C60 in (FLSb+C60 )m . Furthermore, a photoelectrochemical device with an electrophoretically deposited (FLSb+C60 )m film exhibited an enhanced efficiency of photocurrent generation, compared to those of the single-components, FLSb and C60 , due to the photoinduced charge separation between FLSb and C60 . This work provides a promising approach for fabrication of antimonene-organic molecule composites and paves the way for their application in optoelectronics.
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Affiliation(s)
- Tomokazu Umeyama
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto, 615-8510, Japan
| | - Tomoya Ohara
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto, 615-8510, Japan
| | - Yusuke Tsutsui
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto, 615-8510, Japan
| | - Shota Nakano
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto, 615-8510, Japan
| | - Shu Seki
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto, 615-8510, Japan
| | - Hiroshi Imahori
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto, 615-8510, Japan.,Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Sakyo-ku, Kyoto, 606-8501, Japan
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6
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Umeyama T, Igarashi K, Sasada D, Tamai Y, Ishida K, Koganezawa T, Ohtani S, Tanaka K, Ohkita H, Imahori H. Efficient light-harvesting, energy migration, and charge transfer by nanographene-based nonfullerene small-molecule acceptors exhibiting unusually long excited-state lifetime in the film state. Chem Sci 2020; 11:3250-3257. [PMID: 34122832 PMCID: PMC8157473 DOI: 10.1039/c9sc06456g] [Citation(s) in RCA: 25] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Electron-acceptor small-molecules possessing a long exciton lifetime and a narrow energy band gap, opposing the energy gap law, are highly desirable for high-performance organic photovoltaics (OPVs) by realizing their efficient light-harvesting ability (LH), exciton diffusion (ED), and charge transfer (CT). Toward this goal, we designed an acceptor–donor–acceptor (A–D–A) type nonfullerene acceptor (NFA), TACIC, having an electron-donating, self-assembling two-dimensional (2D) nanographene unit, thienoazacoronene, at the center with electron-withdrawing groups at both ends. The TACIC film exhibited a narrow band gap (1.59 eV) with excellent LH. Surprisingly, the TACIC film showed an extremely long exciton lifetime (1.59 ns), suppressing undesirable nonradiative decay by its unique self-assembling behavior. When combined with a conjugated polymer donor, PBDB-T, slow ED and CT were observed (60 ps) with the excitation of TACIC owing to the large TACIC domain sizes. Nevertheless, the unusually high efficiencies of ED and CT (96% in total) were achieved by the long TACIC exciton lifetime. Additionally, unusual energy transfer (EnT) from the excited PBDB-T to TACIC was seen, demonstrating its dual LH role. The OPV device with PBDB-T and TACIC showed a high incident photon-to-current efficiency (IPCE) exceeding 70% at up to 710 nm and a power conversion efficiency of ∼10%. This result will open up avenues for a rational strategy of OPVs where LH, ED, and CT from the acceptor side as well as LH, EnT, ED, and CT from the donor side can be better designed by using 2D nanographene as a promising building block for high-performance A–D–A type NFAs. A nonfullerene acceptor, TACIC, showed efficient light-harvesting, exciton diffusion, and charge transfer.![]()
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Affiliation(s)
- Tomokazu Umeyama
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University Nishikyo-ku Kyoto 615-8510 Japan
| | - Kensho Igarashi
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University Nishikyo-ku Kyoto 615-8510 Japan
| | - Daiki Sasada
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University Nishikyo-ku Kyoto 615-8510 Japan
| | - Yasunari Tamai
- Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University Nishikyo-ku Kyoto 615-8510 Japan .,Japan Science and Technology Agency (JST), PRESTO 4-1-8 Honcho Kawaguchi Saitama 332-0012 Japan
| | - Keiichi Ishida
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University Nishikyo-ku Kyoto 615-8510 Japan
| | - Tomoyuki Koganezawa
- Japan Synchrotron Radiation Research Institute 1-1-1, Kouto, Sayo-cho, Sayo-gun Hyogo 679-5198 Japan
| | - Shunsuke Ohtani
- Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University Nishikyo-ku Kyoto 615-8510 Japan
| | - Kazuo Tanaka
- Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University Nishikyo-ku Kyoto 615-8510 Japan
| | - Hideo Ohkita
- Department of Polymer Chemistry, Graduate School of Engineering, Kyoto University Nishikyo-ku Kyoto 615-8510 Japan
| | - Hiroshi Imahori
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University Nishikyo-ku Kyoto 615-8510 Japan .,Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University Sakyo-ku Kyoto 606-8501 Japan
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Umeyama T, Okawada Y, Ohara T, Imahori H. Spontaneous Complexation of Fullerene Aggregates on Nanodiamond Aggregates and Their Enhanced Photocurrent Generation. Chem Asian J 2019; 14:4042-4047. [PMID: 31334595 DOI: 10.1002/asia.201900835] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2019] [Indexed: 11/09/2022]
Abstract
Supramolecular composites composed of fullerene C60 and carbon nanodiamond (ND) were constructed through spontaneous complexation of C60 aggregates onto the surface of ND aggregates in N-methylpyrrolidone (NMP). The resulting C60 -ND composite was assembled onto a nanostructured SnO2 electrode by an electrophoretic deposition method. Formation of the C60 -ND composite was confirmed by dynamic light scattering (DLS) and field-emission scanning electron microscopy (FESEM). The C60 -ND composite on the SnO2 electrode showed high incident photon-to-current efficiencies (IPCEs) in the visible region as compared with the single component system of C60 or ND. The improved photocurrent generation of the C60 -ND composite may result from the photoinduced charge separation at the interface between C60 and ND. These results obtained here will provide valuable information on the design of optoelectronic devices based on all-nanocarbon materials.
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Affiliation(s)
- Tomokazu Umeyama
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto, 615-8510, Japan
| | - Yohei Okawada
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto, 615-8510, Japan
| | - Tomoya Ohara
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto, 615-8510, Japan
| | - Hiroshi Imahori
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto, 615-8510, Japan.,Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Sakyo-ku, Kyoto, 606-8501, Japan
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Abstract
Solar energy conversion is one of the most important issues for creating and maintaining a future sustainable society. In this regard, photovoltaic technologies have attracted much attention because of their potential to solve energy and environmental issues. In particular, thin-film solar cells, such as organic photovoltaics (OPVs) and perovskite solar cells (PSCs), are highly promising owing to their flexibility, light weight, and low-cost production. One of the most important factors used to evaluate solar-cell performance is the power conversion efficiency (PCE), which is the ratio of the output electric power divided by the input light power. The PCEs of PSCs have become comparable to those of multicrystalline silicon solar cells in a laboratory level, but the PCEs of OPVs have yet to catch up with them and still need to be improved. The insufficient durability of PSCs and OPVs is also a challenge that needs to be addressed. Fullerene derivatives have been utilized as electron acceptors and electron-transport materials in OPVs and PSCs. However, the use of fullerene derivatives requires attention to their isomers if they are multiadducts or even monoadducts produced from fullerenes with low symmetry. Their nonuniform structures and electronic properties may exert a negative effect on photovoltaic properties. However, most researchers in the field of OPVs and PSCs have been unaware of the importance of the isomerism. Even the most prevalent, high-performance fullerene acceptor, [6,6]-phenyl-C71-butyric acid methyl ester ([70]PCBM), has been used as an isomer mixture. In this Account, we summarize recent studies on the effects of isomer separation of fullerene derivatives on the device performances of OPVs and PSCs. Largely, fullerene derivatives containing various isomers are categorized into [60]fullerene bisadducts, [70]fullerene bisadducts, and [70]fullerene monoadducts. In all cases, the difference in isomerism was found to have a large impact on PCEs. The miscibility with polymer donors and film-forming property of fullerene derivatives were affected by the isomer separations, which exert the most potent influence on device performances. Although the disorders in energy levels among isomers are not definitely influencing on photovoltaic properties of isomer mixtures, the molecular packing structures of fullerene derivatives make a significant effect on their photovoltaic properties. Notably, isomerically pure fullerene derivatives often-but not always-exhibit higher PCEs than the isomer mixture. The search for the best isomers of fullerene derivatives and their optimal compositional ratios, which extensively depend on their roles and the combined materials, will be an indispensable step to achieving consistently higher device performances for OPVs and PSCs.
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Affiliation(s)
- Tomokazu Umeyama
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Hiroshi Imahori
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
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Umeyama T, Hanaoka T, Yamada H, Namura Y, Mizuno S, Ohara T, Baek J, Park J, Takano Y, Stranius K, Tkachenko NV, Imahori H. Exclusive occurrence of photoinduced energy transfer and switching of its direction by rectangular π-extension of nanographenes. Chem Sci 2019; 10:6642-6650. [PMID: 31367317 PMCID: PMC6624990 DOI: 10.1039/c9sc01538h] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/29/2019] [Accepted: 05/28/2019] [Indexed: 01/20/2023] Open
Abstract
As structure defined cutouts of the graphene lattice, nanographene molecules have gained plenty of attention because of their high potential for versatile applications in organic electronics and energy conversion devices and as ideal model systems for the better understanding of intrinsic structure-property correlations of graphenes. In this study, well-defined nanographenes with sp2 carbon networks of different sizes, hexa-peri-hexabenzocoronene (HBC) and its rectangularly π-extended version, a short graphene nanoribbon (GNR), have been covalently functionalized with photoactive porphyrin molecules. On the basis of their spectroscopic studies, the photodynamics of the porphyrin-linked nanographenes was found to be influenced substantially by the size of the nanographenes. Photoexcitation of the porphyrin-HBC linked system led to exclusive energy transfer (EnT) from the first singlet excited state (S1) of the nanographene to the porphyrin, whereas opposite selective EnT occurred from the first and second singlet excited states (S1 and S2) of the porphyrin to the nanographene in the porphyrin-GNR linked system. In particular, ultrafast efficient EnTs from both the S2 and S1 states of the porphyrin to GNR mimic the corresponding ultrafast EnTs from the S2 and S1 states of carotenoids to chlorophylls in light-harvesting systems of natural photosynthesis. Such unique photophysical properties will be useful for the rational design of carbon-based photofunctional nanomaterials for optoelectronics and solar energy conversion devices.
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Affiliation(s)
- Tomokazu Umeyama
- Department of Molecular Engineering , Graduate School of Engineering , Kyoto University , Nishikyo-ku , Kyoto , 615-8510 , Japan . ;
| | - Takuma Hanaoka
- Department of Molecular Engineering , Graduate School of Engineering , Kyoto University , Nishikyo-ku , Kyoto , 615-8510 , Japan . ;
| | - Hiroki Yamada
- Department of Molecular Engineering , Graduate School of Engineering , Kyoto University , Nishikyo-ku , Kyoto , 615-8510 , Japan . ;
| | - Yuki Namura
- Department of Molecular Engineering , Graduate School of Engineering , Kyoto University , Nishikyo-ku , Kyoto , 615-8510 , Japan . ;
| | - Satoshi Mizuno
- Department of Molecular Engineering , Graduate School of Engineering , Kyoto University , Nishikyo-ku , Kyoto , 615-8510 , Japan . ;
| | - Tomoya Ohara
- Department of Molecular Engineering , Graduate School of Engineering , Kyoto University , Nishikyo-ku , Kyoto , 615-8510 , Japan . ;
| | - Jinseok Baek
- Department of Molecular Engineering , Graduate School of Engineering , Kyoto University , Nishikyo-ku , Kyoto , 615-8510 , Japan . ;
| | - JaeHong Park
- Department of Molecular Engineering , Graduate School of Engineering , Kyoto University , Nishikyo-ku , Kyoto , 615-8510 , Japan . ;
| | - Yuta Takano
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS) , Kyoto University , Sakyo-ku , Kyoto 606-8501 , Japan
| | - Kati Stranius
- Faculty of Engineering and Natural Sciences , Tampere University , Korkeakoulunkatu 8 , 33720 Tampere , Finland .
| | - Nikolai V Tkachenko
- Faculty of Engineering and Natural Sciences , Tampere University , Korkeakoulunkatu 8 , 33720 Tampere , Finland .
| | - Hiroshi Imahori
- Department of Molecular Engineering , Graduate School of Engineering , Kyoto University , Nishikyo-ku , Kyoto , 615-8510 , Japan . ;
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS) , Kyoto University , Sakyo-ku , Kyoto 606-8501 , Japan
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10
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Kanda H, Shibayama N, Uzum A, Umeyama T, Imahori H, Ibi K, Ito S. Effect of Silicon Surface for Perovskite/Silicon Tandem Solar Cells: Flat or Textured? ACS Appl Mater Interfaces 2018; 10:35016-35024. [PMID: 30215502 DOI: 10.1021/acsami.8b08701] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Perovskite and textured silicon solar cells were integrated into a tandem solar cell through a stacking method. To consider the effective structure of silicon solar cells for perovskite/silicon tandem solar cells, the optic and photovoltaic properties of textured and flat silicon surfaces were compared using mechanical-stacking-tandem of two- and four-terminal structures by perovskite layers on crystal silicon wafers. The reflectance of the texture silicon surface in the range of 750-1050 nm could be reduced more than that of the flat silicon surface (from 2.7 to 0.8%), which resulted in increases in average incident photon to current conversion efficiency values (from 83.0 to 88.0%) and current density (from 13.7 to 14.8 mA/cm2). Using the texture surface of silicon heterojunction (SHJ) solar cells, the significant conversion efficiency of 21.4% was achieved by four-terminal device, which was an increase of 2.4% from that of SHJ solar cells alone.
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Affiliation(s)
- Hiroyuki Kanda
- Department of Materials and Synchrotron Radiation Engineering, Graduate School of Engineering , University of Hyogo , 2167 Shosha , Himeji 671-0121 , Hyogo , Japan
| | - Naoyuki Shibayama
- Department of Materials and Synchrotron Radiation Engineering, Graduate School of Engineering , University of Hyogo , 2167 Shosha , Himeji 671-0121 , Hyogo , Japan
| | - Abdullah Uzum
- Department of Electrical and Electronics Engineering , Karadeniz Technical University , Trabzon 61080 , Turkey
| | | | | | - Koji Ibi
- Choshu Industry Co., Ltd. , 3740 Shin-Yamanoi , Sanyo-Onoda 757-0003 , Yamaguchi , Japan
| | - Seigo Ito
- Department of Materials and Synchrotron Radiation Engineering, Graduate School of Engineering , University of Hyogo , 2167 Shosha , Himeji 671-0121 , Hyogo , Japan
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11
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Umeyama T, Imahori H. Electron transfer and exciplex chemistry of functionalized nanocarbons: effects of electronic coupling and donor dimerization. Nanoscale Horiz 2018; 3:352-366. [PMID: 32254123 DOI: 10.1039/c8nh00024g] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
In the past few decades, research on the construction of donor-bridge-acceptor linked systems capable of efficient photoinduced charge separation has fundamentally contributed to the fields of artificial photosynthesis and solar energy conversion. Specifically, the above systems are often fabricated by using carbon-based nanomaterials such as fullerenes, carbon nanotubes, and graphenes, offering limitless possibilities of tuning their optical and electronic properties. Accordingly, since understanding the structure-photodynamics relationships of π-aromatic donor-bridge-nanocarbon linked systems is crucial for extracting the full potential of nanocarbon materials, this review summarizes recent research on their photophysical properties featuring nanocarbon materials as electron acceptors. In particular, we highlight the electronic coupling effects on the photodynamics of donor-bridge-nanocarbon acceptor linked systems, together with the effects of donor dimerization. On a basis of their time-resolved spectroscopic data, the photodynamics of donor-bridge-nanocarbon acceptor linked systems is shown to be substantially influenced by the formation and decay of an exciplex state, i.e., an excited-state consisting of a π-molecular donor and a nanocarbon acceptor with partial charge-transfer character. Such basic information is essential for realizing future application of carbon-based nanomaterials in optoelectronic and energy conversion devices.
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Affiliation(s)
- Tomokazu Umeyama
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan.
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12
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Miki K, Saiki K, Umeyama T, Baek J, Noda T, Imahori H, Sato Y, Suenaga K, Ohe K. Unique Tube-Ring Interactions: Complexation of Single-Walled Carbon Nanotubes with Cycloparaphenyleneacetylenes. Small 2018; 14:e1800720. [PMID: 29782702 DOI: 10.1002/smll.201800720] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2018] [Revised: 04/12/2018] [Indexed: 06/08/2023]
Abstract
Carbon nanotubes (CNTs) interlocked by cyclic compounds through supramolecular interaction are promising rotaxane-like materials applicable as 2D and 3D networks of nanowires and disease-specific theranostic agents having multifunctionalities. Supramolecular complexation of CNTs with cyclic compounds in a "ring toss'' manner is a straightforward method to prepare interlocked CNTs; however, to date, this has not been reported on. Here, the "ring toss" method to prepare interlocked CNTs by using π-conjugated carbon nanorings: [8]-, [9]-, and [10]cycloparaphenyleneacetylene (CPPA) is reported. CPPAs efficiently interact with CNTs to form CNT@CPPA complexes, while uncomplexed CPPAs can be recovered without decomposition. CNTs, which tightly fit in the cavities of CPPAs through convex-concave interaction, efficiently afford "tube-in-ring"-type CNT@CPPA complexes. "Tube-in-ring"-type and "ring-on-tube"-type complexation modes are successfully distinguished by spectroscopic, thermogravimetric, and microscopic analyses.
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Affiliation(s)
- Koji Miki
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto, 615-8510, Japan
| | - Kenzo Saiki
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto, 615-8510, Japan
| | - Tomokazu Umeyama
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto, 615-8510, Japan
| | - Jinseok Baek
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto, 615-8510, Japan
| | - Takeru Noda
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto, 615-8510, Japan
| | - Hiroshi Imahori
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto, 615-8510, Japan
- Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University, Yoshidaushinomiya-cho, Sakyo-ku, Kyoto, 606-8501, Japan
| | - Yuta Sato
- Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, 305-8565, Japan
| | - Kazu Suenaga
- Nanomaterials Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, 305-8565, Japan
| | - Kouichi Ohe
- Department of Energy and Hydrocarbon Chemistry, Graduate School of Engineering, Kyoto University, Katsura, Nishikyo-ku, Kyoto, 615-8510, Japan
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13
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Baek J, Umeyama T, Choi W, Tsutsui Y, Yamada H, Seki S, Imahori H. Cover Feature: Formation and Photodynamic Behavior of Transition Metal Dichalcogenide Nanosheet-Fullerene Inorganic/Organic Nanohybrids on Semiconducting Electrodes (Chem. Eur. J. 7/2018). Chemistry 2018. [DOI: 10.1002/chem.201704734] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Jinseok Baek
- Department of Molecular Engineering, Graduate School of Engineering; Kyoto University, Nishikyo-ku; Kyoto 615-8510 Japan
| | - Tomokazu Umeyama
- Department of Molecular Engineering, Graduate School of Engineering; Kyoto University, Nishikyo-ku; Kyoto 615-8510 Japan
| | - Wookjin Choi
- Department of Molecular Engineering, Graduate School of Engineering; Kyoto University, Nishikyo-ku; Kyoto 615-8510 Japan
| | - Yusuke Tsutsui
- Department of Molecular Engineering, Graduate School of Engineering; Kyoto University, Nishikyo-ku; Kyoto 615-8510 Japan
| | - Hiroki Yamada
- Department of Molecular Engineering, Graduate School of Engineering; Kyoto University, Nishikyo-ku; Kyoto 615-8510 Japan
| | - Shu Seki
- Department of Molecular Engineering, Graduate School of Engineering; Kyoto University, Nishikyo-ku; Kyoto 615-8510 Japan
| | - Hiroshi Imahori
- Department of Molecular Engineering, Graduate School of Engineering; Kyoto University, Nishikyo-ku; Kyoto 615-8510 Japan
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS); Kyoto University, Sakyo-ku; Kyoto 606-8501 Japan
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14
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Umeyama T, Takahara S, Shibata S, Igarashi K, Higashino T, Mishima K, Yamashita K, Imahori H. cis-1 Isomers of tethered bismethano[70]fullerene as electron acceptors in organic photovoltaics. RSC Adv 2018; 8:18316-18326. [PMID: 35541128 PMCID: PMC9080571 DOI: 10.1039/c8ra02896f] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/04/2018] [Accepted: 05/10/2018] [Indexed: 11/21/2022] Open
Abstract
Isomer-controlled [70]fullerene bis-adducts can achieve high performance as electron-acceptors in organic photovoltaics (OPVs) because of their stronger absorption intensities than [60]fullerene derivatives, higher LUMO energy levels than mono-adducts, and less structural and energetic disorder than random isomer mixtures. Especially, attractive are cis-1 isomers that have the closest proximity of addends owing to their plausible more regular close packed structure. In this study, propylene-tethered cis-1 bismethano[70]fullerene with two methyl, ethyl, phenyl, or thienyl groups were rationally designed and prepared for the first time to investigate the OPV performances with an amorphous conjugated polymer donor (PCDTBT). The cis-1 products were found to be a mixture of two regioisomers, α-1-α and α-1-β as major and minor components, respectively. Among them, the cis-1 product with two ethyl groups (Et2-cis-1-[70]PBC) showed the highest OPV performance, encouraging us to isolate its α-1-α isomer (Et2-α-1-α-[70]PBC) by high-performance liquid chromatography. OPV devices based on Et2-cis-1-[70]PBC and Et2-α-1-α-[70]PBC with PCDTBT showed open-circuit voltages of 0.844 V and 0.864 V, respectively, which were higher than that of a device with typical [70]fullerene mono-adduct, [70]PCBM (0.831 V) with a lower LUMO level. However, the short-circuit current densities and resultant power conversion efficiencies of the devices with Et2-cis-1-[70]PBC (9.24 mA cm−2, 4.60%) and Et2-α-1-α-[70]PBC (6.35 mA cm−2, 3.25%) were lower than those of the device with [70]PCBM (10.8 mA cm−2, 5.8%) due to their inferior charge collection efficiencies. The results obtained here reveal that cis-1 [70]fullerene bis-adducts do not guarantee better OPV performance and that further optimization of the substituent structures is necessary. cis-1 Isomers of [70]fullerene bis-adducts were utilized as electron-acceptors in organic photovoltaic devices for the first time.![]()
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Affiliation(s)
- Tomokazu Umeyama
- Department of Molecular Engineering
- Graduate School of Engineering
- Kyoto University
- Kyoto 615-8510
- Japan
| | - Shogo Takahara
- Department of Molecular Engineering
- Graduate School of Engineering
- Kyoto University
- Kyoto 615-8510
- Japan
| | - Sho Shibata
- Department of Molecular Engineering
- Graduate School of Engineering
- Kyoto University
- Kyoto 615-8510
- Japan
| | - Kensho Igarashi
- Department of Molecular Engineering
- Graduate School of Engineering
- Kyoto University
- Kyoto 615-8510
- Japan
| | - Tomohiro Higashino
- Department of Molecular Engineering
- Graduate School of Engineering
- Kyoto University
- Kyoto 615-8510
- Japan
| | - Kenji Mishima
- Department of Chemical System Engineering
- School of Engineering
- The University of Tokyo
- Tokyo 113-8656
- Japan
| | - Koichi Yamashita
- Department of Chemical System Engineering
- School of Engineering
- The University of Tokyo
- Tokyo 113-8656
- Japan
| | - Hiroshi Imahori
- Department of Molecular Engineering
- Graduate School of Engineering
- Kyoto University
- Kyoto 615-8510
- Japan
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15
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Umeyama T, Igarashi K, Sakamaki D, Seki S, Imahori H. Unique cohesive nature of the β1-isomer of [70]PCBM fullerene on structures and photovoltaic performances of bulk heterojunction films with PffBT4T-2OD polymers. Chem Commun (Camb) 2018; 54:405-408. [DOI: 10.1039/c7cc08947c] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Decreasing the amount of a diastereomer of β-[70]PCBM with high aggregation tendency improved the performances of OPV devices with PffBT4T-2OD:[70]PCBM films.
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Affiliation(s)
- Tomokazu Umeyama
- Department of Molecular Engineering
- Graduate School of Engineering
- Kyoto University
- Nishikyo-ku
- Kyoto 615-8510
| | - Kensho Igarashi
- Department of Molecular Engineering
- Graduate School of Engineering
- Kyoto University
- Nishikyo-ku
- Kyoto 615-8510
| | - Daisuke Sakamaki
- Department of Molecular Engineering
- Graduate School of Engineering
- Kyoto University
- Nishikyo-ku
- Kyoto 615-8510
| | - Shu Seki
- Department of Molecular Engineering
- Graduate School of Engineering
- Kyoto University
- Nishikyo-ku
- Kyoto 615-8510
| | - Hiroshi Imahori
- Department of Molecular Engineering
- Graduate School of Engineering
- Kyoto University
- Nishikyo-ku
- Kyoto 615-8510
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16
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Baek J, Umeyama T, Choi W, Tsutsui Y, Yamada H, Seki S, Imahori H. Formation and Photodynamic Behavior of Transition Metal Dichalcogenide Nanosheet-Fullerene Inorganic/Organic Nanohybrids on Semiconducting Electrodes. Chemistry 2017; 24:1561-1572. [DOI: 10.1002/chem.201703699] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/08/2017] [Indexed: 11/08/2022]
Affiliation(s)
- Jinseok Baek
- Department of Molecular Engineering, Graduate School of Engineering; Kyoto University, Nishikyo-ku; Kyoto 615-8510 Japan
| | - Tomokazu Umeyama
- Department of Molecular Engineering, Graduate School of Engineering; Kyoto University, Nishikyo-ku; Kyoto 615-8510 Japan
| | - Wookjin Choi
- Department of Molecular Engineering, Graduate School of Engineering; Kyoto University, Nishikyo-ku; Kyoto 615-8510 Japan
| | - Yusuke Tsutsui
- Department of Molecular Engineering, Graduate School of Engineering; Kyoto University, Nishikyo-ku; Kyoto 615-8510 Japan
| | - Hiroki Yamada
- Department of Molecular Engineering, Graduate School of Engineering; Kyoto University, Nishikyo-ku; Kyoto 615-8510 Japan
| | - Shu Seki
- Department of Molecular Engineering, Graduate School of Engineering; Kyoto University, Nishikyo-ku; Kyoto 615-8510 Japan
| | - Hiroshi Imahori
- Department of Molecular Engineering, Graduate School of Engineering; Kyoto University, Nishikyo-ku; Kyoto 615-8510 Japan
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS); Kyoto University, Sakyo-ku; Kyoto 606-8501 Japan
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17
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Hayashi H, Nihashi W, Umeyama T, Matano Y, Seki S, Shimizu Y, Imahori H. Correction to "Segregated Donor-Acceptor Columns in Liquid Crystals That Exhibit Highly Efficient Ambipolar Charge Transport". J Am Chem Soc 2017; 139:13957. [PMID: 28933541 DOI: 10.1021/jacs.7b09424] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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18
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Baranwal AK, Masutani H, Sugita H, Kanda H, Kanaya S, Shibayama N, Sanehira Y, Ikegami M, Numata Y, Yamada K, Miyasaka T, Umeyama T, Imahori H, Ito S. Lead-free perovskite solar cells using Sb and Bi-based A 3B 2X 9 and A 3BX 6 crystals with normal and inverse cell structures. Nano Converg 2017; 4:26. [PMID: 28989856 PMCID: PMC5608797 DOI: 10.1186/s40580-017-0120-3] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/15/2017] [Accepted: 09/17/2017] [Indexed: 05/17/2023]
Abstract
Research of CH3NH3PbI3 perovskite solar cells had significant attention as the candidate of new future energy. Due to the toxicity, however, lead (Pb) free photon harvesting layer should be discovered to replace the present CH3NH3PbI3 perovskite. In place of lead, we have tried antimony (Sb) and bismuth (Bi) with organic and metal monovalent cations (CH3NH3+, Ag+ and Cu+). Therefore, in this work, lead-free photo-absorber layers of (CH3NH3)3Bi2I9, (CH3NH3)3Sb2I9, (CH3NH3)3SbBiI9, Ag3BiI6, Ag3BiI3(SCN)3 and Cu3BiI6 were processed by solution deposition way to be solar cells. About the structure of solar cells, we have compared the normal (n-i-p: TiO2-perovskite-spiro OMeTAD) and inverted (p-i-n: NiO-perovskite-PCBM) structures. The normal (n-i-p)-structured solar cells performed better conversion efficiencies, basically. But, these environmental friendly photon absorber layers showed the uneven surface morphology with a particular grow pattern depend on the substrate (TiO2 or NiO). We have considered that the unevenness of surface morphology can deteriorate the photovoltaic performance and can hinder future prospect of these lead-free photon harvesting layers. However, we found new interesting finding about the progress of devices by the interface of NiO/Sb3+ and TiO2/Cu3BiI6, which should be addressed in the future study.
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Affiliation(s)
- Ajay Kumar Baranwal
- Department of Materials and Synchrotron Radiation Engineering, Graduate School of Engineering, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2280 Japan
| | - Hideaki Masutani
- Department of Materials and Synchrotron Radiation Engineering, Graduate School of Engineering, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2280 Japan
| | - Hidetaka Sugita
- Department of Materials and Synchrotron Radiation Engineering, Graduate School of Engineering, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2280 Japan
| | - Hiroyuki Kanda
- Department of Materials and Synchrotron Radiation Engineering, Graduate School of Engineering, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2280 Japan
| | - Shusaku Kanaya
- Department of Materials and Synchrotron Radiation Engineering, Graduate School of Engineering, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2280 Japan
| | - Naoyuki Shibayama
- Department of Materials and Synchrotron Radiation Engineering, Graduate School of Engineering, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2280 Japan
| | - Yoshitaka Sanehira
- Graduate School of Engineering, Toin University of Yokohama, Yokohama, Kanagawa 225-8503 Japan
| | - Masashi Ikegami
- Graduate School of Engineering, Toin University of Yokohama, Yokohama, Kanagawa 225-8503 Japan
| | - Youhei Numata
- Graduate School of Engineering, Toin University of Yokohama, Yokohama, Kanagawa 225-8503 Japan
| | - Kouji Yamada
- Department of Applied Molecular Chemistry, College of Industrial Technology, Nihon University, 1-2-1, Izumi-Chou, Narashino-Shi, Chiba, 275-8575 Japan
| | - Tsutomu Miyasaka
- Graduate School of Engineering, Toin University of Yokohama, Yokohama, Kanagawa 225-8503 Japan
| | - Tomokazu Umeyama
- Department of Molecular Engineering, Graduate School of Engineering and Institute for Integrated Cell Materials Sciences (WPI-iCeMS), Kyoto University, Nishikyo-Ku, Kyoto, 615-8510 Japan
| | - Hiroshi Imahori
- Department of Molecular Engineering, Graduate School of Engineering and Institute for Integrated Cell Materials Sciences (WPI-iCeMS), Kyoto University, Nishikyo-Ku, Kyoto, 615-8510 Japan
| | - Seigo Ito
- Department of Materials and Synchrotron Radiation Engineering, Graduate School of Engineering, University of Hyogo, 2167 Shosha, Himeji, Hyogo 671-2280 Japan
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19
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Umeyama T, Shibata S, Igarashi K, Takahara S, Higashino T, Seki S, Imahori H. Enantiomerically Separated α-[70]PCBM for Organic Photovoltaics. CHEM LETT 2017. [DOI: 10.1246/cl.170306] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
Affiliation(s)
- Tomokazu Umeyama
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510
| | - Sho Shibata
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510
| | - Kensho Igarashi
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510
| | - Shogo Takahara
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510
| | - Tomohiro Higashino
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510
| | - Shu Seki
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510
| | - Hiroshi Imahori
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Sakyo-ku, Kyoto 606-8501
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20
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Umeyama T, Shibata S, Miyata T, Igarashi K, Koganezawa T, Imahori H. Regioisomer effects of [70]PCBM on film structures and photovoltaic properties of composite films with a crystalline conjugated polymer P3HT. RSC Adv 2017. [DOI: 10.1039/c7ra08618k] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The β-isomer of [70]PCBM induced a face-on P3HT packing, resulting in the superior hole mobility and photovoltaic properties.
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Affiliation(s)
- Tomokazu Umeyama
- Department of Molecular Engineering
- Graduate School of Engineering
- Kyoto University
- Kyoto 615-8510
- Japan
| | - Sho Shibata
- Department of Molecular Engineering
- Graduate School of Engineering
- Kyoto University
- Kyoto 615-8510
- Japan
| | - Tetsushi Miyata
- Department of Molecular Engineering
- Graduate School of Engineering
- Kyoto University
- Kyoto 615-8510
- Japan
| | - Kensho Igarashi
- Department of Molecular Engineering
- Graduate School of Engineering
- Kyoto University
- Kyoto 615-8510
- Japan
| | | | - Hiroshi Imahori
- Department of Molecular Engineering
- Graduate School of Engineering
- Kyoto University
- Kyoto 615-8510
- Japan
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21
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Umeyama T, Baek J, Mihara J, Tkachenko NV, Imahori H. Occurrence of photoinduced charge separation by the modulation of the electronic coupling between pyrene dimers and chemically converted graphenes. Chem Commun (Camb) 2017; 53:1025-1028. [DOI: 10.1039/c6cc07985g] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The photoexcitation of the pyrene dimer on graphene resulted in the final formation of a charge-separated (CS) state following an exciplex formation, while that of the pyrene monomer on graphene generated the corresponding exciplex solely.
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Affiliation(s)
- Tomokazu Umeyama
- Department of Molecular Engineering
- Graduate School of Engineering
- Kyoto University
- Nishikyo-ku
- Japan
| | - Jinseok Baek
- Department of Molecular Engineering
- Graduate School of Engineering
- Kyoto University
- Nishikyo-ku
- Japan
| | - Junya Mihara
- Department of Molecular Engineering
- Graduate School of Engineering
- Kyoto University
- Nishikyo-ku
- Japan
| | - Nikolai V. Tkachenko
- Department of Chemistry and Bioengineering
- Tampere University of Technology
- P.O. Box 541
- FIN-33101 Tampere
- Finland
| | - Hiroshi Imahori
- Department of Molecular Engineering
- Graduate School of Engineering
- Kyoto University
- Nishikyo-ku
- Japan
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22
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Umeyama T, Imahori H. A chemical approach to perovskite solar cells: control of electron-transporting mesoporous TiO2and utilization of nanocarbon materials. Dalton Trans 2017; 46:15615-15627. [DOI: 10.1039/c7dt02421e] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
This Perspective highlights recent chemical approaches to perovskite solar cells, including the control of electron-transporting mesoporous TiO2and the utilization of nanocarbon materials.
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Affiliation(s)
- Tomokazu Umeyama
- Department of Molecular Engineering
- Graduate School of Engineering
- Kyoto University
- Kyoto 615-8510
- Japan
| | - Hiroshi Imahori
- Department of Molecular Engineering
- Graduate School of Engineering
- Kyoto University
- Kyoto 615-8510
- Japan
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23
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Kanda H, Uzum A, Nishino H, Umeyama T, Imahori H, Ishikawa Y, Uraoka Y, Ito S. Interface Optoelectronics Engineering for Mechanically Stacked Tandem Solar Cells Based on Perovskite and Silicon. ACS Appl Mater Interfaces 2016; 8:33553-33561. [PMID: 27797474 DOI: 10.1021/acsami.6b07781] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Engineering of photonics for antireflection and electronics for extraction of the hole using 2.5 nm of a thin Au layer have been performed for two- and four-terminal tandem solar cells using CH3NH3PbI3 perovskite (top cell) and p-type single crystal silicon (c-Si) (bottom cell) by mechanically stacking. Highly transparent connection multilayers of evaporated-Au and sputtered-ITO films were fabricated at the interface to be a point-contact tunneling junction between the rough perovskite and flat silicon solar cells. The mechanically stacked tandem solar cell with an optimized tunneling junction structure was ⟨perovskite for the top cell/Au (2.5 nm)/ITO (154 nm) stacked-on ITO (108 nm)/c-Si for the bottom cell⟩. It was confirmed the best efficiency of 13.7% and 14.4% as two- and four-terminal devices, respectively.
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Affiliation(s)
- Hiroyuki Kanda
- Department of Materials Science and Synchrotron Radiation Engineering, Graduate School of Engineering, University of Hyogo , 2167 Shosha, Himeji, Hyogo 671-2280, Japan
| | - Abdullah Uzum
- Department of Materials Science and Synchrotron Radiation Engineering, Graduate School of Engineering, University of Hyogo , 2167 Shosha, Himeji, Hyogo 671-2280, Japan
- Department of Electrical Electronics Engineering, Karadeniz Technical University , 61080, Trabzon, Turkey
| | - Hitoshi Nishino
- Energy Technology Laboratories, Osaka Gas Co., Ltd. , 6-19-9 Konohana-Ku, Osaka 554-0051, Japan
| | - Tomokazu Umeyama
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University , Nishikyo-ku, Kyoto 615-8510, Japan
| | - Hiroshi Imahori
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University , Nishikyo-ku, Kyoto 615-8510, Japan
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University , Nishikyo-ku, Kyoto 615-8510, Japan
| | - Yasuaki Ishikawa
- Information Device Science Laboratory, Graduate School of Materials Science, Nara Institute of Science and Technology , 8916-5 Takayama, Ikoma, Nara 630-0192, Japan
| | - Yukiharu Uraoka
- Information Device Science Laboratory, Graduate School of Materials Science, Nara Institute of Science and Technology , 8916-5 Takayama, Ikoma, Nara 630-0192, Japan
| | - Seigo Ito
- Department of Materials Science and Synchrotron Radiation Engineering, Graduate School of Engineering, University of Hyogo , 2167 Shosha, Himeji, Hyogo 671-2280, Japan
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24
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Umeyama T, Miyata T, Jakowetz AC, Shibata S, Kurotobi K, Higashino T, Koganezawa T, Tsujimoto M, Gélinas S, Matsuda W, Seki S, Friend RH, Imahori H. Regioisomer effects of [70]fullerene mono-adduct acceptors in bulk heterojunction polymer solar cells. Chem Sci 2016; 8:181-188. [PMID: 28451164 PMCID: PMC5308288 DOI: 10.1039/c6sc02950g] [Citation(s) in RCA: 47] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2016] [Accepted: 08/06/2016] [Indexed: 01/05/2023] Open
Abstract
Regioisomer separations of [70]fullerene mono-adducts for polymer solar cell (PSC) applications were conducted for the first time.
Despite numerous organic semiconductors being developed during the past decade, C70 derivatives are predominantly used as electron acceptors in efficient polymer solar cells (PSCs). However, as-prepared C70 mono-adducts intrinsically comprise regioisomers that would mask individual device performances depending on the substituent position on C70. Herein, we separate the regioisomers of C70 mono-adducts for PSC applications for the first time. Systematic investigations of the substituent position effect using a novel symmetric C70 mono-adduct ([70]NCMA) and a prevalent, high-performance one ([70]PCBM) reveals that we can control the structures of the blend films with conjugated polymers and thereby improve the PSC performances by regioisomer separation. Our approach demonstrates the significance of exploring the best-matching regioisomer of C70 mono-adducts with high-performance conjugated polymers, which would achieve a remarkable progress in PSC devices.
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Affiliation(s)
- Tomokazu Umeyama
- Department of Molecular Engineering , Graduate School of Engineering , Kyoto University , Nishikyo-ku , Kyoto , 615-8510 , Japan .
| | - Tetsushi Miyata
- Department of Molecular Engineering , Graduate School of Engineering , Kyoto University , Nishikyo-ku , Kyoto , 615-8510 , Japan .
| | - Andreas C Jakowetz
- Cavendish Laboratory , University of Cambridge , J J Thomson Avenue , Cambridge , CB3 0HE , UK .
| | - Sho Shibata
- Department of Molecular Engineering , Graduate School of Engineering , Kyoto University , Nishikyo-ku , Kyoto , 615-8510 , Japan .
| | - Kei Kurotobi
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS) , Kyoto University , Nishikyo-ku , Kyoto 615-8510 , Japan
| | - Tomohiro Higashino
- Department of Molecular Engineering , Graduate School of Engineering , Kyoto University , Nishikyo-ku , Kyoto , 615-8510 , Japan .
| | - Tomoyuki Koganezawa
- Japan Synchrotron Radiation Research Institute , 1-1-1, Kouto, Sayo-cho, Sayo-gun , Hyogo 679-5198 , Japan
| | - Masahiko Tsujimoto
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS) , Kyoto University , Nishikyo-ku , Kyoto 615-8510 , Japan
| | - Simon Gélinas
- Cavendish Laboratory , University of Cambridge , J J Thomson Avenue , Cambridge , CB3 0HE , UK .
| | - Wakana Matsuda
- Department of Molecular Engineering , Graduate School of Engineering , Kyoto University , Nishikyo-ku , Kyoto , 615-8510 , Japan .
| | - Shu Seki
- Department of Molecular Engineering , Graduate School of Engineering , Kyoto University , Nishikyo-ku , Kyoto , 615-8510 , Japan .
| | - Richard H Friend
- Cavendish Laboratory , University of Cambridge , J J Thomson Avenue , Cambridge , CB3 0HE , UK .
| | - Hiroshi Imahori
- Department of Molecular Engineering , Graduate School of Engineering , Kyoto University , Nishikyo-ku , Kyoto , 615-8510 , Japan . .,Institute for Integrated Cell-Material Sciences (WPI-iCeMS) , Kyoto University , Nishikyo-ku , Kyoto 615-8510 , Japan
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25
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Miura T, Tao R, Shibata S, Umeyama T, Tachikawa T, Imahori H, Kobori Y. Geometries, Electronic Couplings, and Hole Dissociation Dynamics of Photoinduced Electron–Hole Pairs in Polyhexylthiophene–Fullerene Dyads Rigidly Linked by Oligophenylenes. J Am Chem Soc 2016; 138:5879-85. [DOI: 10.1021/jacs.5b13414] [Citation(s) in RCA: 35] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Taku Miura
- Department
of Chemistry, Graduate School of Science, Kobe University, 1-1
Rokkodaicho, Nada-ku, Kobe 657-8501, Japan
| | - Ran Tao
- Department
of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Sho Shibata
- Department
of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Tomokazu Umeyama
- Department
of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Takashi Tachikawa
- Department
of Chemistry, Graduate School of Science, Kobe University, 1-1
Rokkodaicho, Nada-ku, Kobe 657-8501, Japan
| | - Hiroshi Imahori
- Department
of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
- Institute
for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Yasuhiro Kobori
- Department
of Chemistry, Graduate School of Science, Kobe University, 1-1
Rokkodaicho, Nada-ku, Kobe 657-8501, Japan
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26
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Umeyama T, Shibata S, Imahori H. Blend films of an amorphous conjugated polymer and a thermal precursor fullerene: effects of annealing temperatures on film structures and photovoltaic properties. RSC Adv 2016. [DOI: 10.1039/c6ra18223b] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
Thermal precursor approach using C60–9-methylanthracene adducts enables blend film formations with bulk heterojunction structures containing highly aggregating pristine C60 molecules in combination with an amorphous conjugated polymer, PCDTBT.
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Affiliation(s)
- Tomokazu Umeyama
- Department of Molecular Engineering
- Graduate School of Engineering
- Kyoto University
- Kyoto
- Japan
| | - Sho Shibata
- Department of Molecular Engineering
- Graduate School of Engineering
- Kyoto University
- Kyoto
- Japan
| | - Hiroshi Imahori
- Department of Molecular Engineering
- Graduate School of Engineering
- Kyoto University
- Kyoto
- Japan
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27
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Umeyama T, Matano D, Baek J, Gupta S, Ito S, Subramanian V(R, Imahori H. Boosting of the Performance of Perovskite Solar Cells through Systematic Introduction of Reduced Graphene Oxide in TiO2Layers. CHEM LETT 2015. [DOI: 10.1246/cl.150651] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
Affiliation(s)
- Tomokazu Umeyama
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University
| | - Daichi Matano
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University
| | - Jinseok Baek
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University
| | - Satyajit Gupta
- Department of Chemical and Materials Engineering, University of Nevada
| | - Seigo Ito
- Department of Electrical Engineering and Computer Sciences, Graduate School of Engineering, University of Hyogo
| | | | - Hiroshi Imahori
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University
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28
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Tao R, Umeyama T, Higashino T, Koganezawa T, Imahori H. Synthesis and Isolation of cis-2 Regiospecific Ethylene-Tethered Indene Dimer-[70]Fullerene Adduct for Polymer Solar Cell Applications. ACS Appl Mater Interfaces 2015; 7:16676-16685. [PMID: 26177008 DOI: 10.1021/acsami.5b04351] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Although the utilization of [70]fullerene bis-adducts can enhance the power conversion efficiencies of polymer solar cells (PSCs) owing to their strong absorption intensities and high-lying lowest unoccupied molecular orbital energy levels, this synthetic strategy typically yields a mixture of regioisomers that would mask the intrinsic device performances depending on the substituent pattern on the [70]fullerene derivatives. In this study, a single cis-2 regioisomer of C70 bis-adduct (cis-2-[70]BIEC) has been prepared for the first time by the same strategy that had been applied to [60]fullerene to obtain a regioisomerically pure C60 bis-adduct (cis-2-[60]BIEC). Diels-Alder reaction was conducted between a rationally designed ethylene-tethered indene dimer and [70]fullerene, followed by isolation using high-performance liquid chromatography suitable for the separation of fullerene derivatives. A series of structural analysis techniques including NMR spectroscopies and X-ray crystallography were used to identify the absolute configuration of the bis-adduct. A systematic study on the optical, electrochemical, and photovoltaic properties of cis-2-[70]BIEC as well as the corresponding regioisomer mixture (bis-[70]BIEC) and the monoadduct (α-mono-[70]BIEC) has been performed to examine the effect of the pure cis-2 regioisomer. More importantly, their properties are compared with those of cis-2-[60]BIEC to address the effect of fullerene cage structures, that is, C60 versus C70. The PSC based on cis-2-[70]BIEC and poly(3-hexylthiophene) showed a remarkable power conversion efficiency of 4.2%, which is higher than those with bis-[70]BIEC (2.2%), α-mono-[70]BIEC (2.2%), cis-2-[60]BIEC (2.8%), and even a prevalent high-performance C70 monoadduct ([70]PCBM, 3.8%). Our synthetic strategy will pave the way for further development on the rational design and isolation of single fullerene bis-adduct regioisomers exhibiting high device performances.
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Affiliation(s)
| | | | | | - Tomoyuki Koganezawa
- §Japan Synchrotron Radiation Research Institute, 1-1-1, Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan
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29
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Umeyama T, Watanabe Y, Miyata T, Imahori H. Electron-rich Five-membered Ring of Azulene as a Donor Unit in Donor–Acceptor Alternating Copolymers for Polymer Solar Cell Applications. CHEM LETT 2015. [DOI: 10.1246/cl.140904] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Tomokazu Umeyama
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University
| | - Yusuke Watanabe
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University
| | - Tetsushi Miyata
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University
| | - Hiroshi Imahori
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University
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30
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Tao R, Umeyama T, Higashino T, Koganezawa T, Imahori H. A single cis-2 regioisomer of ethylene-tethered indene dimer–fullerene adduct as an electron-acceptor in polymer solar cells. Chem Commun (Camb) 2015; 51:8233-6. [DOI: 10.1039/c5cc01712b] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
A single cis-2 isomer of fullerene bis-adduct has been synthesized, isolated and applied as an electron-acceptor in polymer solar cells.
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Affiliation(s)
- Ran Tao
- Department of Molecular Engineering
- Graduate School of Engineering
- Kyoto University
- Kyoto 615-8510
- Japan
| | - Tomokazu Umeyama
- Department of Molecular Engineering
- Graduate School of Engineering
- Kyoto University
- Kyoto 615-8510
- Japan
| | - Tomohiro Higashino
- Department of Molecular Engineering
- Graduate School of Engineering
- Kyoto University
- Kyoto 615-8510
- Japan
| | | | - Hiroshi Imahori
- Department of Molecular Engineering
- Graduate School of Engineering
- Kyoto University
- Kyoto 615-8510
- Japan
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31
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Umeyama T, Watanabe Y, Miyata T, Imahori H. Synthesis of Thienothiadiazole–Benzothiadiazole Alternating Copolymers and Their Application to Bulk Heterojunction Solar Cells. CHEM LETT 2014. [DOI: 10.1246/cl.140822] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Tomokazu Umeyama
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University
| | - Yusuke Watanabe
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University
| | - Tetsushi Miyata
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University
| | - Hiroshi Imahori
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University
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32
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Tao R, Umeyama T, Kurotobi K, Imahori H. Effects of alkyl chain length and substituent pattern of fullerene bis-adducts on film structures and photovoltaic properties of bulk heterojunction solar cells. ACS Appl Mater Interfaces 2014; 6:17313-17322. [PMID: 25208339 DOI: 10.1021/am5058794] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
A series of alkoxycarbonyl-substituted dihydronaphthyl-based [60]fullerene bis-adduct derivatives (denoted as C2BA, C4BA, and C6BA with the alkyl chain of ethyl, n-butyl, and n-hexyl, respectively) have been synthesized to investigate the effects of alkyl chain length and substituent pattern of fullerene bis-adducts on the film structures and photovoltaic properties of bulk heterojunction polymer solar cells. The shorter alkyl chain length caused lower solubility of the fullerene bis-adducts (C6BA > C4BA > C2BA), thereby resulting in the increased separation difficulty of respective bis-adduct isomers. The device performance based on poly(3-hexylthiophene) (P3HT) and the fullerene bis-adduct regioisomer mixtures was enhanced by shortening the alkyl chain length. When using the regioisomerically separated fullerene bis-adducts, the devices based on trans-2 and a mixture of trans-4 and e of C4BA exhibited the highest power conversion efficiencies of ca. 2.4%, which are considerably higher than those of the C6BA counterparts (ca. 1.4%) and the C4BA regioisomer mixture (1.10%). The film morphologies as well as electron mobilities of the P3HT:bis-adduct blend films were found to affect the photovoltaic properties considerably. These results reveal that the alkyl chain length and substituent pattern of fullerene bis-adducts significantly influence the photovoltaic properties as well as the film structures of bulk heterojunction solar cells.
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Affiliation(s)
- Ran Tao
- Department of Molecular Engineering, Graduate School of Engineering, and ‡Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University , Nishikyo-ku, Kyoto 615-8510, Japan
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33
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Oh-oka H, Yamada T, Noto H, Umeyama T, Kadekawa K, Ashitomi K, Nishijima S, Sugaya K. Effect of carbazochrome sodium sulfonate on refractory chronic prostatitis. Int J Urol 2014; 21:1162-6. [DOI: 10.1111/iju.12533] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/22/2014] [Accepted: 05/18/2014] [Indexed: 11/29/2022]
Affiliation(s)
- Hitoshi Oh-oka
- Department of Urology; National Hospital Organization; Kobe Medical Center; Kobe Hyogo
| | | | | | | | - Katsumi Kadekawa
- Southern Knights' Laboratory LLP; Okinawa
- Department of Urology; Okinawa Kyodo Hospital; Naha
| | - Katsuhiro Ashitomi
- Southern Knights' Laboratory LLP; Okinawa
- Department of Urology; Okinawa Hokubu Hospital; Nago
| | | | - Kimio Sugaya
- Southern Knights' Laboratory LLP; Okinawa
- Department of Urology; Kitakami Central Hospital; Chatan Okinawa Japan
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34
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Zhou S, Hashida Y, Kawakami S, Mihara J, Umeyama T, Imahori H, Murakami T, Yamashita F, Hashida M. Preparation of immunostimulatory single-walled carbon nanotube/CpG DNA complexes and evaluation of their potential in cancer immunotherapy. Int J Pharm 2014; 471:214-23. [PMID: 24861942 DOI: 10.1016/j.ijpharm.2014.05.037] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2014] [Revised: 04/30/2014] [Accepted: 05/19/2014] [Indexed: 01/10/2023]
Abstract
Carbon nanotubes (CNTs) have many interesting properties. In particular, their photohyperthermic effect by near-infrared (NIR) irradiation could be used to kill cancer cells, and could thus be applied in photohyperthermic therapy. However, the solubility of CNTs must be improved before they can be used in biological applications. As DNA is reported to disperse the CNTs in aqueous solution with π-π interactions, we hypothesis that immunostimulatory CpG DNA may also disperse the CNTs in aqueous solution. In this study, we used CpG DNA to disperse single-walled CNTs (SWCNTs) in aqueous solution, in order to combine photohyperthermic effect and immunoactivation together to achieve a more effective cancer therapy. As expected, CpG DNA effectively dispersed the SWCNTs in aqueous solution via the formation of SWCNT/CpG DNA complexes. Moreover, the immunoreactivity of the SWCNT/CpG DNA complexes was investigated. The results showed that intratumoral administration of the SWCNT/CpG DNA complexes in mice enhanced the production level of inflammatory cytokines in tumor tissues. Finally, we evaluated the antitumor effects of the SWCNT/CpG DNA complexes in tumor-bearing mice. The result indicated that intratumoral administration of the SWCNT/CpG DNA complexes combined with NIR irradiation was a more effective approach to prevent the proliferation of tumor growth.
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Affiliation(s)
- Shuwen Zhou
- Department of Drug Delivery Research, Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan; The Japan Society for the Promotion of Science (JSPS), Chiyoda-ku, Tokyo 102-8471, Japan
| | - Yasuhiko Hashida
- Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| | - Shigeru Kawakami
- Department of Drug Delivery Research, Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| | - Junya Mihara
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Tomokazu Umeyama
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Hiroshi Imahori
- Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan; Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Tatsuya Murakami
- Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| | - Fumiyoshi Yamashita
- Department of Drug Delivery Research, Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan
| | - Mitsuru Hashida
- Department of Drug Delivery Research, Graduate School of Pharmaceutical Sciences, Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan; Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University, Sakyo-ku, Kyoto 606-8501, Japan.
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35
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Hashida Y, Tanaka H, Zhou S, Kawakami S, Yamashita F, Murakami T, Umeyama T, Imahori H, Hashida M. Photothermal ablation of tumor cells using a single-walled carbon nanotube-peptide composite. J Control Release 2013; 173:59-66. [PMID: 24211651 DOI: 10.1016/j.jconrel.2013.10.039] [Citation(s) in RCA: 88] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2013] [Revised: 10/28/2013] [Accepted: 10/30/2013] [Indexed: 11/15/2022]
Abstract
Single-walled carbon nanotubes (SWCNTs) are known to have great potential for biomedical applications such as photothermal ablation of tumor cells in combination with near-infrared (NIR) irradiation. In this study, the photothermal activity of a novel SWCNTs composite with a designed peptide having a repeated structure of H-(-Lys-Phe-Lys-Ala-)7-OH [(KFKA)7] against tumor cells was evaluated in vitro and in vivo. The SWCNT-(KFKA)7 composite demonstrated high aqueous dispersibility that enabled SWCNTs to be used in tumor ablation. The NIR irradiation of SWCNT-(KFKA)7 solution resulted in a rapid temperature increase dependent on the SWCNTs concentration up to 50μg/ml. Three minutes of NIR irradiation of a colon 26 or HepG2 cell culture incubated with SWCNT-(KFKA)7 resulted in remarkable cell damage, while that by single treatment with SWCNT-(KFKA)7 or NIR irradiation alone was moderate. The intratumoral injection of SWCNT-(KFKA)7 solution followed by NIR irradiation resulted in a rapid increase of the temperature to 43°C in the subcutaneously inoculated colon 26 tumor based on thermographic observation and remarkable suppression of tumor growth compared with treatment with only SWCNT-(KFKA)7 injection alone or NIR irradiation alone. These results suggest the a great potential of an SWCNT-peptide composite for use in photothermal cancer therapy.
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Affiliation(s)
- Yasuhiko Hashida
- Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University, Kyoto, Japan
| | - Hironori Tanaka
- Department of Drug Delivery Research, Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto, Japan
| | - Shuwen Zhou
- Department of Drug Delivery Research, Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto, Japan
| | - Shigeru Kawakami
- Department of Drug Delivery Research, Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto, Japan
| | - Fumiyoshi Yamashita
- Department of Drug Delivery Research, Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto, Japan
| | - Tatsuya Murakami
- Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University, Kyoto, Japan
| | - Tomokazu Umeyama
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyoto, Japan
| | - Hiroshi Imahori
- Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University, Kyoto, Japan; Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Kyoto, Japan
| | - Mitsuru Hashida
- Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University, Kyoto, Japan; Department of Drug Delivery Research, Graduate School of Pharmaceutical Sciences, Kyoto University, Kyoto, Japan.
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36
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Matano Y, Ohkubo H, Miyata T, Watanabe Y, Hayashi Y, Umeyama T, Imahori H. Phosphole- and Benzodithiophene-Based Copolymers: Synthesis and Application in Organic Photovoltaics. Eur J Inorg Chem 2013. [DOI: 10.1002/ejic.201301132] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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37
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Murakami T, Nakatsuji H, Inada M, Matoba Y, Umeyama T, Tsujimoto M, Isoda S, Hashida M, Imahori H. Photodynamic and Photothermal Effects of Semiconducting and Metallic-Enriched Single-Walled Carbon Nanotubes. J Am Chem Soc 2012; 134:17862-5. [DOI: 10.1021/ja3079972] [Citation(s) in RCA: 150] [Impact Index Per Article: 12.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/27/2022]
Affiliation(s)
| | - Hirotaka Nakatsuji
- Department of Molecular Engineering,
Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Mami Inada
- Department of Molecular Engineering,
Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Yoshinori Matoba
- Department of Molecular Engineering,
Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Tomokazu Umeyama
- Department of Molecular Engineering,
Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
- PRESTO, Japan Science and Technology Agency,
Kawaguchi, Saitama 332-0012,
Japan
| | | | | | | | - Hiroshi Imahori
- Department of Molecular Engineering,
Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
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38
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Hashida Y, Umeyama T, Mihara J, Imahori H, Tsujimoto M, Isoda S, Takano M, Hashida M. Development of a Novel Composite Material with Carbon Nanotubes Assisted by Self-Assembled Peptides Designed in Conjunction with β-Sheet Formation. J Pharm Sci 2012; 101:3398-412. [DOI: 10.1002/jps.23144] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/19/2012] [Revised: 03/11/2012] [Accepted: 03/15/2012] [Indexed: 11/06/2022]
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39
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Affiliation(s)
- Tomokazu Umeyama
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University
- PRESTO, Japan Science and Technology Agency (JST)
| | - Evgenia Douvogianni
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University
| | - Hiroshi Imahori
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University
- Fukui Institute for Fundamental Chemistry, Kyoto University
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40
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Imahori H, Umeyama T, Kurotobi K, Takano Y. Self-assembling porphyrins and phthalocyanines for photoinduced charge separation and charge transport. Chem Commun (Camb) 2012; 48:4032-45. [PMID: 22430327 DOI: 10.1039/c2cc30621b] [Citation(s) in RCA: 163] [Impact Index Per Article: 13.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Large π-conjugated compounds are promising building blocks for organic thin-film electronics such as organic light-emitting diodes, organic field-effect transistors, and organic photovoltaics. Utilization of porphyrins and phthalocyanines for this purpose is highly fascinating because of their excellent electric, photophysical, and electrochemical properties as well as intense self-assembling abilities arising from π-π stacking interactions. This paper focuses on fundamental aspects of self-assembled structures that have been obtained from porphyrin and phthalocyanine building blocks and more complex composites for photoinduced charge separation and charge transport toward the potential applications to organic thin-film electronics.
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Affiliation(s)
- Hiroshi Imahori
- Institute for Integrated Cell-Material Sciences (WPI-iCeMS), Kyoto University, Kyoto 615-8510, Japan.
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41
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Umeyama T, Mihara J, Tezuka N, Matano Y, Stranius K, Chukharev V, Tkachenko NV, Lemmetyinen H, Noda K, Matsushige K, Shishido T, Liu Z, Hirose-Takai K, Suenaga K, Imahori H. Preparation and Photophysical and Photoelectrochemical Properties of a Covalently Fixed Porphyrin-Chemically Converted Graphene Composite. Chemistry 2012; 18:4250-7. [DOI: 10.1002/chem.201103843] [Citation(s) in RCA: 52] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2011] [Indexed: 11/11/2022]
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Abstract
This mini review presents our recent developments in porphyrin-modified electrodes for solar energy conversion. Various porphyrins have been assembled on nanostructured semiconducting electrodes to achieve efficient photocurrent generation. First, porphyrins have been organized with fullerenes onto semiconducting electrodes to elucidate the relationship between the molecular structures, film structures, and photoelectrochemical properties of the modified electrodes. Formation of hole and electron-transporting highways in the porphyrin/fullerene composite film led to the remarkable enhancement of photocurrent generation. Second, porphyrin-modified single-walled carbon nanotubes have also been assembled onto semiconducting electrodes. The degree of chemical functionalization by the bulky porphyrins was found to have a large impact on the photoelectrochemical properties. Third, asymmetrically π-elongated porphyrins have been successfully employed in dye-sensitized solar cells to improve the cell performance as well as the light-harvesting properties. The power conversion efficiency of the fused porphyrin cell was improved by 50% compared to the reference cell using the corresponding unfused porphyrin. Finally, carboxyquinoxalino derivatives of zinc porphyrin have been further developed to extend the concept of asymmetrically π-elongated porphyrins. The maximum power conversion efficiency of 5.2% was obtained by using 5,10,15,20-tetrakis(2,4,6-trimethylphenyl)-6′-carboxyquinoxalino[2,3-b]porphyrinatozinc(II).
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Affiliation(s)
- Hiroshi Imahori
- Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
- Fukui Institute for Fundamental Chemistry, Kyoto University, 34-4, Takano-Nishihiraki-cho, Sakyo-ku, Kyoto 606-8103, Japan
| | - Tomokazu Umeyama
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
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Kitaura S, Kurotobi K, Sato M, Takano Y, Umeyama T, Imahori H. Effects of dihydronaphthyl-based [60]fullerene bisadduct regioisomers on polymer solar cell performance. Chem Commun (Camb) 2012; 48:8550-2. [DOI: 10.1039/c2cc34078j] [Citation(s) in RCA: 66] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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44
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Umeyama T, Watanabe Y, Oodoi M, Evgenia D, Shishido T, Imahori H. Synthesis of low bandgap polymers based on thienoquinodimethane units and their applications in bulk heterojunction solar cells. ACTA ACUST UNITED AC 2012. [DOI: 10.1039/c2jm33637e] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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45
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Umeyama T, Fueno H, Kawabata E, Kobayashi Y, Tanaka K, Tezuka N, Matano Y, Imahori H. Density Functional Theory Studies on Chemical Functionalization of Single-Walled Carbon Nanotubes by Bingel Reaction. BCSJ 2011. [DOI: 10.1246/bcsj.20100326] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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46
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Hayashi H, Nihashi W, Umeyama T, Matano Y, Seki S, Shimizu Y, Imahori H. Segregated donor-acceptor columns in liquid crystals that exhibit highly efficient ambipolar charge transport. J Am Chem Soc 2011; 133:10736-9. [PMID: 21699188 DOI: 10.1021/ja203822q] [Citation(s) in RCA: 112] [Impact Index Per Article: 8.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/29/2023]
Abstract
Liquid crystalline donor (i.e., phthalocyanine) was covalently linked to acceptor (i.e, fullerene) to achieve efficient charge-transport properties in a liquid crystalline phase. The columnar structure exhibited highly efficient ambipolar charge-transport character, demonstrating the potential utility of the strategy in organic electronics.
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Affiliation(s)
- Hironobu Hayashi
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
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47
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Imahori H, Iijima H, Hayashi H, Toude Y, Umeyama T, Matano Y, Ito S. Bisquinoxaline-fused porphyrins for dye-sensitized solar cells. ChemSusChem 2011; 4:797-805. [PMID: 21591269 DOI: 10.1002/cssc.201100029] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2011] [Indexed: 05/30/2023]
Abstract
5,10,15,20-Tetrakis(2,4,6-trimethylphenyl)-6'-carboxylquinoxalino[2,3-b]quinoxalino[12,13-b']porphyrinatozinc(II) (ZnPBQ) is synthesized to evaluate the effects of π elongation of quinoxaline-fused porphyrins on the optical, electrochemical, and photovoltaic properties. ZnPBQ showed an intensified Soret band as well as red-shifted Soret and Q bands relative to 5,10,15,20-tetrakis(2,4,6-trimethylphenyl)-6'-carboxylquinoxalino[2,3-b]porphyrinatozinc(II) (ZnPQ), demonstrating the improved light-harvesting property of ZnPBQ. The optical and electrochemical HOMO-LUMO gaps were consistent with those estimated by DFT calculations. The photovoltaic properties were compared under optimized conditions, in which a sealed device structure with TiCl(4) -treated, TiO(2) double layers was used. The ZnPBQ cell exhibited a relatively high power conversion efficiency (η) of 4.7%, which was smaller than that of the ZnPQ cell (η=6.3%). The weaker electronic coupling between the LUMO of ZnPBQ and conduction band (CB) of TiO(2) or more tilted geometry of ZnPBQ on the TiO(2) surface may result in the low electron injection/charge collection efficiency as well as the low incident photon-to-current efficiency (IPCE) for the ZnPBQ cell (maximum IPCE=56%) relative to the ZnPQ cell (maximum IPCE=75%), leading to the lower η value of the ZnPBQ cell than that of the ZnPQ cell. In addition, the open-circuit potential of the ZnPBQ cell also slightly decreased with the effect of charge recombination from the electrons injected into the CB of TiO(2) to I(3)(-).
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Affiliation(s)
- Hiroshi Imahori
- Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University, Kyoto 615-8510, Japan.
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48
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Hayashi H, Lightcap IV, Tsujimoto M, Takano M, Umeyama T, Kamat PV, Imahori H. Electron Transfer Cascade by Organic/Inorganic Ternary Composites of Porphyrin, Zinc Oxide Nanoparticles, and Reduced Graphene Oxide on a Tin Oxide Electrode that Exhibits Efficient Photocurrent Generation. J Am Chem Soc 2011; 133:7684-7. [DOI: 10.1021/ja201813n] [Citation(s) in RCA: 124] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/21/2023]
Affiliation(s)
- Hironobu Hayashi
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Ian V. Lightcap
- Radiation Laboratory, Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Masahiko Tsujimoto
- Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Mikio Takano
- Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Tomokazu Umeyama
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
| | - Prashant V. Kamat
- Radiation Laboratory, Department of Chemistry and Biochemistry, University of Notre Dame, Notre Dame, Indiana 46556, United States
| | - Hiroshi Imahori
- Department of Molecular Engineering, Graduate School of Engineering, Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
- Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University, Nishikyo-ku, Kyoto 615-8510, Japan
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Umeyama T, Tezuka N, Kawashima F, Seki S, Matano Y, Nakao Y, Shishido T, Nishi M, Hirao K, Lehtivuori H, Tkachenko NV, Lemmetyinen H, Imahori H. Carbon Nanotube Wiring of Donor-Acceptor Nanograins by Self-Assembly and Efficient Charge Transport. Angew Chem Int Ed Engl 2011. [DOI: 10.1002/ange.201007065] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
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50
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Umeyama T, Tezuka N, Kawashima F, Seki S, Matano Y, Nakao Y, Shishido T, Nishi M, Hirao K, Lehtivuori H, Tkachenko NV, Lemmetyinen H, Imahori H. Carbon Nanotube Wiring of Donor-Acceptor Nanograins by Self-Assembly and Efficient Charge Transport. Angew Chem Int Ed Engl 2011; 50:4615-9. [DOI: 10.1002/anie.201007065] [Citation(s) in RCA: 32] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/10/2010] [Indexed: 11/08/2022]
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