1
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Ryu H, Hong SC, Kim K, Jung Y, Lee Y, Lee K, Kim Y, Kim H, Watanabe K, Taniguchi T, Kim J, Kim K, Cheong H, Lee GH. Optical grade transformation of monolayer transition metal dichalcogenides via encapsulation annealing. NANOSCALE 2024. [PMID: 38439548 DOI: 10.1039/d3nr06641j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 03/06/2024]
Abstract
Monolayer transition metal dichalcogenides (TMDs) have emerged as highly promising candidates for optoelectronic applications due to their direct band gap and strong light-matter interactions. However, exfoliated TMDs have demonstrated optical characteristics that fall short of expectations, primarily because of significant defects and associated doping in the synthesized TMD crystals. Here, we report the improvement of optical properties in monolayer TMDs of MoS2, MoSe2, WS2, and WSe2, by hBN-encapsulation annealing. Monolayer WSe2 showed 2000% enhanced photoluminescence quantum yield (PLQY) and 1000% increased lifetime after encapsulation annealing at 1000 °C, which are attributed to dominant radiative recombination of excitons through dedoping of monolayer TMDs. Furthermore, after encapsulation annealing, the transport characteristics of monolayer WS2 changed from n-type to ambipolar, along with an enhanced hole transport, which also support dedoping of annealed TMDs. This work provides an innovative approach to elevate the optical grade of monolayer TMDs, enabling the fabrication of high-performance optoelectronic devices.
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Affiliation(s)
- Huije Ryu
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea.
| | - Seong Chul Hong
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea.
| | - Kangwon Kim
- Department of Physics, Sogang University, Seoul 04107, Republic of Korea
| | - Yeonjoon Jung
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea.
| | - Yangjin Lee
- Department of Physics, Yonsei University, Seoul 03722, Republic of Korea
- Center for Nanomedicine, Institute for Basic Science, Seoul 03722, Republic of Korea
| | - Kihyun Lee
- Department of Physics, Yonsei University, Seoul 03722, Republic of Korea
- Center for Nanomedicine, Institute for Basic Science, Seoul 03722, Republic of Korea
| | - Youngbum Kim
- Department of Energy Science, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Hyunjun Kim
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea.
| | - Kenji Watanabe
- Research Center for Electronic and Optical Materials, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
| | - Takashi Taniguchi
- Research Center for Materials Nanoarchitectonics, National Institute for Materials Science, 1-1 Namiki, Tsukuba 305-0044, Japan
| | - Jeongyong Kim
- Department of Energy Science, Sungkyunkwan University, Suwon 16419, Republic of Korea
| | - Kwanpyo Kim
- Department of Physics, Yonsei University, Seoul 03722, Republic of Korea
- Center for Nanomedicine, Institute for Basic Science, Seoul 03722, Republic of Korea
| | - Hyeonsik Cheong
- Department of Physics, Sogang University, Seoul 04107, Republic of Korea
| | - Gwan-Hyoung Lee
- Department of Materials Science and Engineering, Seoul National University, Seoul 08826, Republic of Korea.
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2
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Sasikala SP, Prabhakaran P, Baskaran S, Kim JT, Lee GS, Yoon YH, Choi HJ, Kim JG, Kim JB, Kim SO. Direct Solution-Phase Synthesis and Functionalization of 2D WSe 2 for Ambient Stability. Chemistry 2023; 29:e202301744. [PMID: 37537970 DOI: 10.1002/chem.202301744] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Revised: 08/03/2023] [Accepted: 08/03/2023] [Indexed: 08/05/2023]
Abstract
2H phase tungsten diselenide (WSe2 ) is a p-type 2D semiconductor from the transition metal dichalcogenides (TMDs) family with unique optoelectrical properties. Solution phase production of atomically thin WSe2 is challenging due to its instability under ambient conditions. We present a highly efficient and scalable solution method for simultaneously exfoliating and functionalizing WSe2 by leveraging the non-covalent interaction between mercapto-group and bulk WSe2 . Single and few-layer 2H phase pure WSe2 sheets of lateral size up to 5 μm with minimal basal plane defects, as revealed by XPS, Raman and FTIR spectroscopy, are produced in a water-ethanol mixture. Remarkably, WSe2 dispersion remains stable even at high concentrations (10 mg/mL) and exhibited high colloidal stability with a shelf-life exceeding a year. The findings from our study suggest that through precise manipulation of intercalation chemistry, mass production of solution-processable phase-sensitive 2D materials such as WSe2 can be achieved. This advancement holds great potential for facilitating their practical utilization in various real-world applications.
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Affiliation(s)
- Suchithra Padmajan Sasikala
- Materials Science and Engineering, Korea Advanced Institute of Science and Technology Daehak-ro 192, Yuseong-gu, Daejeon, 34141 (Republic of, Korea
| | - Prem Prabhakaran
- Department of Advanced Materials, Hannam University, Daejeon, 34054 (Republic of, Korea
| | - Sambath Baskaran
- Materials Science and Engineering, Korea Advanced Institute of Science and Technology Daehak-ro 192, Yuseong-gu, Daejeon, 34141 (Republic of, Korea
| | - Jun Tae Kim
- Materials Science and Engineering, Korea Advanced Institute of Science and Technology Daehak-ro 192, Yuseong-gu, Daejeon, 34141 (Republic of, Korea
| | - Gang San Lee
- Materials Science and Engineering, Korea Advanced Institute of Science and Technology Daehak-ro 192, Yuseong-gu, Daejeon, 34141 (Republic of, Korea
| | - Yeo Hoon Yoon
- Materials Science and Engineering, Korea Advanced Institute of Science and Technology Daehak-ro 192, Yuseong-gu, Daejeon, 34141 (Republic of, Korea
| | - Hee Jae Choi
- Materials Science and Engineering, Korea Advanced Institute of Science and Technology Daehak-ro 192, Yuseong-gu, Daejeon, 34141 (Republic of, Korea
| | - Jin Goo Kim
- Materials Science and Engineering, Korea Advanced Institute of Science and Technology Daehak-ro 192, Yuseong-gu, Daejeon, 34141 (Republic of, Korea
| | - Jun Beom Kim
- Materials Science and Engineering, Korea Advanced Institute of Science and Technology Daehak-ro 192, Yuseong-gu, Daejeon, 34141 (Republic of, Korea
| | - Sang Ouk Kim
- Materials Science and Engineering, Korea Advanced Institute of Science and Technology Daehak-ro 192, Yuseong-gu, Daejeon, 34141 (Republic of, Korea
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3
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Shuang Y, Chen Q, Kim M, Wang Y, Saito Y, Hatayama S, Fons P, Ando D, Kubo M, Sutou Y. NbTe 4 Phase-Change Material: Breaking the Phase-Change Temperature Balance in 2D Van der Waals Transition-Metal Binary Chalcogenide. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2303646. [PMID: 37338024 DOI: 10.1002/adma.202303646] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/19/2023] [Revised: 06/13/2023] [Indexed: 06/21/2023]
Abstract
2D van der Waals (vdW) transition metal di-chalcogenides (TMDs) have garnered significant attention in the nonvolatile memory field for their tunable electrical properties, scalability, and potential for phase engineering. However, their complex switching mechanism and complicated fabrication methods pose challenges for mass production. Sputtering is a promising technique for large-area 2D vdW TMD fabrication, but the high melting point (typically Tm > 1000 °C) of TMDs requires elevated temperatures for good crystallinity. This study focuses on the low-Tm 2D vdW TM tetra-chalcogenides and identifies NbTe4 as a promising candidate with an ultra-low Tm of around 447 °C (onset temperature). As-grown NbTe4 forms an amorphous phase upon deposition that can be crystallized by annealing at temperatures above 272 °C. The simultaneous presence of a low Tm and a high crystallization temperature Tc can resolve important issues facing current phase-change memory compounds, such as high Reset energies and poor thermal stability of the amorphous phase. Therefore, NbTe4 holds great promise as a potential solution to these issues.
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Affiliation(s)
- Yi Shuang
- WPI Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba, Sendai, 980-8577, Japan
| | - Qian Chen
- New Industry Creation Hatchery Center, Tohoku University, 6-6-10 Aoba, Aramaki, Aoba-ku, Sendai, 980-8579, Japan
- Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan
| | - Mihyeon Kim
- Department of Materials Science, Graduate School of Engineering, Tohoku University, 6-6-11 Aoba-yama, Sendai, 980-8579, Japan
| | - Yinli Wang
- Department of Materials Science, Graduate School of Engineering, Tohoku University, 6-6-11 Aoba-yama, Sendai, 980-8579, Japan
| | - Yuta Saito
- Device Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 2, Umezono 1-1-1, Tsukuba, 305-8568, Japan
| | - Shogo Hatayama
- Device Technology Research Institute, National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba Central 2, Umezono 1-1-1, Tsukuba, 305-8568, Japan
| | - Paul Fons
- Department of Electronics and Electrical Engineering, Faculty of Science and Technology, Keio University, 3-14-1 Hiyoshi, Kohoku-ku, Yokohama, Kanagawa, 223-8522, Japan
| | - Daisuke Ando
- Department of Materials Science, Graduate School of Engineering, Tohoku University, 6-6-11 Aoba-yama, Sendai, 980-8579, Japan
| | - Momoji Kubo
- New Industry Creation Hatchery Center, Tohoku University, 6-6-10 Aoba, Aramaki, Aoba-ku, Sendai, 980-8579, Japan
- Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai, 980-8577, Japan
| | - Yuji Sutou
- WPI Advanced Institute for Materials Research, Tohoku University, 2-1-1 Katahira, Aoba, Sendai, 980-8577, Japan
- Department of Materials Science, Graduate School of Engineering, Tohoku University, 6-6-11 Aoba-yama, Sendai, 980-8579, Japan
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4
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Cheng S, Zhong L, Yin J, Duan H, Xie Q, Luo W, Jie W. Controllable digital and analog resistive switching behavior of 2D layered WSe 2 nanosheets for neuromorphic computing. NANOSCALE 2023; 15:4801-4808. [PMID: 36779310 DOI: 10.1039/d2nr06580k] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Memristors with controllable resistive switching (RS) behavior have been considered as promising candidates for synaptic devices in next-generation neuromorphic computing. In this work, two-terminal memristors with controllable digital and analog RS behavior are fabricated based on two-dimensional (2D) WSe2 nanosheets. Under a relatively high operating voltage of 4 V, the memristor demonstrates stable and reliable non-volatile bipolar digital RS with a high switching ratio of 6.3 × 104. On the other hand, under a relatively low operation voltage, the memristor exhibits analog RS with a series of tunable resistance states. The fabricated memristors can work as an artificial synapse with fundamental synaptic functions, such as long-term potentiation (LTP) and depression (LTD) as well as paired-pulse facilitation (PPF). More importantly, the memristor demonstrates high conductance modulation linearity with the calculated nonlinear parameter for conductance as -0.82 in the LTP process, which is beneficial to improving the accuracy of neuromorphic computing. Furthermore, the neuromorphic computing of file types and image recognition can be emulated based on a constructed three-layer artificial neural network (ANN) with a recognition accuracy that can reach up to 95.9% for small digits. In addition, memristors can be used to emulate the learning-forgetting experience of the human brain. Consequently, the memristor based on 2D WSe2 nanosheets not only exhibits controllable RS behavior but also simulates synaptic functions and is expected to be a potential candidate for future neuromorphic computing applications.
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Affiliation(s)
- Siqi Cheng
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610066, China.
| | - Lun Zhong
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610066, China.
| | - Jinxiang Yin
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610066, China.
| | - Huan Duan
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610066, China.
| | - Qin Xie
- State Key Laboratory of Electronic Thin Films and Integrated Devices, School of electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, 610054, China
| | - Wenbo Luo
- State Key Laboratory of Electronic Thin Films and Integrated Devices, School of electronic Science and Engineering, University of Electronic Science and Technology of China, Chengdu, 610054, China
| | - Wenjing Jie
- College of Chemistry and Materials Science, Sichuan Normal University, Chengdu, 610066, China.
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5
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Xi F, Bozheyev F, Han X, Rusu M, Rappich J, Abdi FF, Bogdanoff P, Kaltsoyannis N, Fiechter S. Enhancing Hydrogen Evolution Reaction via Synergistic Interaction between the [Mo 3S 13] 2- Cluster Co-Catalyst and WSe 2 Photocathode. ACS APPLIED MATERIALS & INTERFACES 2022; 14:52815-52824. [PMID: 36379472 PMCID: PMC9716521 DOI: 10.1021/acsami.2c14312] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/09/2022] [Accepted: 10/12/2022] [Indexed: 06/16/2023]
Abstract
A thiomolybdate [Mo3S13]2- nanocluster is a promising catalyst for hydrogen evolution reaction (HER) due to the high number of active edge sites. In this work, thiomolybdate cluster films are prepared by spin-coating of a (NH4)2Mo3S13 solution both on FTO glass substrates as hydrogen evolving electrodes and on highly 00.1-textured WSe2 for photoelectrochemical water splitting. As an electrocatalyst, [Mo3S13]2- clusters demonstrate a low overpotential of 220 mV at 10 mA cm-2 in 0.5 M H2SO4 electrolyte (pH 0.3) and remain structurally stable during the electrochemical cycling as revealed by in situ Raman spectroscopy. Moreover, as a co-catalyst on WSe2, [Mo3S13]2- clusters enhance the photocurrent substantially by more than two orders of magnitude (from 0.02 to 2.8 mA cm-2 at 0 V vs RHE). The synergistic interactions between the photoelectrode and catalyst, i.e., surface passivation and band bending modification by the [Mo3S13]2- cluster film, promoted HER catalytic activity of [Mo3S13]2- clusters influenced by the WSe2 support, are revealed by intensity-modulated photocurrent spectroscopy and density functional theory calculations, respectively. The band alignment of the WSe2/[Mo3S13]2- heterojunction, which facilitates the electron injection, is determined by correlating UV-vis with photoelectron yield spectroscopy results.
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Affiliation(s)
- Fanxing Xi
- Institute
for Solar Fuels, Helmholtz-Zentrum Berlin
für Materialien und Energie GmbH, Hahn-Meitner-Platz 1, 14109Berlin, Germany
- PV
ComB, Helmholtz-Zentrum Berlin für
Materialien und Energie GmbH, Schwarzschildstrasse 3, 12489Berlin, Germany
| | - Farabi Bozheyev
- Institute
for Solar Fuels, Helmholtz-Zentrum Berlin
für Materialien und Energie GmbH, Hahn-Meitner-Platz 1, 14109Berlin, Germany
- Institute
of Photoelectrochemistry, Helmholtz-Zentrum
Hereon, 21502Geesthacht, Germany
- National
Nanolaboratory, al-Farabi Kazakh National
University, 71 al-Farabi
Ave., 050000Almaty, Kazakhstan
| | - Xiaoyu Han
- Department
of Chemistry, The University of Manchester, Oxford Road, ManchesterM13 9PL, U.K.
| | - Marin Rusu
- Department
Structure and Dynamics of Energy Materials, Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Hahn-Meitner-Platz 1, 14109Berlin, Germany
| | - Jörg Rappich
- Institute
Silicon Photovoltaics, Helmholtz-Zentrum
Berlin für Materialien und Energie GmbH, Magnusstrasse 12, 12489Berlin, Germany
| | - Fatwa F. Abdi
- Institute
for Solar Fuels, Helmholtz-Zentrum Berlin
für Materialien und Energie GmbH, Hahn-Meitner-Platz 1, 14109Berlin, Germany
| | - Peter Bogdanoff
- Institute
for Solar Fuels, Helmholtz-Zentrum Berlin
für Materialien und Energie GmbH, Hahn-Meitner-Platz 1, 14109Berlin, Germany
| | - Nikolas Kaltsoyannis
- Department
of Chemistry, The University of Manchester, Oxford Road, ManchesterM13 9PL, U.K.
| | - Sebastian Fiechter
- Institute
for Solar Fuels, Helmholtz-Zentrum Berlin
für Materialien und Energie GmbH, Hahn-Meitner-Platz 1, 14109Berlin, Germany
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6
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Bozheyev F, Fengler S, Kollmann J, Klassen T, Schieda M. Transient Surface Photovoltage Spectroscopy of (NH 4) 2Mo 3S 13/WSe 2 Thin-Film Photocathodes for Photoelectrochemical Hydrogen Evolution. ACS APPLIED MATERIALS & INTERFACES 2022; 14:22071-22081. [PMID: 35512324 DOI: 10.1021/acsami.2c01623] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Hydrogen produced from solar energy has the potential to replace petroleum in the future. To this respect, there is a need in the abandoned and efficient materials that can continuously split water molecules using solar energy. In this report, an ammonium thiomolybdate (ATM: (NH4)2Mo3S13) is evaluated as a p-type semiconductor film photocathode for hydrogen evolution reaction. The ATM thin films are prepared by spin-coating on fluorine-doped tin oxide substrates, and their structural, morphological, optical, photoelectrical, and photoelectrochemical (PEC) properties are studied. Transient surface photovoltage (TSPV) spectroscopy and spectroscopic ellipsometry indicate the band gap Eg = 1.9 eV for the ATM thin films. Furthermore, the photovoltage of the ATM thin films measured by TSPV is correlated to the photocurrents measured by the PEC characterization that can be used to evaluate the material potential for hydrogen generation. The films exhibit a low photocurrent density of 46 μA cm-2 at 0 VRHE. However, its combination with WSe2 thin-film photocathodes results in a significant increase in photocurrent density up to 4.6 mA cm-2 at 0 VRHE (100 times). The reason for such a strong charge carrier transfer effect for ATM/WSe2 heterojunction photocathodes is studied by TSPV spectroscopy that allows a comprehensive evaluation of potential photovoltaic materials toward PEC hydrogen production. Furthermore, the photovoltage generated by a WSe2 thin film is 30 times lower than that of its single crystal, which indicates that the quality of WSe2 thin films should be improved for faster PEC hydrogen evolution.
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Affiliation(s)
- Farabi Bozheyev
- Institute of Photoelectrochemistry, Helmholtz-Zentrum Hereon GmbH, Max-Planck-Street 1, Geesthacht D-21502, Germany
- National Nanolaboratory, Al-Farabi Kazakh National University, 71 Al-Farabi Avenue, Almaty 050000, Kazakhstan
| | - Steffen Fengler
- Institute of Photoelectrochemistry, Helmholtz-Zentrum Hereon GmbH, Max-Planck-Street 1, Geesthacht D-21502, Germany
| | - Jiri Kollmann
- Institute of Photoelectrochemistry, Helmholtz-Zentrum Hereon GmbH, Max-Planck-Street 1, Geesthacht D-21502, Germany
| | - Thomas Klassen
- Institute of Photoelectrochemistry, Helmholtz-Zentrum Hereon GmbH, Max-Planck-Street 1, Geesthacht D-21502, Germany
| | - Mauricio Schieda
- Institute of Photoelectrochemistry, Helmholtz-Zentrum Hereon GmbH, Max-Planck-Street 1, Geesthacht D-21502, Germany
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7
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Lee J, Bang S, Park HJ, Park DY, Park C, Duong NT, Won YS, Jang J, Oh HM, Choi SH, Kim KK, Jeong MS. Interface Trap Suppression and Electron Doping in Van der Waals Materials Using Cross-Linked Poly(vinylpyrrolidone). ACS APPLIED MATERIALS & INTERFACES 2021; 13:55489-55497. [PMID: 34761893 DOI: 10.1021/acsami.1c12968] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
The instability of van der Waals (vdW) materials leads to spontaneous morphological and chemical transformations in the air. Although the passivation of vdW materials with other resistive materials is often used to solve stability issues, this passivation layer can block carrier injection and thus interfere with charge transfer doping. In this study, a facile method is proposed for n-doping and mediation of Se vacancies in tungsten diselenide (WSe2) by poly(vinylpyrrolidone) (PVP) coating. The major carrier type of the PVP-coated WSe2-based field-effect transistor (FET) was converted from hole (p-type) to electron (n-type). Furthermore, the vacancy-induced interface trap density was reduced by approximately 500 times. This study provides a practical doping and passivation method for the van der Waals materials, as well as a comprehensive understanding of the chemical reaction and electronic transport in these materials.
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Affiliation(s)
- Juchan Lee
- Department of Physics, Hanyang University (HYU), Seoul 04763, Republic of Korea
- Department of Energy Science, Sungkyunkwan University (SKKU), Suwon 16419, Republic of Korea
| | - Seungho Bang
- Department of Energy Science, Sungkyunkwan University (SKKU), Suwon 16419, Republic of Korea
| | - Hyeon Jung Park
- Department of Physics, Hanyang University (HYU), Seoul 04763, Republic of Korea
| | - Dae Young Park
- Department of Physics, Hanyang University (HYU), Seoul 04763, Republic of Korea
| | - Chulho Park
- Department of Energy Science, Sungkyunkwan University (SKKU), Suwon 16419, Republic of Korea
| | - Ngoc Thanh Duong
- Department of Materials Science and Engineering, Phenikaa University, Hanoi 12116, Viet Nam
| | - Yo Seob Won
- Department of Energy Science, Sungkyunkwan University (SKKU), Suwon 16419, Republic of Korea
| | - Jiseong Jang
- Department of Physics, Hanyang University (HYU), Seoul 04763, Republic of Korea
- Department of Energy Science, Sungkyunkwan University (SKKU), Suwon 16419, Republic of Korea
| | - Hye Min Oh
- Department of Physics, Kunsan National University, Kunsan 54150, Republic of Korea
| | - Soo Ho Choi
- Center for Integrated Nanostructure Physics (CINAP), Institute for Basic Science, Suwon 16419, Republic of Korea
| | - Ki Kang Kim
- Department of Energy Science, Sungkyunkwan University (SKKU), Suwon 16419, Republic of Korea
- Center for Integrated Nanostructure Physics (CINAP), Institute for Basic Science, Suwon 16419, Republic of Korea
| | - Mun Seok Jeong
- Department of Physics, Hanyang University (HYU), Seoul 04763, Republic of Korea
- Department of Energy Engineering, Hanyang University (HYU), Seoul 04763, Republic of Korea
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8
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Akinoglu EM, Hoogeveen DA, Cao C, Simonov AN, Jasieniak JJ. Prospects of Z-Scheme Photocatalytic Systems Based on Metal Halide Perovskites. ACS NANO 2021; 15:7860-7878. [PMID: 33891396 DOI: 10.1021/acsnano.0c10387] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Considering the attractive optoelectronic properties of metal halide perovskites (MHPs), their introduction to the field of photocatalysis was only a matter of time. Thus far, MHPs have been explored for the photocatalytic generation of hydrogen, carbon dioxide reduction, organic synthesis, and pollutant degradation applications. Of growing research interest and possible applied significance are the currently emerging developments of MHP-based Z-scheme heterostructures, which can potentially enable efficient photocatalysis of highly energy-demanding redox processes. In this Perspective, we discuss the advantages and limitations of MHPs compared to traditional semiconductor materials for applications as photocatalysts and describe emerging examples in the construction of MHP-based Z-scheme systems. We discuss the principles and material properties that are required for the development of such Z-scheme heterostructure photocatalysts and consider the ongoing challenges and opportunities in this emerging field.
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Affiliation(s)
- Eser M Akinoglu
- ARC Centre of Excellence in Exciton Science, School of Chemistry, University of Melbourne, Parkville, Victoria 3010, Australia
| | - Dijon A Hoogeveen
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
| | - Chang Cao
- ARC Centre of Excellence in Exciton Science, Department of Materials Science and Engineering, Monash University, Clayton, Victoria 3800, Australia
| | - Alexandr N Simonov
- School of Chemistry, Monash University, Clayton, Victoria 3800, Australia
- ARC Centre of Excellence for Electromaterials Science, Monash University, Clayton, Victoria 3800, Australia
| | - Jacek J Jasieniak
- ARC Centre of Excellence in Exciton Science, Department of Materials Science and Engineering, Monash University, Clayton, Victoria 3800, Australia
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9
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Huang L, Yang Y, Zhang C, Yu H, Wang T, Dong X, Li D, Liu Z. A nanostructured MoO 2/MoS 2/MoP heterojunction electrocatalyst for the hydrogen evolution reaction. NANOTECHNOLOGY 2020; 31:225403. [PMID: 32059207 DOI: 10.1088/1361-6528/ab767a] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
Electrocatalytic production of hydrogen from water is considered to be a promising and sustainable strategy. In this work, the low-cost nanostructured MoO2/MoS2/MoP heterojunction is successfully synthesized by phosphorization of the pre-prepared urchin-like MoO2/MoS2 nanospheres as the stable, highly efficient electrocatalysis for the hydrogen evolution reaction (HER). The MoO2/MoS2/MoP-800 (MoO2/MoS2 nanospheres are phosphated at 800 °C) displays a catalytic ability for the HER with an overpotential of 135 mV to achieve 10 mA cm-2 and a Tafel slope of 67 mV dec-1 in 0.5 M H2SO4, which is superior to MoO2/MoS2 nanospheres (200 °C; 24 h), MoO2/MoS2/MoP-700 (MoO2/MoS2 nanospheres are phosphated at 700 °C) and MoO2/MoS2/MoP-900 (MoO2/MoS2 nanospheres are phosphated at 900 °C). Meanwhile, the catalyst exhibits superior properties for HER with an overpotential of 145 mV to achieve 10 mA cm-2 and a Tafel slope of 71 mV dec-1 in 1 M KOH solution. Detailed characterizations reveal that the improved HER performances are significantly related to P-doping and the spherical nanostructure. This work not only provides a low-cost selective for electrocatalytic production of hydrogen, but also serves as a guide to optimize the composition and structure of nanocomposites.
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Affiliation(s)
- Licheng Huang
- Changchun University of Science and Technology Key Laboratory of Applied Chemistry and Nanotechnology, Changchun, 130022, People's Republic of China
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10
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Natarajan K, Saraf M, Gupta AK, Mobin SM. Nanostructured δ-MnO2/Cd(OH)2 Heterojunction Constructed under Ambient Conditions as a Sustainable Cathode for Photocatalytic Hydrogen Production. Ind Eng Chem Res 2020. [DOI: 10.1021/acs.iecr.0c00341] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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11
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Jaegermann W, Kaiser B, Finger F, Smirnov V, Schäfer R. Design Considerations of Efficient Photo-Electrosynthetic Cells and its Realization Using Buried Junction Si Thin Film Multi Absorber Cells. Z PHYS CHEM 2020. [DOI: 10.1515/zpch-2019-1584] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
Abstract
Abstract
As is obvious from previous work on semiconductor photoelectrochemistry, single junction semiconductors do not provide either the required maximum photovoltage or a high photocurrent for solar water splitting, which is required for efficient stand-alone devices. From these experiences we conclude, that multi-junction devices must be developed for bias-free water splitting. In this article we present our design considerations needed for the development of efficient photo-electro-synthetic cells, which have guided us during the DFG priority program 1613. At first, we discuss the fundamental requirements, which must be fulfilled to lead to effective solar water splitting devices. Buried junction and photoelectrochemical arrangements are compared. It will become clear, that the photovoltaic (PV) and electrochemical (EC) components can be optimized separately, but that maximized conversion efficiencies need photovoltages produced in the photovoltaic part of the device, which are adapted to the electrochemical performance of the electrolyzer components without energetic losses in their coupling across the involved interfaces. Therefore, in part 2 we will present the needs to develop appropriate interface engineering layers for proper chemical and electronic surface passivation. In addition, highly efficient electrocatalysts, either for the hydrogen or oxygen evolution reaction (HER, OER), must be adjusted in their energetic coupling to the semiconductor band edges and to the redox potentials in the electrolyte with minimized losses in the chemical potentials. The third part of our paper describes at first the demands and achievements on developing multijunction thin-film silicon solar cells. With different arrangements of silicon stacks a wide range of photovoltages and photocurrents can be provided. These solar cells are applied as photocathodes in integrated directly coupled PV-EC devices. For this purpose thin Pt and Ni catalyst layers are used on top of the solar cells for the HER and a wire connected RuO2 counter electrode is used for the OER. Electrochemical stability has been successfully tested for up to 10,000 s in 0.1 M KOH. Furthermore, we will illustrate our experimental results on interface engineering strategies using TiO2 as buffer layer and Pt nanostructures as HER catalyst. Based on the obtained results the observed improvements, but also the still given limitations, can be related to clearly identified non-idealities in surface engineering either related to recombination losses at the semiconductor surface reducing photocurrents or due to not properly-aligned energy states leading to potential losses across the interfaces.
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Affiliation(s)
- Wolfram Jaegermann
- Institut für Materialwissenschaften der Technischen Universität Darmstadt , Otto-Berndt-Straße 3, 64287 Darmstadt , Germany
| | - Bernhard Kaiser
- Institut für Materialwissenschaften der Technischen Universität Darmstadt , Otto-Berndt-Straße 3, 64287 Darmstadt , Germany
| | - Friedhelm Finger
- IEK-5 Photovoltaik, Forschungszentrum Jülich , D-52425 Jülich , Germany
| | - Vladimir Smirnov
- IEK-5 Photovoltaik, Forschungszentrum Jülich , D-52425 Jülich , Germany
| | - Rolf Schäfer
- Eduard-Zintl-Institut für Anorganische und Physikalische Chemie der Technischen Universität Darmstadt , Alarich-Weiss-Straße 8, 64287 Darmstadt , Germany
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Feng W, Pang W, Xu Y, Guo A, Gao X, Qiu X, Chen W. Transition Metal Selenides for Electrocatalytic Hydrogen Evolution Reaction. ChemElectroChem 2019. [DOI: 10.1002/celc.201901623] [Citation(s) in RCA: 61] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Wenshuai Feng
- School of Physics and ElectronicsCentral South University Changsha Hunan 410083 P. R. China
| | - Wenbin Pang
- School of Physics and ElectronicsCentral South University Changsha Hunan 410083 P. R. China
| | - Yan Xu
- College of Chemistry and Chemical EngineeringCentral South University Changsha Hunan 410083 P. R. China
| | - Aimin Guo
- School of Physics and ElectronicsCentral South University Changsha Hunan 410083 P. R. China
| | - Xiaohui Gao
- School of Physics and ElectronicsCentral South University Changsha Hunan 410083 P. R. China
| | - Xiaoqing Qiu
- School of Physics and ElectronicsCentral South University Changsha Hunan 410083 P. R. China
- College of Chemistry and Chemical EngineeringCentral South University Changsha Hunan 410083 P. R. China
| | - Wei Chen
- State Key Laboratory of Electroanalytical Chemistry Changchun Institute of Applied ChemistryChinese Academy Science Changchun Jilin 130022 P.R. China
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13
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Covalent-bonding-induced strong phonon scattering in the atomically thin WSe 2 layer. Sci Rep 2019; 9:7612. [PMID: 31110268 PMCID: PMC6527611 DOI: 10.1038/s41598-019-44091-9] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/07/2019] [Accepted: 05/07/2019] [Indexed: 11/30/2022] Open
Abstract
In nano-device applications using two-dimensional (2D) van der Waals materials, a heat dissipation through nano-scale interfaces can be a critical issue for optimizing device performances. By using a time-domain thermoreflectance measurement technique, we examine a cross-plane thermal transport through mono-layered (n = 1) and bi-layered (n = 2) WSe2 flakes which are sandwiched by top metal layers of Al, Au, and Ti and the bottom Al2O3 substrate. In these nanoscale structures with hetero- and homo-junctions, we observe that the thermal boundary resistance (TBR) is significantly enhanced as the number of WSe2 layers increases. In particular, as the metal is changed from Al, to Au, and to Ti, we find an interesting trend of TBR depending on the WSe2 thickness; when referenced to TBR for a system without WSe2, TBR for n = 1 decreases, but that for n = 2 increases. This result clearly demonstrates that the stronger bonding for Ti leads to a better thermal conduction between the metal and the WSe2 layer, but in return gives rise to a large mismatch in the phonon density of states between the first and second WSe2 layers so that the WSe2-WSe2 interface becomes a major thermal resistance for n = 2. By using photoemission spectroscopy and optical second harmonic generation technique, we confirm that the metallization induces a change in the valence state of W-ions, and also recovers a non-centrosymmetry for the bi-layered WSe2.
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Isenberg AE, Todt MA, Wang L, Sambur JB. Role of Photogenerated Iodine on the Energy-Conversion Properties of MoSe 2 Nanoflake Liquid Junction Photovoltaics. ACS APPLIED MATERIALS & INTERFACES 2018; 10:27780-27786. [PMID: 30019887 DOI: 10.1021/acsami.8b07617] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Transition metal dichalcogenides (TMDs) such as MoSe2 and WSe2 are efficient materials for converting solar energy to electrical energy in photoelectrochemical photovoltaic cells. One limiting factor of these liquid junction solar cells is that photogenerated oxidation products accumulate on the electrode surface and decrease the photocurrent efficiency. However, it is unclear where the reaction products accumulate on the electrode surface and how they impact the local photoelectrochemical response. This open question is especially important for the structurally heterogeneous TMD nanoflake thin-film electrodes that are promising for large-area solar energy conversion applications. Here, we use a single-nanoflake photoelectrochemical and Raman microscopy approach to probe how the photogenerated I2/I3- products impact the photocurrent collection efficiency and the onset potential in MoSe2-nanoflake|I-/I2|Pt photoelectrochemical solar cells. We observed localized I2/I3- deposition on all types of MoSe2 nanoflake surface motifs, including basal planes, perimeter edges, and interior step edges. Illuminated nanoflake spots with the highest photocurrent collection efficiency are the first to be limited by I2/I3- formation under high-intensity illumination. Interestingly, I2/I3- formation occurs on illuminated surface spots that have the lowest photocurrent onset potential for iodide oxidation, corresponding to the highest open circuit voltage ( VOC). The VOC shifts could be attributed to variations in the surface reaction kinetics or doping density across the nanoflake. Our results highlight important limiting factors of nanoflake thin-film TMD liquid junction photovoltaics under concentrated solar illumination intensities.
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Affiliation(s)
- Allan E Isenberg
- Colorado State University , Department of Chemistry , Fort Collins , Colorado 80523 , United States
| | - Michael A Todt
- Colorado State University , Department of Chemistry , Fort Collins , Colorado 80523 , United States
| | - Li Wang
- Colorado State University , Department of Chemistry , Fort Collins , Colorado 80523 , United States
| | - Justin B Sambur
- Colorado State University , Department of Chemistry , Fort Collins , Colorado 80523 , United States
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