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Zhang X, Jin R. Rational Design of Low-Band Gap Star-Shaped Molecules With 2,4,6-Triphenyl-1,3,5-triazine as Core and Diketopyrrolopyrrole Derivatives as Arms for Organic Solar Cells Applications. Front Chem 2019; 7:122. [PMID: 30941343 PMCID: PMC6433785 DOI: 10.3389/fchem.2019.00122] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/04/2018] [Accepted: 02/15/2019] [Indexed: 11/13/2022] Open
Abstract
A series of D-A novel star-shaped molecules with 2,4,6-triphenyl-1,3,5-triazine (TPTA) as core, diketopyrrolo[3,4-c]pyrrole (DPP) derivatives as arms, and triphenylamine (TPA) derivatives as end groups have been systematically investigated for organic solar cells (OSCs) applications. The electronic, optical, and charge transport properties were studied using density functional theory (DFT) and time-dependent DFT (TD-DFT) approaches. The parameters such as energetic driving force ΔE L-L, adiabatic ionization potential AIP, and adiabatic electron affinity AEA were also calculated at the same level. The calculated results show that the introduction of different groups to the side of DPP backbones in the star-shaped molecules can tune the frontier molecular orbitals (FMOs) energy of the designed molecules. The designed molecules can provide match well with those of typical acceptors PCBM ([6,6]-phenyl-C61-butyric acid methyl ester) and PC71BM ([6,6]-phenyl-C71-butyric acid methyl ester). Additionally, the absorption wavelengths of the designed molecules show bathochromic shifts compared with that of the original molecule, respectively. The introduction of different groups can extend the absorption spectrum toward longer wavelengths, which is beneficial to harvest more sunlight. The calculated reorganization energies suggest that the designed molecules are expected to be the promising candidates for ambipolar charge transport materials except molecule with benzo[c]isothiazole group can be used as hole and electron transport material. Moreover, the different substituent groups do not significantly affect the stability of the designed molecules.
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Affiliation(s)
- Xinhao Zhang
- Inner Mongolia Key Laboratory of Photoelectric Functional Materials, Chifeng University, Chifeng, China
- College of Chemistry and Chemical Engineering, Chifeng University, Chifeng, China
| | - Ruifa Jin
- Inner Mongolia Key Laboratory of Photoelectric Functional Materials, Chifeng University, Chifeng, China
- College of Chemistry and Chemical Engineering, Chifeng University, Chifeng, China
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Muraoka A, Fujii M, Mishima K, Matsunaga H, Benten H, Ohkita H, Ito S, Yamashita K. Investigations on the charge transfer mechanism at donor/acceptor interfaces in the quest for descriptors of organic solar cell performance. Phys Chem Chem Phys 2018; 20:12193-12199. [PMID: 29683467 DOI: 10.1039/c8cp01253a] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Herein, we theoretically and experimentally investigated the mechanisms of charge separation processes of organic thin-film solar cells. PTB7, PTB1, and PTBF2 have been chosen as donors and PC71BM has been chosen as an acceptor considering that effective charge generation depends on the difference between the material combinations. Experimental results of transient absorption spectroscopy show that the hot process is a key step for determining external quantum efficiency (EQE) in these systems. From the quantum chemistry calculations, it has been found that EQE tends to increase as the transferred charge, charge transfer distance, and variation of dipole moments between the ground and excited states of the donor/acceptor complexes increase; this indicates that these physical quantities are a good descriptor to assess the donor-acceptor charge transfer quality contributing to the solar cell performance. We propose that designing donor/acceptor interfaces with large values of charge transfer distance and variation of dipole moments of the donor/acceptor complexes is a prerequisite for developing high-efficiency polymer/PCBM solar cells.
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Affiliation(s)
- Azusa Muraoka
- Department of Mathematical and Physical Sciences, Japan Women's University, 2-8-1 Mejirodai, Bunkyo-ku, Tokyo 112-8681, Japan
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Surakhot Y, Laszlo V, Chitpakdee C, Promarak V, Sudyoadsuk T, Kungwan N, Kowalczyk T, Irle S, Jungsuttiwong S. Theoretical rationalization for reduced charge recombination in bulky carbazole-based sensitizers in solar cells. J Comput Chem 2017; 38:901-909. [PMID: 28192642 DOI: 10.1002/jcc.24751] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2016] [Revised: 12/12/2016] [Accepted: 12/31/2016] [Indexed: 11/09/2022]
Abstract
The search for greater efficiency in organic dye-sensitized solar cells (DSCs) and in their perovskite cousins is greatly aided by a more complete understanding of the spectral and morphological properties of the photoactive layer. This investigation resolves a discrepancy in the observed photoconversion efficiency (PCE) of two closely related DSCs based on carbazole-containing D-π-A organic sensitizers. Detailed theoretical characterization of the absorption spectra, dye adsorption on TiO2 , and electronic couplings for charge separation and recombination permit a systematic determination of the origin of the difference in PCE. Although the two dyes produce similar spectral features, ground- and excited-state density functional theory (DFT) simulations reveal that the dye with the bulkier donor group adsorbs more strongly to TiO2 , experiences limited π-π aggregation, and is more resistant to loss of excitation energy via charge recombination on the dye. The effects of conformational flexibility on absorption spectra and on the electronic coupling between the bright exciton and charge-transfer states are revealed to be substantial and are characterized through density-functional tight-binding (DFTB) molecular dynamics sampling. These simulations offer a mechanistic explanation for the superior open-circuit voltage and short-circuit current of the bulky-donor dye sensitizer and provide theoretical justification of an important design feature for the pursuit of greater photocurrent efficiency in DSCs. © 2017 Wiley Periodicals, Inc.
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Affiliation(s)
- Yaowarat Surakhot
- Center for Organic Electronic and Alternative Energy, Department of Chemistry and Center for Innovation in Chemistry, Faculty of Science, Ubon Ratchathani University, Ubon Ratchathani, 34190, Thailand
| | - Viktor Laszlo
- Department of Chemistry, Advanced Materials Science and Engineering Center, and Institute for Energy Studies, Western Washington University, Bellingham, Washington, 98225
| | - Chirawat Chitpakdee
- National Nanotechnology Center, National Science and Technology Development Agency, Klong Luang, Pathumthani, 12120, Thailand
| | - Vinich Promarak
- School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology, Wangchan, Rayong, 21210, Thailand
| | - Taweesak Sudyoadsuk
- School of Molecular Science and Engineering, Vidyasirimedhi Institute of Science and Technology, Wangchan, Rayong, 21210, Thailand
| | - Nawee Kungwan
- Department of Chemistry, Faculty of Science, Chiang Mai University, Chiang Mai, 50200, Thailand
| | - Tim Kowalczyk
- Department of Chemistry, Advanced Materials Science and Engineering Center, and Institute for Energy Studies, Western Washington University, Bellingham, Washington, 98225
| | - Stephan Irle
- Department of Chemistry, Graduate School of Science, Nagoya University, Institute of Transformational Biomolecules (WPI-ITbM) and, Nagoya, 464-8602, Japan
| | - Siriporn Jungsuttiwong
- Center for Organic Electronic and Alternative Energy, Department of Chemistry and Center for Innovation in Chemistry, Faculty of Science, Ubon Ratchathani University, Ubon Ratchathani, 34190, Thailand
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Kawashima E, Fujii M, Yamashita K. Thermal effect on the morphology and performance of organic photovoltaics. Phys Chem Chem Phys 2016; 18:26456-26465. [DOI: 10.1039/c6cp04019e] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The morphology of organic photovoltaics (OPVs) is a significant factor in improving performance, and establishing a method for controlling morphology is necessary.
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Affiliation(s)
- Eisuke Kawashima
- Department of Chemical System Engineering
- Graduate School of Engineering
- The University of Tokyo
- Tokyo 113-8656
- Japan
| | - Mikiya Fujii
- Department of Chemical System Engineering
- Graduate School of Engineering
- The University of Tokyo
- Tokyo 113-8656
- Japan
| | - Koichi Yamashita
- Department of Chemical System Engineering
- Graduate School of Engineering
- The University of Tokyo
- Tokyo 113-8656
- Japan
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Du L, Luo X, Lv W, Zhao F, Peng Y, Tang Y, Wang Y. High-performance organic broadband photomemory transistors exhibiting remarkable UV-NIR response. Phys Chem Chem Phys 2016; 18:13108-17. [DOI: 10.1039/c6cp00432f] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
High-performance organic broadband photomemory transistors by photogenerated minority carrier trapping and accumulation kinetics.
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Affiliation(s)
- Lili Du
- Institute of Microelectronics
- School of Physical Science and Technology
- Lanzhou University
- Lanzhou 730000
- China
| | - Xiao Luo
- Institute of Microelectronics
- School of Physical Science and Technology
- Lanzhou University
- Lanzhou 730000
- China
| | - Wenli Lv
- Institute of Microelectronics
- School of Physical Science and Technology
- Lanzhou University
- Lanzhou 730000
- China
| | - Feiyu Zhao
- Institute of Microelectronics
- School of Physical Science and Technology
- Lanzhou University
- Lanzhou 730000
- China
| | - Yingquan Peng
- Institute of Microelectronics
- School of Physical Science and Technology
- Lanzhou University
- Lanzhou 730000
- China
| | - Ying Tang
- College of Optical and Electronic Technology
- China Jiliang University
- Hangzhou 310018
- China
| | - Ying Wang
- College of Information Engineering
- China Jiliang University
- Hangzhou 310018
- China
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