POLYMERS AND POLYMER MATRIX COMPOSITES |
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Influence of Different Substituents on Photoelectric Properties of Biphenyl Imide Group Hole Transport Materials |
ZHENG Huiwen1, JIN Hongzhang1, XU Yan1, YAN Lei1,*, WANG Xingzhu2,*
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1 School of Physics and Optoelectronics, Xiangtan University, Xiangtan 411105, Hunan, China 2 School of Electrical Engineering, University of South China, Hengyang 421001, Hunan, China |
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Abstract In this study, we designed four new hole transport materials (HTMs) in perovskite solar cells (PSCs) and studied the effects of the different substituent groups on their performance. Based on density functional theory (DFT), we investigated the geometry, frontier molecular orbi-tals (FMOs), density of states (DOS), solvation free energy (ΔGsol), absolute hardness, electrostatic potential (ESP), and hole transport rates of all designed molecules. Time-dependent density functional theory (TD-DFT) was used to analyze the absorption spectra, charge density difference diagrams (CDD), heat maps, D index, H index, Sr index, exciton binding energy (Ecoul), and the electron transfer of the designed HTMs. The simulation findings demonstrate that the studied HTMs molecular energy levels match the energy level of perovskite (MAPbI3). Additionally, all designed molecules have good stability and high hole transport rates. Based on the solubility free energies, the designed HTMs were all found to be soluble in the dichloromethane solvent. The UV-visible absorption spectra show that the designed HTMs can broaden the optical absorption range of PSCs in the visible light region. In addition, the photoexcitation process is the transfer of electrons from the donor to the receptor. The designed molecules exhibit great electronic character, optical character, hole transport rates, and stability, which provide ideas for the future design of high-efficiency HTMs.
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Published: 25 April 2024
Online: 2024-04-28
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Fund:National Key R & D Program for International Collaboration (2021YFE0191500) and the Natural Science Foundation of Hunan Province (2023JJ50132). |
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