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| Synthesis and Photovoltaic Properties of Novel Polythiophene Derivative Containing Thiazoles in Main Chain |
| SUN Daotong1， LI Yuxiang1， ZHAO Baofeng2， QIN Hongmei1* |
| 1. School of Materials Science and Engineering, Xi’an University of Science and Technology, Xi’an 710054, China;
2. State Key Laboratory of Fluorine & Nitrogen Chemicals, Xi’an Modern Chemistry Research Institute, Xi’an 710065, China |
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Abstract Polythiophene(PT) derivatives are widely used in organic solar cells due to their simple synthesis and good photoelectric properties, but their development is limited by their high energy level. Therefore, in order to reduce its energy level structure, this paper introduced thiazole into the polythiophene derivative backbone chain to synthesize a new polymer donor PBTzCl-T. The photoelectric properties were studied by UV-vis absorption spectroscopy, electrochemical cyclic voltammetry and density functional theory(DFT) calculation. The results show that the introduction of thiazoles can effectively reduce the HOMO and LUMO levels of polymers, thus improving the open circuit voltage of photovoltaic devices. Meanwhile, PBTzCl-T exhibits different preaggregation behaviors in different solvents, which affects the charge transfer ability and active layer morphology of polymer at the interface of D/A, leading to the change of short-circuit current and filling factor of photovoltaic devices.
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Received: 02 April 2022
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