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A low-cost wide bandgap polymer based on carboxylate substituted thiazole enables efficient organic solar cells with remarkable batch-to-batch reproducibility

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Science China Chemistry 2024年

作者： Xiaodong Zhu Yuchen Lei Jianhong Gao Yanjun He jinsicheng liu Qian Guo Xiang Gao Liwei Xiong Xunchang Wang Renqiang Yang Zhitian liu Hubei Engineering Technology Research Center of Optoelectronic and New Energy Materials Hubei Key Laboratory of Plasma Chemistry and Advanced MaterialsSchool of Materials Science and EngineeringWuhan Institute of Technology Key Laboratory of Optoelectronic Chemical Materials and Devices (Ministry of Education) School of Optoelectronic Materials&TechnologyJianghan University

Constructing the low-cost, high-efficiency, and good batch-to-batch reproducibility polymer donor is vitally important for the application of organic solar cells. Herein, we develop a structurally simple carboxylate-substituted thiazole as an electronwithdrawing building block to construct a low-cost polymer, PBTTzE, containing a facilely prepared chlorinated benzo[1,2-b:4,5-b′]dithiophene(BDTCl) donor unit. Benefiting from synergistic electron deficient effects of chlorination and ester group and C=N, as well as the noncovalent interaction of S···O and S···N, PBTTzE exhibits a deep HOMO energy level(-5.59 eV),and a planar skeleton structure. When combined with the IT-4F acceptor, the polymer(54 kDa) demonstrated a champion PCE of15.87%, which is the highest value in the IT-4F-based binary devices to date. Moreover, PBTTzE exhibits excellent batch-tobatch reproducibility due to its very similar PCEs within a range of 43–76 kDa. In addition, an alloyed state and complementary absorption can be formed between PM6 and PBTTzE. Therefore, in a ternary device with PBTTzE added to the PM6:BTP-eC9blend, a top PCE of 18.76% is achieved due to the suppressed energy loss, prolonged exciton diffusion distance, and improved charge transport. Our work demonstrates that the carboxylate-substituted thiazole is a highly promising acceptor unit for constructing low-cost and high-performance polymers.

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