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Simultaneous Optimization of Efficiency, Stretchability, and Stability in <scp>All‐Polymer</scp> Solar Cells via Aggregation Control<sup>†</sup>

Kaihu XianSchool of Materials Science & Engineering, Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Tianjin University, and Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300350 ChinaKangkang ZhouSchool of Materials Science & Engineering, Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Tianjin University, and Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300350 ChinaMingfei LiSchool of Materials Science & Engineering, Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Tianjin University, and Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300350 ChinaJunwei LiuSchool of Materials Science & Engineering, Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Tianjin University, and Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300350 ChinaYaowen ZhangShanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute, Chinese Academy of Sciences Shanghai 201204 ChinaTao ZhangBeijing National Laboratory for Molecular Sciences, State Key Laboratory of Polymer Physics and Chemistry, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences Beijing 100190, ChinaYong CuiState Key Laboratory of Polymer Physics and ChemistryWenchao ZhaoCollege of Materials Science and Engineering Nanjing Forestry University Nanjing Jiangsu 210037 ChinaChunming YangShanghai Synchrotron Radiation Facility Shanghai Advanced Research Institute, Chinese Academy of Sciences Shanghai 201204 ChinaJianhui HouState Key Laboratory of Polymer Physics and ChemistryYanhou GengSchool of Materials Science & Engineering, Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Tianjin University, and Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300350 ChinaLong YeSchool of Materials Science & Engineering, Tianjin Key Laboratory of Molecular Optoelectronic Sciences, Tianjin University, and Collaborative Innovation Center of Chemical Science and Engineering Tianjin 300350 China

2022en

Ochiq kirish: yoʻq

ABI

Annotatsiya

Comprehensive Summary With the emergence of Y‐series small molecule acceptors, polymerizing the small molecule acceptors with aromatic linker units has attracted significant research attention, which has greatly advanced the photovoltaic performance of all‐polymer solar cells. Despite the rapid increase in efficiency, the unique characteristics ( e. g ., mechanical stretchability and flexibility) of all‐polymer systems were still not thoroughly explored. In this work, we demonstrate an effective approach to simultaneously improve device performance, stability, and mechanical robustness of all‐polymer solar cells by properly suppressing the aggregation and crystallization behaviors of polymerized Y‐series acceptors. Strikingly, when introducing 50 wt% PYF‐IT (a fluorinated version of PY‐IT) into the well‐known PM6:PY‐IT system, the all‐polymer devices delivered an impressive photovoltaic efficiency of 16.6%, significantly higher than that of the control binary cell (15.0%). Compared with the two binary systems, the optimal ternary blend exhibits more efficient charge separation and balanced charge transport accompanying with less recombination. Moreover, a high‐performance 1.0 cm 2 large‐area device of 15% efficiency was demonstrated for the optimized ternary all‐polymer blend, which offered a desirable PCE of 14.5% on flexible substrates and improved mechanical flexibility after bending 1000 cycles. Notably, these are among the best results for 1.0 cm 2 all‐polymer OPVs thus far. This work also heralds a bright future of all‐polymer systems for flexible wearable energy‐harvesting applications.

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Identifikatorlar

DOI: 10.1002/cjoc.202200564

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