Efficient and Stable Tin Perovskite Solar Cells by Pyridine-Functionalized Fullerene with Reduced Interfacial Energy Loss

Bo Li; Xin Wu; He ZhangShoufeng ZhangZhen LiDanpeng GaoChunlei ZhangMuqing ChenShuang XiaoAlex K.-Y. JenShangfeng YangZonglong Zhu

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Efficient and Stable Tin Perovskite Solar Cells by Pyridine-Functionalized Fullerene with Reduced Interfacial Energy Loss

机译：Efficient and Stable Tin Perovskite Solar Cells by Pyridine-Functionalized Fullerene with Reduced Interfacial Energy Loss

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In tin perovskite solar cells (PSCs), fullerene (C_(60)) and fullerene derivative [6,6]-phenyl-C61-butyric acid methyl ester (PCBM) are commonly utilized electron transport materials. However, the energetic disorder, inadequate passivation, and energy level mismatch of C_(60) and PCBM limit the improvement of power conversion efficiency (PCE) and lifespan of tin PSCs. In this work, a multifunctional interface manipulation strategy is developed by introducing a pyridine- functionalized fullerene derivative, fullerene-n-butyl-pyridine (C_(60)-BPy), into the interface between the tin perovskite and the electron transport layer (ETL) to improve the photovoltaic performance and stability of tin PSCs. The C_(60)-BPy can strongly anchor on the perovskite surface via coordination interactions between the pyridine moiety and the Sn~(2+) ion, which not only reinforces the passivation of the trap-state within the tin perovskite film, but also regulates the interface energy level alignment to reduce non-radiative recombination. Moreover, the improved interface binding and carrier transport properties of C_(60)-BPy contribute to superior device stability. The resulting devices have achieved the highest PCE of 14.14% with negligible hysteresis, and are maintained over 95% of their initial PCE under continuous one-sun illumination for 1000 h.

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《Advanced functional materials》 |2022年第39期|2205870.1-2205870.8|共8页
作者
Bo Li; Xin Wu; He ZhangShoufeng ZhangZhen LiDanpeng GaoChunlei ZhangMuqing ChenShuang XiaoAlex K.-Y. JenShangfeng YangZonglong Zhu;
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Department of Chemistry City University of Hong Kong Kowloon 999077, Hong Kong;

CAS Key Laboratory of Materials for Energy Conversion Anhui Laboratory of Advanced Photon Science and Technology Department of Materials Science and Engineering University of Science and Technology of China Hefei 230026, China;

Guangdong Provincial Key Lab of Nano-Micro Materials Research School of Chemical Biology and Biotechnology Shenzhen Graduate School Peking University Shenzhen 518055, ChinaDepartment of Chemistry City University of Hong Kong Kowloon 999077, Hong Kong,Department of Materials Science and Engineering City University of Hong Kong Kowloon 999077, Hong Kong,Department of Materials Science and Engineering University of Washington;

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defect passivation; energy level alignments; energy losses; high efficiencies; pyridine-functionalized fullerenes; tin perovskites;

Efficient and Stable Tin Perovskite Solar Cells by Pyridine-Functionalized Fullerene with Reduced Interfacial Energy Loss

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