期刊
ACS APPLIED MATERIALS & INTERFACES
卷 13, 期 44, 页码 52549-52559出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsami.1c13792
关键词
all-inorganic perovskite solar cells; CsPbI2Br; dopant-free; hole-transport material; device stability
资金
- National Natural Science Foundation of China [62074088, 51903242]
- Ningbo SAMP
- T Innovation 2025 Major Special Programme [2018B10055]
- K.C. Wong Magna Fund in Ningbo University, China
PM6 as a dopant-free hole-transporting material shows remarkable performance enhancements in CsPbI2Br PSCs, including higher power conversion efficiency and improved stability, and also exhibits good performance in organic-inorganic hybrid PSCs.
Hole-transporting materials (HTMs) with desired properties play a crucial role in achieving efficient and stable perovskite solar cells (PSCs). However, most high-performance devices generally employ HTMs that require additional complicated doping treatments, which are harmful to the device stability. In this work, a fluorine-substituted polymer electron-donor material, PM6, is developed as a dopant-free HTM in regular all-inorganic CsPbI2Br PSCs. Benefiting from the matched energylevel alignment, high hole mobility, and effective defect passivation, a champion power conversion efficiency (PCE) of 16.06% with an ultrahigh fill factor of 82.54% is achieved for the PM6-based PSCs. Compared to doped Spiro-OMeTAD (PCE of 14.46%), PM6 significantly enhances the PCE of CsPbI2Br PSCs with negligible hysteresis owing to its more efficient charge transportation, suppressed recombination, and strong trap passivation effect. Moreover, remarkable improvements in long-term stability, thermal stability, and operational stability are all gained for the PM6-based PSCs. In addition, the successful application of PM6 as a dopant-free HTM in organic-inorganic hybrid PSCs enables an impressive PCE of 20.05% with superb device stability, manifesting the generality of the polymer donor material in various PSC systems.
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