Surface-Energy-Regulated Growth of α-Phase Cs 0.03 FA 0.97 PbI 3 for Highly Efficient and Stable Inverted Perovskite Solar Cells

Methylammonium (MA)-free formamidinium (FA)-dominated Cs FA PbI is rising as the most promising candidate for highly efficient and stable perovskite solar cells. However, the growth of high-quality Cs FA PbI black-phase perovskite structure without ion doping in the lattice remains a challenge. Here...

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Veröffentlicht in:Advanced materials (Weinheim) 2023-04, Vol.35 (15), p.e2208522
Hauptverfasser: Pan, Ting, Zhou, Wei, Wei, Qi, Peng, Zijian, Wang, Hao, Jiang, Xianyuan, Zang, Zihao, Li, Hansheng, Yu, Danni, Zhou, Qilin, Pan, Mengling, Zhou, Wenjia, Ning, Zhijun
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container_issue 15
container_start_page e2208522
container_title Advanced materials (Weinheim)
container_volume 35
creator Pan, Ting
Zhou, Wei
Wei, Qi
Peng, Zijian
Wang, Hao
Jiang, Xianyuan
Zang, Zihao
Li, Hansheng
Yu, Danni
Zhou, Qilin
Pan, Mengling
Zhou, Wenjia
Ning, Zhijun
description Methylammonium (MA)-free formamidinium (FA)-dominated Cs FA PbI is rising as the most promising candidate for highly efficient and stable perovskite solar cells. However, the growth of high-quality Cs FA PbI black-phase perovskite structure without ion doping in the lattice remains a challenge. Herein, propeller-shaped halogenated tertiary ammonium is synthesized, showing high binding energy on the perovskite surface and large steric hindrance. This molecule can significantly reduce the barrier of high surface energy that suppresses the growth of the α-phase Cs FA PbI structure. As a result, the α-phase structure can be formed at room temperature, which can further act as a seed for the growth of high-quality film. Solar cells based on the film show a record efficiency up to 23.6% for MA free Cs FA PbI solar cells with inverted structure and excellent stability at 85 °C over 200 h.
doi_str_mv 10.1002/adma.202208522
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title Surface-Energy-Regulated Growth of α-Phase Cs 0.03 FA 0.97 PbI 3 for Highly Efficient and Stable Inverted Perovskite Solar Cells
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