Pressure effects on the inductive loop, mixed conduction, and photoresponsivity in formamidinium lead bromide perovskite

Tianji Ou, Xinjun Ma, Huacai Yan, Wenshu Shen, Hao Liu, Yonghao Han, Xizhe Liu, Cailong Liu, Yanzhang Ma, Chunxiao Gao

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5 Scopus citations

Abstract

Further efficiency boost of organic-inorganic perovskite solar cells is hampered by limited knowledge on ion migration, inductive loops, and the relationship between structures and properties in organometal halide perovskites. In this work, in situ alternating current impedance spectroscopy measurements on CH(NH 2 ) 2 PbBr 3 (FAPbBr 3 ) have been carried out under high pressure up to 4.8 GPa. The inductive loop has been discovered at low frequencies and can be tuned dramatically by applying pressure, which is attributed to large FA ion migration in FAPbBr 3 . Two discontinuous changes are observed in both ionic and electronic resistances around phase transition pressure. The pressure dependent photoresponse of FAPbBr 3 has also been studied by in situ photocurrent measurements under high pressure up to 3.8 GPa. It indicates that the photocurrent of FAPbBr 3 can be enhanced remarkably at 1.3 GPa and the largest photocurrent value in FAPbBr 3 is nearly 10 times larger than that in CH 3 NH 3 PbBr 3 and about 3 times larger than that in CH 3 NH 3 PbI 3 .

Original languageEnglish
Article number262105
JournalApplied Physics Letters
Volume113
Issue number26
DOIs
StatePublished - Dec 24 2018

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