Compositional Engineering of Mixed-Cation Lead Mixed-Halide Perovskites for High-Performance Photodetectors

Ye Wang; Xingwang Zhang; Denggui Wang; Xingxing Li; Junhua Meng; Jingbi You; Zhigang Yin; Jinliang Wu

doi:10.1021/acsami.9b06780

Compositional Engineering of Mixed-Cation Lead Mixed-Halide Perovskites for High-Performance Photodetectors

ACS Appl Mater Interfaces. 2019 Aug 7;11(31):28005-28012. doi: 10.1021/acsami.9b06780. Epub 2019 Jul 25.

Authors

Ye Wang^{1

2}, Xingwang Zhang^{1

2}, Denggui Wang^{1

2}, Xingxing Li^{1

2}, Junhua Meng^{1

2}, Jingbi You^{1

2}, Zhigang Yin^{1

2}, Jinliang Wu^{1

2}

Affiliations

¹ Key Lab of Semiconductor Materials Science , Institute of Semiconductors, Chinese Academy of Sciences , Beijing 100083 , China.
² Center of Materials Science and Optoelectronics Engineering , University of Chinese Academy of Sciences , Beijing 100049 , China.

PMID: 31295996
DOI: 10.1021/acsami.9b06780

Abstract

The mixed-cation lead mixed-halide perovskites can combine the advantages of the constituents while avoiding their drawbacks, and they have been widely explored in solar cells. However, there are only few research studies on the mixed-cation lead mixed-halide perovskites for photodetectors. In this work, we fabricate photodetectors based on FA_(1-x)Cs_xPb(Br_yI_(1-y))₃ perovskite and reveal the effect of the chemical composition on the crystal phase stability and device performance of mixed-cation mixed-halide perovskite photodetectors. The FA_0.7Cs_0.3Pb(I_0.8Br_0.2)₃ photodetectors exhibit high specific detectivity, high responsivity, and excellent stability in ambient conditions. Especially, the flexible perovskite photodetectors fabricated on poly(ethylene terephthalate) substrates exhibit extremely high specific detectivity of 2.8 × 10¹³ Jones, which is the highest value to date for flexible perovskite photodetectors, as well as excellent stability and outstanding flexibility. These results indicate that mixed-cation mixed-halide perovskites are promising to be applied in high-performance photodetectors and other flexible optoelectronic devices.

Keywords: compositional engineering; flexible device; perovskite; photodetectors; specific detectivity; stability.