Synthesis of two-dimensional phenylethylamine tin-lead halide perovskites with bandgap bending behavior

Shiqi Sui; Jian Zhou; Aifei Wang; Guangcai Hu; Wen Meng; Chuying Wang; Yao Liu; Jiajing Wu; Zhengtao Deng

doi:10.1039/d0na00939c

Synthesis of two-dimensional phenylethylamine tin-lead halide perovskites with bandgap bending behavior

Nanoscale Adv. 2021 May 4;3(13):3875-3880. doi: 10.1039/d0na00939c. eCollection 2021 Jun 30.

Authors

Shiqi Sui¹, Jian Zhou², Aifei Wang³, Guangcai Hu¹, Wen Meng¹, Chuying Wang¹, Yao Liu¹, Jiajing Wu¹, Zhengtao Deng¹

Affiliations

¹ College of Engineering and Applied Sciences, State Key Laboratory of Analytical Chemistry for Life Science, National Laboratory of Microstructures, Nanjing University Nanjing Jiangsu 210023 P. R. China dengz@nju.edu.cn.
² Department of Materials Science and Engineering, Nanjing University, National Laboratory of Solid-State Microstructures Nanjing Jiangsu 210023 People's Republic of China.
³ Institute of Advanced Materials (IAM), Nanjing Tech University (NJ Tech) 5 Xinmofan Road Nanjing 210009 P. R. China.

Abstract

Recently, two-dimensional (2D) metal halide perovskite materials with wide application in perovskite-based solar cells have attracted significant attention. Among them, 2D mixed lead-tin perovskites have not been systematically explored. Herein, we synthesize a 2D phenethylammonium (PEA) tin-lead bromide perovskite, PEA₂Sn _x Pb_1-x Br₄, via a simple solution-phase approach without toxic reagents and high temperatures. By tuning the ratio of Sn and Pb, the UV-vis absorption spectra showed unique bandgap bending behaviors. DFT calculations indicate the key effects of spin-orbital coupling (SOC) without the interference of lattice distortion. Moreover, we provided the standard equation with a correction term to introduce the influence of SOC. These results not only provide a step forward towards the bandgap engineering of perovskites, but also help to expand the application of 2D perovskite materials.