Gradient 2D/3D Perovskite Films Prepared by Hot‐Casting for Sensitive Photodetectors

Advanced Science

Chun‐Ki Liu¹  Xuyun Guo¹  Feng Yan¹  Guanqi Tang¹  Naixiang Wang¹  Ye Zhu¹  Hok‐Leung Loi¹  Jiajun Song¹  Jiupeng Cao¹ 

[1] Department of Applied Physics The Hong Kong Polytechnic University Hung Hom Kowloon Hong Kong;

关键词: 2D perovskites;    hot‐casting;    perovskites;    photodetectors;    vertical heterojunctions;   

DOI  :  10.1002/advs.202000776

来源: DOAJ

【 摘 要 】

Abstract 2D Ruddlesden–Popper perovskites have attracted wide attention recently because of tunable optoelectronic properties and have been used as alternatives to their 3D counterparts in various optoelectronic devices. Here, a series of (PEA)2(MA)n−1PbnI3n+1 perovskite thin films is designed and fabricated by a convenient hot‐casting method to obtain gradient n in the films, which leads to the formation of vertical heterojunctions that can enhance charge separation in the films under light illumination. Based on a single gradient perovskite film, a highly sensitive and stable photodetector with a responsivity up to 149 AW−1 and a specific detectivity of 2 × 1012 Jones is obtained. This work paves a way to realizing high‐performance optoelectronic devices with enhanced charge separation by introducing compositional gradient in a perovskite film.

【 授权许可】

Unknown