Solvent-Assisted Thermal-Pressure Strategy for Constructing High Quality CH₃NH₃PbI₃-xClx Films as High-Performance Perovskite Photodetectors

Ning Dong, Xianwei Fu, Gang Lian,* Song Lv, Qilong Wang, Deliang Cui,* and Ching-Ping Wong

ACS Appl. Mater. Interfaces 2018, 10, 8393-8398

Abstract

High-quality CH3NH3PbI3-xClx films have attracted research interests in photoelectric devices because of their improved carrier diffusion length and charge mobility. Herein, a solvent-assisted thermal-pressure strategy is developed to promote the secondary growth of perovskite grains in the films. Highly oriented perovskite films are then obtained with large sized grains (5-10 μm). As a consequence, the photodetectors based on the high-quality CH3NH3PbI3-xClx films exhibit enhanced ophtoelectrical performance, including high on/off ratio (>2.1×10⁴), fast response time (54/63 μs), and high detectivity (∼1.3 × 10¹²). This work suggests an effective approach for high-quality perovskite films, which will be promising candidates for other high-efficiency photoelectric devices.