Thermodynamically induced crystal restructuring to make CsPbCl_(3) single crystal films for weak light detection  

作　　者：Xiyan Pan Tai An Jie Sun Hua Dong Zhu Ma Guangxing Liang Yongbo Yuan Yang Li Wuqiang Wu Yong Ding Liming Ding 

机构地区：[1]Center for Excellence in Nanoscience (CAS), Key Laboratory of Nanosystem and Hierarchical Fabrication (CAS), National Center for Nanoscience and Technology, Beijing, 100190, China [2]University of Chinese Academy of Sciences, Beijing, 100049, China [3]School of Electronic Science and Engineering, Xi’an Jiaotong University, Xi’an, 710049, China [4]School of New Energy and Materials, Southwest Petroleum University, Chengdu, 610500, China [5]College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, China [6]School of Physics and Electronics, Central South University, Changsha, 410083, China [7]School of Energy and Power, Jiangsu University of Science and Technology, Zhenjiang, 212000, China [8]School of Chemistry, Sun Yat-sen University, Guangzhou, 510006, China [9]Beijing Key Laboratory of Novel Thin-Film Solar Cells, North China Electric Power University, Beijing, 102206, China

出　　处：《Nano Research》2024年第11期9775-9783,共9页纳米研究（英文版）

基　　金：the National Key Research and Development Program of China(Nos.2022YFB3803300 and 2023YFE0116800);Beijing Natural Science Foundation(No.IS23037).

摘　　要：CsPbCl_(3) perovskite is considered a highly promising material for ultraviolet (UV) photodetectors due to its exceptional thermal stability and excellent short-wavelength light response. However, its high lattice energy and low polarizability result in extremely low solubility in conventional solvents, making the synthesis of CsPbCl_(3) single crystals a significant challenge. In this study, we propose a novel thermodynamically induced crystal restructuring (TICR) process that can transform microcrystalline films (MCFs) into single crystal films (SCFs) within a short period. This method, for the first time, has successfully achieved the synthesis of centimeter-sized CsPbCl_(3) SCFs and the mechanism has been explored in depth using in-situ techniques. Furthermore, we report the first instance of a CsPbCl_(3) SCF UV photodiode, which exhibits a record-breaking on/off ratio of 3.32 × 10^(7) and a detectivity of up to 1.15 × 10^(14) Jones under 0 V bias. It demonstrates excellent response even under weak light conditions of 10 nW·cm^(−2) and maintains outstanding stability with almost no performance degradation after 15 months. This study provides a novel approach for the synthesis of perovskite single crystals and holds significant potential for advancing the development of high-performance optoelectronic devices.

关 键 词：CsPbCl3 single crystal film crystal restructuring PHOTODIODE ultraviolet detector 

分 类 号：O62[理学—有机化学]