Affiliation:
1. State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of Matter Chinese Academy of Sciences Fuzhou Fujian 350002 China
2. School of Chemistry and Chemical Engineering Key Laboratory of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education Jiangxi Normal University Nanchang Jiangxi 330022 China
3. University of Chinese Academy of Sciences Beijing 100049 China
4. Fujian Science and Technology Innovation Laboratory for Optoelectronic Information of China Fuzhou Fujian 350108 China
Abstract
AbstractLead halide hybrid perovskites have made great progress in direct X‐ray detection and broadband photodetection, but the existence of toxic Pb and the demand for external operating voltage have severely limited their further applications and operational stability improvements. Therefore, exploring “green” lead‐free hybrid perovskite that can both achieve X‐ray detection and broadband photodetection without external voltage is of great importance, but remains severely challenging. Herein, using centrosymmetric (BZA)3BiI6 (1, BZA = benzylamine) as a template, a pair of chiral‐polar lead‐free perovskites, (BZA)2(R/S‐PPA)BiI6 (2‐R/S, R/S‐PPA = (R/S)‐1‐Phenylpropylamine) are successfully obtained by introducing chiral aryl cations of (R/S)‐1‐Phenylpropylamine. Compared to 1, chiral‐polar 2‐R presents a significant irradiation‐responsive bulk photovoltaic effect (BPVE) with an open circuit photovoltage of 0.4 V, which enables it with self‐powered X‐ray, UV–vis‐NIR broadband photodetection. Specifically, 2‐R device exhibits an ultralow detection limit of 18.5 nGy s−1 and excellent operational stability. Furthermore, 2‐R as the first lead‐free perovskite achieves significant broad‐spectrum (377–940 nm) photodetection via light‐induced pyroelectric effect. This work sheds light on the rational crystal reconstruction engineering and design of “green” hybrid perovskite toward high‐demanded self‐powered radiation detection and broadband photodetection.
Funder
National Natural Science Foundation of China
Natural Science Foundation of Fujian Province
National Key Research and Development Program of China
China Postdoctoral Science Foundation
National Postdoctoral Program for Innovative Talents
Subject
Biomaterials,Biotechnology,General Materials Science,General Chemistry