Premium
Centimeter‐Sized Single Crystal of Two‐Dimensional Halide Perovskites Incorporating Straight‐Chain Symmetric Diammonium Ion for X‐Ray Detection
Author(s) -
Shen Yue,
Liu Yucheng,
Ye Haochen,
Zheng Yiting,
Wei Qi,
Xia Yingdong,
Chen Yonghua,
Zhao Kui,
Huang Wei,
Liu Shengzhong Frank
Publication year - 2020
Publication title -
angewandte chemie international edition
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.831
H-Index - 550
eISSN - 1521-3773
pISSN - 1433-7851
DOI - 10.1002/anie.202004160
Subject(s) - halide , single crystal , ion , crystal (programming language) , dark current , perovskite (structure) , optoelectronics , band gap , analytical chemistry (journal) , excitation , materials science , chemistry , crystallography , physics , photodetector , inorganic chemistry , organic chemistry , chromatography , computer science , programming language , quantum mechanics
Two‐dimensional (2D) AA′ n −1 M n X 3 n +1 type halide perovskites incorporating straight‐chain symmetric diammonium cations define a new type of structure, but their optoelectronic properties are largely unexplored. Reported here is the synthesis of a centimeter‐sized AA′ n −1 M n X 3 n +1 type perovskite, BDAPbI 4 (BDA=NH 3 C 4 H 8 NH 3 ), single crystal and its charge‐transport properties under X‐ray excitation. The crystal shows a staggered configuration of the [PbI 6 ] 4− layers, a band gap of 2.37 eV, and a low trap density of 3.1×10 9 cm −3 . The single‐crystal X‐ray detector exhibits an excellent sensitivity of 242 μC Gy air −1 cm −2 under the 10 V bias (0.31 V μm −1 ), a detection limit as low as 430 nGy air s −1 , ultrastable response current, a stable baseline with the lowest dark current drift of 6.06×10 −9 nA cm −1 s −1 V −1 , and rapid response time of τ rise =7.3 ms and τ fall =22.5 ms. These crystals are promising candidates for the next generation of optoelectronic devices.