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Centimeter‐Sized Molecular Perovskite Crystal for Efficient X‐Ray Detection
Author(s) -
Ma Chuang,
Chen Fang,
Song Xin,
Chen Ming,
Gao Lili,
Wang Peijun,
Wen Jialun,
Yang Zhou,
Tang Youzhi,
Zhao Kui,
Liu Shengzhong Frank
Publication year - 2021
Publication title -
advanced functional materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 6.069
H-Index - 322
eISSN - 1616-3028
pISSN - 1616-301X
DOI - 10.1002/adfm.202100691
Subject(s) - materials science , perovskite (structure) , crystal (programming language) , amorphous solid , band gap , optoelectronics , valence (chemistry) , single crystal , excitation , semiconductor , analytical chemistry (journal) , crystallography , chemistry , physics , quantum mechanics , chromatography , computer science , programming language , organic chemistry
Molecular perovskites have demonstrated great potential for ferroelectrics and nonlinear optics; however, their charge transport properties for optoelectronics have rarely been explored. Here, understanding of charge transport behavior of molecular perovskite under X‐ray excitation based on centimeter‐scale TMCM‐CdCl 3 (TMCM + , trimethylchloromethyl ammonium) single crystal is demonstrated. The crystal is fabricated from an aqueous solution and exhibits a large bandgap of 5.51 eV, with the valence band maximum mainly dominated by the Cl‐p/Cd‐d states and the conduction band minimum primarily by Cd‐s/Cl‐p states. Charge mobility exceeding 40 cm 2 V −1 s −1 and mobility–lifetime (µτ) product on the order of 10 −4 cm 2 V −1 for the crystal are observed. These excellent optoelectronic properties translate to an efficient photoresponse under X‐ray excitation, with the sensitivity reaching 128.9 ± 4.64 µC Gy air −1 cm −2 [fivefold higher than that of the commercialized amorphous selenium (α‐Se)] and a low detection limit of 1.06 μC Gy air −1 s −1 (10 V bias). This work pioneers a superior metal‐based molecular perovskite single‐crystal based paradigm for optoelectronic investigation, which may lead to the discovery of a new generation of X‐ray detection and imaging materials.