Open AccessReveal the Humidity Effect on the Phase Pure CsPbBr 3 Single Crystals Formation at Room Temperature and Its Application for Ultrahigh Sensitive X‐Ray Detector
Author(s) -
Di Jiayu,
Li Haojin,
Su Jie,
Yuan Haidong,
Lin Zhenhua,
Zhao Kui,
Chang Jingjing,
Hao Yue
Publication year - 2022
Publication title -
advanced science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 5.388
H-Index - 100
ISSN - 2198-3844
DOI - 10.1002/advs.202103482
Subject(s) - tetragonal crystal system , humidity , perovskite (structure) , materials science , phase (matter) , evaporation , detector , hydrothermal circulation , phase transition , analytical chemistry (journal) , relative humidity , crystallography , chemical engineering , optics , chemistry , condensed matter physics , thermodynamics , physics , organic chemistry , engineering
Generally, growing phase pure CsPbBr 3 single crystals is challenging, and CsPb 2 Br 5 or Cs 4 PbBr 6 by‐products are usually formed due to the different solubilities of CsBr and PbBr 2 in the single solvent. Herein, the growth of high‐quality phase pure CsPbBr 3 perovskite single crystals at room temperature by a humidity controlled solvent evaporation method is reported first. Meanwhile, the room temperature phase transition process from three dimensional (3D) cubic CsPbBr 3 to two dimensional (2D) layered tetragonal CsPb 2 Br 5 and the detailed mechanism induced by humidity are revealed. Moreover, compared with the organic–inorganic perovskite, the prepared CsPbBr 3 single crystals are much more stable under high humidity, which satisfies the long‐term working conditions of X‐ray detectors. The X‐ray detectors based on CsPbBr 3 single crystals show a high sensitivity and a low detection limit of 1.89 μGy air s –1 , all of which meet the needs of medical diagnosis.