Reveal the Humidity Effect on the Phase Pure CsPbBr3 Single Crystals Formation at Room Temperature and Its Application for Ultrahigh Sensitive X‐Ray Detector. Issue 2 (10th November 2021)

• Record Type: Journal Article
• Authors: Di, Jiayu; Li, Haojin; Su, Jie; Yuan, Haidong; Lin, Zhenhua; Zhao, Kui; Chang, Jingjing; Hao, Yue
• Is Part Of: Advanced science. Volume 9:Issue 2(2022)
• Page Start: n/a
• Page End: n/a
• Publication Date: 2021-11-10
• Subjects: phase pure CsPbBr3 -- single crystals -- solution method -- ultrahigh sensitive -- X‐ray detectors; Science -- Periodicals; 505
• DOI: 10.1002/advs.202103482
• Languages: English
• ISSNs: 2198-3844

Abstract

Abstract: Generally, growing phase pure CsPbBr3 single crystals is challenging, and CsPb2 Br5 or Cs4 PbBr6 by‐products are usually formed due to the different solubilities of CsBr and PbBr2 in the single solvent. Herein, the growth of high‐quality phase pure CsPbBr3 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 CsPbBr3 to two dimensional (2D) layered tetragonal CsPb2 Br5 and the detailed mechanism induced by humidity are revealed. Moreover, compared with the organic–inorganic perovskite, the prepared CsPbBr3 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 CsPbBr3 single crystals show a high sensitivity and a low detection limit of 1.89 μGyair s –1, all of which meet the needs of medical diagnosis. Abstract : The mixed products of CsBr and PbBr2 are rich and diverse, which is a phenomenon of people scratching their heads. In the humidity controlled low‐temperature preparation process, the mechanism of its diversity is uncovered through the transformations of products under the influence of different conditions and a valuable guidance is provided for the subsequent crystal acquisition and growth.