Controllable metastable growth of perovskite single crystals for highly sensitive X-ray detection. Issue 17 (12th April 2022)

• Record Type: Journal Article
• Authors: Zhu, Zhihao; Li, Wen; Deng, Wen; He, Weidong; Yan, Cheng; Peng, Xiaodong; Zeng, Xiankan; Gao, Yue; Fu, Xuehai; Lin, Na; Gao, Bo; Yang, Weiqing
• Is Part Of: Journal of materials chemistry. Volume 10:Issue 17(2022)
• Page Start: 6837
• Page End: 6845
• Publication Date: 2022-04-12
• Subjects: Materials -- Periodicals; Chemistry, Analytic -- Periodicals; Optical materials -- Research -- Periodicals; Electronics -- Materials -- Research -- Periodicals; 543.0284
• DOI: 10.1039/d2tc00235c
• Languages: English
• ISSNs: 2050-7526

Abstract

Abstract : MAPbBr3 single crystals (SCs) were obtained by a low-temperature controllable metastable crystallization method, which regulates the growth process to low temperature and ensures excellent optoelectronic properties of the as-prepared SCs. Abstract : Single crystalline perovskites with long carrier lifetime, large carrier mobility and high atomic number emerge as highly sensitive X-ray detection materials. Precisely controlling the growth of high-quality perovskite single crystals (SCs) is still a big challenge to date. Herein, a simple, convenient and highly reproducible method, low-temperature controllable metastable crystallization (LCMC), is shown to prepare high-quality CH3 NH3 PbBr3 (MAPbBr3 ) SCs at a low temperature of 45 °C. A surprisingly reduced full width at half-maximum of the (001) and (002) planes and hence a higher crystalline quality was achieved for the LCMC-MAPbBr3 SCs as compared to the inverse temperature crystallization (ITC) SCs. Moreover, the LCMC-MAPbBr3 SCs possess longer carrier lifetime increased by nearly 248% to 1126 ns, larger carrier mobility increased by 146% to 87.8 cm 2 V −1 s −1, and significantly lower trap density of 2.1 × 10 9 cm −3 (reduced by around 89%) compared with the ITC samples. Based on the high-quality SCs, the as-developed X-ray detector demonstrates a high sensitivity of 2975.7 μC Gyair −1 cm −2 and a lowest detectable dose rate of 0.48 μGyair s −1 . Evidently, this work may pave the way for controlling the crystallization process of perovskites, which is essential for enhancing the further application of perovskite SCs.