材料科学
卤化物
微晶
光电流
钙钛矿(结构)
单晶
离子
薄脆饼
光电子学
Crystal(编程语言)
分析化学(期刊)
溴
半导体
结晶学
无机化学
化学
有机化学
冶金
色谱法
程序设计语言
计算机科学
作者
Yucheng Liu,Yunxia Zhang,Xuejie Zhu,Jiangshan Feng,Ioannis Spanopoulos,Weijun Ke,Yihui He,Xiaodong Ren,Zhou Yang,Fengwei Xiao,Kui Zhao,Mercouri G. Kanatzidis,Shengzhong Liu
标识
DOI:10.1002/adma.202006010
摘要
Abstract Low ionic migration is required for a semiconductor material to realize stable high‐performance X‐ray detection. In this work, successful controlled incorporation of not only methylammonium (MA + ) and cesium (Cs + ) cations, but also bromine (Br – ) anions into the FAPbI 3 lattice to grow inch‐sized stable perovskite single crystal (FAMACs SC) is reported. The smaller cations and anions, comparing to the original FA + and I – help release lattice stress so that the FAMACs SC shows lower ion migration, enhanced hardness, lower trap density, longer carrier lifetime and diffusion length, higher charge mobility and thermal stability, and better uniformity. Therefore, X‐ray detectors made of the superior FAMACs SCs show the highest sensitivity of (3.5 ± 0.2) × 10 6 μC Gy air −1 cm −2 , about 29 times higher than the latest record of 1.22 × 10 5 μC Gy air −1 cm −2 for polycrystalline MAPbI 3 wafer under the same 40 keV X‐ray radiation. Furthermore, the FAMACs SC X‐ray detector shows a low detection limit of 42 nGy s −1 , stable dark current, and photocurrent response. Finally, it is demonstrated that high contrast X‐ray imaging is realized using the FAMACs SC detector. The effective triple‐cation mixed halide strategy and the high crystalline quality make the present FAMACs SCs promising for next‐generation X‐ray imaging systems.
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