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Controlled Cooling for Synthesis of Cs 2 AgBiBr 6 Single Crystals and Its Application for X‐Ray Detection
Author(s) -
Yin Lixiao,
Wu Haodi,
Pan Weicheng,
Yang Bo,
Li Penghua,
Luo Jiajun,
Niu Guangda,
Tang Jiang
Publication year - 2019
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.201900491
Subject(s) - materials science , halide , perovskite (structure) , evaporation , crystal growth , single crystal , electrical resistivity and conductivity , reproducibility , solubility , analytical chemistry (journal) , crystal (programming language) , semiconductor , ionization , electric field , detector , x ray , optoelectronics , optics , ion , crystallography , inorganic chemistry , chemistry , physics , organic chemistry , chromatography , quantum mechanics , computer science , programming language , thermodynamics
Cs 2 AgBiBr 6 double perovskite recently emerges as a promising semiconductor for ionization detections because of the low detection limit and nontoxic composition. However, it suffers from unsatisfactory reproducibility and wide fluctuation of electrical properties, as also in other halide perovskite systems. Here, solubility and supersolubility are employed as quantitative indicators to direct the growth of Cs 2 AgBiBr 6 single crystals. The optimized Cs 2 AgBiBr 6 crystals exhibit smooth surface as well as high resistivity with narrow distribution from 6.10 × 10 9 to 3.31 × 10 10 Ω cm, in contrast to the unoptimized Cs 2 AgBiBr 6 crystals ranging from 6.04 × 10 7 to 5.61 × 10 9 Ω cm. Moreover, the fabricated X‐ray detector has a sensitivity of 1974 µC Gy air −1 cm −2 under 50 V mm −1 electric field, which is close to lead halide perovskite detectors. This study highlights the importance of quantitative understanding about the growth process, and might also be applicable to other crystal growth methods, for instance, antisolvent or solvent evaporation method.