Controlled Cooling for Synthesis of Cs2AgBiBr6 Single Crystals and Its Application for X‐Ray Detection

By Lixiao Yin, Haodi Wu, Weicheng Pan, Bo Yang, Penghua Li, Jiajun Luo, Guangda Niu, Jiang Tang. Advanced Optical Materials, 2019

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Cs2AgBiBr6 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 Cs2AgBiBr6 single crystals. The optimized Cs2AgBiBr6 crystals exhibit smooth surface as well as high resistivity with narrow distribution from 6.10 × 109 to 3.31 × 1010 Ω cm, in contrast to the unoptimized Cs2AgBiBr6 crystals ranging from 6.04 × 107 to 5.61 × 109 Ω cm. Moreover, the fabricated X‐ray detector has a sensitivity of 1974 µC Gyair−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.

Subfields: Atomic and Molecular Physics, and Optics, Electrical and Electronic Engineering, Materials Chemistry

View Paper: https://www.semanticscholar.org/paper/32f1b05ffd8d0cfa97690e7dacc696e3bf79e8d5