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

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...

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Bibliographic Details
Published in:Advanced optical materials 2019-10, Vol.7 (19), p.n/a
Main Authors: Yin, Lixiao, Wu, Haodi, Pan, Weicheng, Yang, Bo, Li, Penghua, Luo, Jiajun, Niu, Guangda, Tang, Jiang
Format: Article
Language:English
Subjects:
Crystal growth
crystal growth methods
Electric fields
Electrical properties
Lead compounds
Materials science
Metal halides
Optics
perovskite single crystals
Perovskites
radiation detection
Single crystals
Variation
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Summary: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. The optimized Cs2AgBiBr6 single crystal exhibits good performance as X‐ray detector. The synthesis process is optimized according to the solubility versus temperature curves. The optimized Cs2AgBiBr6 crystals achieve high resistivity with narrow distribution from 6.10 × 109 to 3.31 × 1010 Ω cm. The fabricated X‐ray detector reaches a sensitivity of 1974 µC Gyair−1 cm‐2.
ISSN:2195-1071
2195-1071
DOI:10.1002/adom.201900491