Physical Properties of Candidate X-Ray Detector Material Rb 4 Ag 2 BiBr 9

Recently, metal halide perovskites have emerged as promising semiconductor candidates for sensitive X-ray photon detection due to their suitable bandgap energies, excellent charge transport properties, and low material cost afforded by their low-temperature solution-processing preparation. Here, we...

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Published in:Crystal growth & design 2022-02, Vol.22 (2), p.1066-1072
Main Authors: Zhang, Zheng, Ma, Ying-Zhong, Thomas, Leonard, Gofryk, Krzysztof, Saparov, Bayram
Format: Article
Language:English
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Summary:Recently, metal halide perovskites have emerged as promising semiconductor candidates for sensitive X-ray photon detection due to their suitable bandgap energies, excellent charge transport properties, and low material cost afforded by their low-temperature solution-processing preparation. Here, we report an improved methodology for single crystal (SC) growth, thermal and electrical properties of a two-dimensional (2D) layered halide material Rb Ag BiBr , which has been identified as a potential candidate for X-ray radiation detection applications. The measured heat capacity for Rb Ag BiBr implies that there are no structural phase transitions upon cooling. Temperature dependence of thermal transport measurements further suggest remarkably low thermal conductivities of Rb Ag BiBr that are comparable to the lowest reported in literature. The bulk crystal resistivity is determined to be 2.59×10 Ω·cm from the current-voltage (I-V) curve. Density of trap states are estimated to be ~10 cm using the space-charge-limited-current (SCLC) measurements. The fabricated Rb Ag BiBr -based X-ray detector shows good operational stability with no apparent current drift, which may be ascribed to the 2D crystal structure of Rb Ag BiBr . Finally, by varying the X-ray tube current to change the corresponding dose rate, the Rb Ag BiBr X-ray detector sensitivity is determined to be 222.03 uCGy cm (at an electric field of E = 24 V/mm).
ISSN:1528-7483
1528-7505
DOI:10.1021/acs.cgd.1c00986