Exploring centimeter-sized crystals of bismuth-iodide perovskite toward highly sensitive X-ray detection

Xin Dong ¹Jing Liang ¹Zhijin Xu ²Huajie Wu ²Lei Wang ²Shihai You ³Junhua Luo ³Lina Li³

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作者信息

1. College of Chemistry,Fuzhou University,Fuzhou 350116,China;State Key Laboratory of Structure Chemistry,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou 350002,China
2. State Key Laboratory of Structure Chemistry,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou 350002,China
3. State Key Laboratory of Structure Chemistry,Fujian Institute of Research on the Structure of Matter,Chinese Academy of Sciences,Fuzhou 350002,China;University of Chinese Academy of Sciences,Beijing 100049,China
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Abstract

Lead-halide perovskites exhibit outstanding performance in X-ray detection due to their intrinsic fea-tures such as high charge carrier mobility,large atomic number,and long carrier lifetime,but the tox-icity of lead is regarded as the major factor hindering their development.Here,we introduce organic molecule(R)-(-)-2-methylpiperazine(R-MPz)into the bismuth-based structure to synthesize lead-free(R)-(H2MPz)Bil5(R-MBI).The high-quality centimeter-sized single crystals have been obtained,which show a low dark current and superior environmental stability.Particularly,the single-crystal device of R-MBI exhibits a high μτ product up to 1.88 × 10-4 cm2/V and a low trap density of 1.21 × 1010 cm-3.Further,the detector displays excellent detection sensitivity of 263.58 μC Gyair-1 cm-2 and a favorable low detection limit of 4.35 μGyair/s,both of which meet the requirement for medical diagnostics.These find-ings shed light on the exploration of innovative bismuth-based hybrid perovskites for high-performance X-ray detection.

Key words

Perovskite/Lead-free/Bismuth-based/X-ray detection/Sensitivity

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基金项目

National Natural Science Foundation of China(22175177)

National Natural Science Foundation of China(21971238)

National Natural Science Foundation of China(22193042)

National Natural Science Foundation of China(21833010)

National Natural Science Foundation of China(22125110)

National Natural Science Foundation of China(22122507)

National Natural Science Foundation of China(21921001)

National Natural Science Foundation of China(U21A2069)

Key Research Program of Frontier Sciences of the Chinese Academy of Sciences(ZDBS-LY-SLH024)

National Postdoctoral Program for Innovative Talents(BX2021315)

National Key Research and Development Program of China(2019YFA0210402)

出版年

2024

中国化学快报(英文版)

中国化学会

中国化学快报(英文版)

CSTPCDCSCD

影响因子：0.771

ISSN：1001-8417

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