3D/2D Core-Shell CsPbBr3 Microcrystals for Stable X-Ray Detection and Imaging

被引：0

作者：

Wang, Xiaoli ^{[1
,2
]}

Su, Xingzhou ^{[1
]}

Yang, Wenxuan ^{[1
]}

Liu, Zhiyuan ^{[1
]}

Luo, Wenjie ^{[1
]}

Han, Binyun ^{[1
,2
]}

Tian, Bin ^{[1
]}

Li, Dong ^{[1
]}

He, Xingchen ^{[1
,2
,3
]}

Zhang, Yang ^{[1
]}

Yu, Xue-Feng ^{[1
,2
,3
]}

Liu, Yanliang ^{[1
,2
,3
]}

机构：

[1] Chinese Acad Sci, Shenzhen Inst Adv Technol, Shenzhen 1, Guangdong, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[3] Chinese Acad Sci, Key Lab Biomed Imaging Sci & Syst, Shenzhen 518055, Guangdong, Peoples R China

来源：

IEEE ELECTRON DEVICE LETTERS | 2025年 / 46卷 / 06期

基金：

中国国家自然科学基金;

关键词：

Three-dimensional displays; Perovskites; Thick films; X-ray detectors; Sensitivity; X-ray imaging; Ions; Detectors; Imaging; X-ray detection; 3D/2D core-shell perovskite; bulk defect passivation; ion migration; PHOTOCONDUCTORS; SENSITIVITY;

D O I：

10.1109/LED.2025.3556477

中图分类号：

TM [电工技术]; TN [电子技术、通信技术];

学科分类号：

0808 ; 0809 ;

摘要：

Although metal halide perovskite (MHP) materials are promising candidates for direct X-ray detection, the surface and internal defects of perovskite polycrystalline thick films lead to severe noise current and poor device stability. Herein, a phenylethylammonium (PEA+) cladding layer was integrated with 3D CsPbBr3 grains, forming 3D/2D core-shell CsPbBr3 perovskite microcrystals. The PEA+, acting as the A-site cation, is able to passivate the surface defects, while the forming 2D perovskite cladding layer inhibits ion migration within CsPbBr3 grains. The blade-coated polycrystalline 3D/2D core-shell CsPbBr3 perovskite thick film exhibits a reduced trap density from 4.32 x 1010 cm(-3) to 4.26 x 109 cm(-3) compared to conventional CsPbBr3 film, with ion migration activation energy increasing from 123 meV to 210 meV. Consequently, the obtained perovskite X-ray detector exhibits a high sensitivity of 29,460 mu C Gy(-1) air cm(-2) and a low detection limit of 84 nGyairs(-1) (50 keV X-ray photon energy), and the detector maintains long-term operational stability with a dark current drift as low as 4.12 x 10(-5) nA mm(-1) s(-1) V-1. Furthermore, we integrated the 3D/2D core-shell polycrystalline CsPbBr3 with a TFT chip (64 x 64 array) and successfully obtained a clear and high-contrast X-ray image of a mouse's paw exhibiting a spatial resolution of 2.5 lp mm(-1).

引用

页码：936 / 939

页数：4

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