Bottom-up construction of low-dimensional perovskite thick films for high-performance X-ray detection and imaging

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外文摘要：Quasi-two-dimensional(Q-2D)perovskite exhibits exceptional photoelectric properties and demonstrates reduced ion migration compared to 3D perovskite,making it a promising material for the fabrication of highly sensitive and stable X-ray detectors.However,achieving high-quality perovskite films with sufficient thickness for efficient X-ray absorption remains challenging.Herein,we present a novel approach to regulate the growth of Q-2D perovskite crystals in a mixed atmosphere comprising methylamine(CH3NH2,MA)and ammonia(NH3),resulting in the successful fabrication of high-quality films with a thickness of hundreds of micrometers.Subsequently,we build a heterojunction X-ray detector by incorporating the perovskite layer with titanium dioxide(TiO2).The precise regulation of perovskite crystal growth and the meticulous design of the device structure synergistically enhance the resistivity and carrier transport properties of the X-ray detector,resulting in an ultrahigh sensitivity(29721.4 μC Gyair-1 cm-2)for low-dimensional perovskite X-ray detectors and a low detection limit of 20.9 nGyair s-1.We have further demonstrated a flat panel X-ray imager(FPXI)showing a high spatial resolution of 3.6 Ip mm-1 and outstanding X-ray imaging capability under low X-ray doses.This work presents an effective methodology for achieving high-performance Q-2D perovskite FPXIs that holds great promise for various applications in imaging technology.

作者：

Siyin Dong、Zhenghui Fan、Wei Wei、Shujie Tie、Ruihan Yuan、Bin Zhou、Ning Yang、Xiaojia Zheng、Liang Shen

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作者单位：

Sichuan Research Center of New Materials,Institute of Chemical Materials,China Academy of Engineering Physics,Shuangliu,Chengdu,China

State Key Laboratory of Integrated Optoelectronics,College of Electronic Science and Engineering,International Center of Future Science,Jilin University,Changchun,China

基金：

National Natural Science Foundation of ChinaNational Natural Science Foundation of ChinaSichuan Science and Technology ProgramCareer Development Grant of Institute of Chemical MaterialsInternational Cooperation and Exchange Project of Jilin ProvinceInternational Cooperation and Exchange Project of Jilin Province19th batch of innovative and entrepreneurial talent projects in Jilin ProvinceProject of Science and Technology Development Plan of Jilin Province

项目编号：

NSFC62004182623051282022JDRC0021STB-2021-1020210402079GH20230402056GH2023QN0120220508037RC

出版年：

2024

DOI：

10.1038/s41377-024-01521-2

光:科学与应用(英文版)

中国科学院长春光学精密机械与物理研究所

光:科学与应用(英文版)

CSTPCD

ISSN：2095-5545

年,卷(期)：2024.13(9)