Gas-Phase Construction of Compact Capping Layers for High-Performance Halide Perovskite X-Ray Detectors

Halide perovskites have emerged as promising materials for X-ray detection with exceptional properties and reasonable costs. Among them, heterostructures between 3D perovskites and low-dimensional perovskites attract intensive studies of their advantages due to low-level ion migration and decent stability. However, there is still a lack of methods to precisely construct heterostructures and a fundamental understanding of their structure-dependent optoelectronic properties. Herein, a gas-phase method was developed to grow 2D perovskites directly on 3D perovskites with nanoscale accuracy. In addition, the larger steric hindrance of organic layers of 2D perovskites was proved to enable slower ion migration, which resulted in reduced trap states and better stability. Based on MAPbBr<sub>3</sub> single crystals with the (PA)<sub>2</sub>PbBr<sub>4</sub> capping layer, the X-ray detector achieved a sensitivity of 22,245 μC Gy<sub>air</sub><sup>-1</sup> cm<sup>-2</sup>, a response speed of 240 μs, and a dark current drift of 1.17 × 10<sup>-4</sup> nA cm<sup>-1</sup> s<sup>-1</sup> V<sup>-1</sup>, which were among the highest reported for state-of-the-art perovskite-based X-ray detectors. This study presents a precise synthesis method to construct perovskite-based heterostructures. It also brings an in-depth understanding of the relationship between lattice structures and properties, which are beneficial for advancing high-performance and cost-effective X-ray detectors.

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Publication Details

Journal
Nano-Micro Letters
Published
2025-12-19
DOI
https://doi.org/10.1007/s40820-025-01900-3
Primary Topic
Perovskite Materials and Applications
Type
article
Field-Weighted Citation Impact
0.00

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article

Gas-Phase Construction of Compact Capping Layers for High-Performance Halide Perovskite X-Ray Detectors

Shoufeng Zhang, Chaojie Hao, Shuang Xiao, Xiangfan Xie et al.
Nano-Micro Letters
Perovskite Materials and Applications
article

Gas-Phase Construction of Compact Capping Layers for High-Performance Halide Perovskite X-Ray Detectors

Shoufeng Zhang, Chaojie Hao, Shuang Xiao, Xiangfan Xie, Kezhou Fan, Guangda Niu, Bin Yang, Kai‐Hang Ye, Zhang Qu, Shengqiao Zeng, Cangtao Zhou, Wallace C. H. Choy, Kam Sing Wong, Xingzhu Wang, Hui Li, Lei Yan, Bin Xue, Bin Zhang, Fang Xu
article en

Abstract

Halide perovskites have emerged as promising materials for X-ray detection with exceptional properties and reasonable costs. Among them, heterostructures between 3D perovskites and low-dimensional perovskites attract intensive studies of their advantages due to low-level ion migration and decent stability. However, there is still a lack of methods to precisely construct heterostructures and a fundamental understanding of their structure-dependent optoelectronic properties. Herein, a gas-phase method was developed to grow 2D perovskites directly on 3D perovskites with nanoscale accuracy. In addition, the larger steric hindrance of organic layers of 2D perovskites was proved to enable slower ion migration, which resulted in reduced trap states and better stability. Based on MAPbBr<sub>3</sub> single crystals with the (PA)<sub>2</sub>PbBr<sub>4</sub> capping layer, the X-ray detector achieved a sensitivity of 22,245 μC Gy<sub>air</sub><sup>-1</sup> cm<sup>-2</sup>, a response speed of 240 μs, and a dark current drift of 1.17 × 10<sup>-4</sup> nA cm<sup>-1</sup> s<sup>-1</sup> V<sup>-1</sup>, which were among the highest reported for state-of-the-art perovskite-based X-ray detectors. This study presents a precise synthesis method to construct perovskite-based heterostructures. It also brings an in-depth understanding of the relationship between lattice structures and properties, which are beneficial for advancing high-performance and cost-effective X-ray detectors.

Nano-Micro LettersVol. 18(1)
Guangdong University of Technology (CN), Guangxi University of Science and Technology (CN), Hong Kong University of Science and Technology (HK), Energy Storage Systems (United States) (US), Wuhan National Laboratory for Optoelectronics (CN), Shenzhen Technology University (CN), Advanced Laser Technology (United Kingdom) (GB), Huazhong University of Science and Technology (CN), University of Hong Kong (HK), University of South China (CN)
Shenzhen Technology University, National Natural Science Foundation of China, University of Hong Kong, Innovation and Technology Fund, National Key Research and Development Program of China
Openalex Percentile: Top 58%
Perovskite Materials and Applications
DOIOpen Access PDFOpenAlex
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