journal article·2026-01

Stable 2D Perovskite Crystal Achieved by Large Lattice Distortion for Self‐Powered X‐Ray Detection

Hanqing Zeng, Xiaolong Feng, Beiquan Jia, Yiru Gu, Bobo Zhang, Jiaxue You, Shilong Jia, Pengda Tong, Ningyi Yuan, Jianning Ding, Lu Zhang, Shengzhong(Frank) Liu

Advanced Optical Materials· Volume 14· Issue 3
Publisher page

Abstract

Abstract 2D Dion‐Jacobson (DJ) ferroelectric perovskites show outstanding potential for self‐powered X‐ray detection due to their high bulk resistivity and robust bulk photovoltaic effect (BPVE). Existing literature generally considered distortion of inorganic octahedral cages as detrimental to their photoelectric properties. Herein, this study demonstrates that larger distortion may be designed to attain more stable structures by promoting stronger hydrogen bonding between the inorganic cage and the organic chains, thus effectively suppressing ion migration. Furthermore, lattice distortion triggers the formation of electric dipoles, inducing spontaneous polarity and thereby augmenting the collection efficiency of photo generated charges. Leveraging the out‐of‐plane ferroelectric polarity of 4AMPPbI 4 , a self‐powered X‐ray detection is pioneered with the vertical structure, offering superior integration and assembly for practical applications compared to lateral‐structures. The resulting X‐ray detector exhibits exceptional performance, featuring a low noise current of 7.53 pA and an impressive self‐powered sensitivity of 234.74 µC Gy air −1 cm −2 at zero bias, surpassing all 2D self‐powered detectors in detection limits (6.6 nGy air s −1 ). Moreover, the device demonstrates commendable storage stability, retaining 95.9% initial sensitivity over 60 days under a 50V bias and 94.7% over 30 days in self‐powered mode.
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Research context

OpenAlex topics: Perovskite Materials and Applications · Multiferroics and related materials · Advanced Photocatalysis Techniques

SciVX discovery tags are terminology-based. OpenAlex topics are source-provided classifications.

Affiliations

Key Laboratory of Applied Surface and Colloid Chemistry Ministry of Education Shaanxi Key Laboratory for Advanced Energy Devices Shaanxi Engineering Lab for Advanced Energy Technology International Joint Research Center of Shaanxi Province for Photoelectric Materials Science Institute for Advanced Energy Materials School of Materials Science and Engineering Shaanxi Normal University Xi'an 710119 China

Key Laboratory for Macromolecular Science of Shaanxi Province and Shaanxi Key Laboratory for Advanced Energy Devices School of Materials and Engineering Shaanxi Normal University Xi'an 710062 China

Department of Materials Science and Engineering Hong Kong Institute for Clean Energy City University of Hong Kong Hong Kong 999077 China

Key Laboratory of Photovoltaic Science and Technology Changzhou University Changzhou 213164 P. R. China

School of Materials Science and Engineering Jiangsu Collaborative Innovation Center of Photovoltaic Science and Engineering Jiangsu Province Cultivation Base for State Key Laboratory of Photovoltaic Science and Technology Changzhou University Changzhou 213164 P. R. China

Dalian National Laboratory for Clean Energy iChEM Dalian Institute of Chemical Physics Chinese Academy of Sciences Dalian 116023 China

CNNP Optoelectronics Technology 2828 Canghai Road, Lingang Shanghai 201306 China

Funding

National Key Research and Development Program of China · National Natural Science Foundation of China · Higher Education Discipline Innovation Project · Dalian National Laboratory for Clean Energy · Fundamental Research Funds for the Central Universities

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