Chen Guirong, Zhu Zeng-Kui, Wu Jianbo, Yu Panpan, Zeng Ying, Dai Hongliang, Yang Huawei, Wu Wenhui, Wang Yueying, Luo Junhua
College of Chemistry and Materials, Key Laboratory of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education, Jiangxi Normal University, Nanchang, Jiangxi 330022, P. R. China.
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences Fuzhou, Fujian 350002, P. R. China.
ACS Appl Mater Interfaces. 2024 Dec 11;16(49):67970-67978. doi: 10.1021/acsami.4c14963. Epub 2024 Dec 2.
2D hybrid perovskites (HPs) have great potential for high-performance X-ray detection due to their strong radiation absorption and flexible structure. However, there remains a need to explore avenues for enhancing their detection capabilities. Optimizing the detection performance through modification of their structural properties presents a promising strategy. Herein, we explore the impact of modifying the organic spacer layer in two distinct 2D layered HPs, namely, Ruddlesden-Popper (-MPA)PbBr (, -MPA = methylphenethylammonium) and (-MPA)EAPbBr (EA = ethylammonium) () with alternating cation intercalation (ACI), on their X-ray detection performance. The insertion of EA into results in a flatter inorganic skeleton, narrower spacing, and higher density compared to . This structural modification effectively optimizes carrier transport and X-ray absorption in , enhancing the X-ray detection performance. Notably, exhibits a polar structure with intrinsic spontaneous polarization, contributing to a bulk photovoltaic of 0.4 V. This feature enables single-crystal detectors to achieve self-driven X-ray detection with a low detection limit of 82.5 nGy s under a 0 V bias. This work highlights the efficacy of the ACI strategy in structural modification and its significant effect on X-ray detection properties, providing insights for the design and optimization of new materials.
