Liang Jing, Wu Huajie, Dong Xin, Xu Zhijin, Chen Tianqi, Luo Junhua, Li Lina
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fujian 350002, China.
College of Chemistry and Materials Science Fujian Normal University, Fuzhou 350007, P. R. China.
ACS Appl Mater Interfaces. 2025 May 21;17(20):29828-29835. doi: 10.1021/acsami.5c01298. Epub 2025 May 7.
Metal halide perovskites have emerged as outstanding X-ray detection absorption candidates, benefiting from their excellent carrier mobility, strong radiation absorption capability, and ease of preparation. However, the realization of highly anisotropic X-ray detection with a tunable performance has rarely been investigated. Two-dimensional (2D) chiral-polar hybrid perovskites with the natural multiple quantum wells (MQWs) structure and the bulk photovoltaic effect (BPVE) present a prospective solution to meet the requirement of highly anisotropic X-ray detection. The pair of 2D chiral-polar perovskites has been synthesized in this work, termed (--MPA)PAPbI and (--MPA)PAPbI ( and MPA = methylphenethylamine and PA = propylamine), aiming to achieve unique anisotropic X-ray detection resulting from the coupling of the distinctive MQWs structure and the BPVE. As expected, photodetectors based on high-quality single crystals of result in a high dichroism ratio (/ ≈ 7) for self-powered polarized-light detection. Strikingly, these photodetectors achieve high anisotropic ratios, reaching up to 9 under X-ray irradiation. This work reveals a strong correlation between X-ray detection performance and the coupling of specially oriented crystals with the BPVE, opening new possibilities for the realization of tunable X-ray detection.
