Yin Qiuxiao, Wu Jianbo, Zhu Zeng-Kui, Ye Huang, Li Ruiqing, Zhu Tingting, Geng Yaru, Xu Lijun, Han Zhangtong, Zhang Chengshu, Luo Junhua
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China.
School of Physical Science and Technology, Shanghai Tech University, Shanghai 201210, China.
J Phys Chem Lett. 2024 Dec 19;15(50):12348-12356. doi: 10.1021/acs.jpclett.4c02976. Epub 2024 Dec 9.
Metal halide perovskites (MHPs) have shown great potential for direct X-ray detection, but achieving high sensitivity without external bias remains challenging. Chiral-polar alternating cation intercalation (ACI)-type MHPs, with excellent optoelectronic properties and a robust chirality-induced bulk photovoltaic effect (BPVE), offer a promising platform for self-driven X-ray detection. Herein, impressive self-driven X-ray detection performance was achieved by utilizing chiral-polar 2D ACI-type perovskite single crystals of (-PPA)PAPbBr (; -PPA = -1-phenylpropylamine; PA = propylamine). The chiral -PPA cations induce the crystallization of in the chiral-polar space group 2, wherein its spontaneous electric polarization further induces a strong BPVE. Consequently, shows remarkable radiation photovoltaics of 0.75 V, which endows its excellent self-driven X-ray detection with a high sensitivity of 417.2 μC Gy cm and a low detection limit of 24.1 nGy s, meeting the state-of-the-art level by leveraging its intrinsic photovoltaic effect. These findings highlight the huge potential of chiral-polar ACI-type MHPs in self-driven X-ray detection applications.
金属卤化物钙钛矿（MHPs）在直接X射线检测方面显示出巨大潜力，但在无外部偏压的情况下实现高灵敏度仍然具有挑战性。具有优异光电性能和强大的手性诱导体光伏效应（BPVE）的手性-极性交替阳离子插层（ACI）型MHPs为自驱动X射线检测提供了一个有前景的平台。在此，通过利用（-PPA）PAPbBr（；-PPA = -1-苯基丙胺；PA = 丙胺）的手性-极性二维ACI型钙钛矿单晶实现了令人印象深刻的自驱动X射线检测性能。手性-PPA阳离子在手性-极性空间群2中诱导的结晶，其中其自发极化进一步诱导强烈的BPVE。因此，显示出0.75 V的显著辐射光伏效应，赋予其优异的自驱动X射线检测性能，具有417.2 μC Gy cm的高灵敏度和24.1 nGy s的低检测限，通过利用其固有光伏效应达到了当前的先进水平。这些发现突出了手性-极性ACI型MHPs在自驱动X射线检测应用中的巨大潜力。
