Jiang Yuhang, Zhang Chengshu, Zhu Zeng-Kui, Wu Jianbo, Yu Panpan, Zeng Ying, Ye Huang, Dai Hongliang, Li Ruiqing, Guan Qianwen, Chen Guirong, Yang Huawei, Luo Junhua
School of Chemistry and Chemical Engineering, Jiangxi Normal University, Key Laboratory of Fluorine and Silicon for Energy Materials and Chemistry of Ministry of Education, 330022, Nanchang, Jiangxi, P. R. China.
State Key Laboratory of Structural Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, 350002, Fuzhou, Fujian, P. R. China.
Angew Chem Int Ed Engl. 2024 Oct 24;63(44):e202407305. doi: 10.1002/anie.202407305. Epub 2024 Sep 23.
Metal halide perovskite ferroelectrics combining spontaneous polarization and excellent semiconducting properties is an ideal platform for enabling self-driven X-ray detection. However, achievements to date have been only based on uniaxiality, which increases the complexity of device fabrication. Multi-axial ferroelectric materials have multiple equivalent polarization directions, making them potentially amenable to multi-axial self-driven X-ray detection, but the report on these types of materials is still a huge blank. Herein, a high-quality (BA)(EA)PbI (1) biaxial ferroelectric single crystal was successfully grown, which exhibited significant spontaneous polarization along the c-axis and b-axis. Under X-ray irradiation, bulk photovoltaic effect (BPVE) was exhibited along both the c-axis and b-axis, with open circuit voltages (V) of 0.23 V and 0.22 V, respectively. Then, the BPVE revealed along the inversion of polarized direction with the polarized electric fields. Intriguingly, due to the BPVE of 1, 1 achieved multi-axial self-driven X-ray detection for the first time (c-axis and b-axis) with relatively high sensitivities and ultralow detection limits (17.2 nGy s and 19.4 nGy s, respectively). This work provides a reference for the subsequent use of multi-axial ferroelectricity for multi-axial self-driven optoelectronic detection.
结合自发极化和优异半导体性能的金属卤化物钙钛矿铁电体是实现自驱动X射线检测的理想平台。然而，迄今为止的成果仅基于单轴性，这增加了器件制造的复杂性。多轴铁电材料具有多个等效极化方向，使其有可能适用于多轴自驱动X射线检测，但关于这类材料的报道仍然是一个巨大的空白。在此，成功生长出高质量的(BA)(EA)PbI (1)双轴铁电单晶，其沿c轴和b轴均表现出显著的自发极化。在X射线照射下，沿c轴和b轴均表现出体光伏效应（BPVE），开路电压（V）分别为0.23 V和0.22 V。然后，BPVE随着极化电场沿极化方向的反转而呈现。有趣的是，由于1的BPVE，1首次实现了多轴（c轴和b轴）自驱动X射线检测，具有相对较高的灵敏度和超低的检测限（分别为17.2 nGy s和19.4 nGy s）。这项工作为后续利用多轴铁电性进行多轴自驱动光电检测提供了参考。
