Ji Chengmin, Li Yezhan, Liu Xitao, Wang Yaxing, Zhu Tingting, Chen Qin, Li Lina, Wang Shuao, 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.
Fujian Science & Technology Innovation Laboratory for Optoelectronic Information of China, Fuzhou, Fujian, 350108, China.
Angew Chem Int Ed Engl. 2021 Sep 13;60(38):20970-20976. doi: 10.1002/anie.202108145. Epub 2021 Aug 24.
Halide hybrid perovskites are attracting considerable attention as highly promising candidates for directly sensing X-ray radiation, but it is challenging to realize passive X-ray detection without an external power supply. However, the bulk photovoltaic effect (BPVE) in ferroelectrics promotes the independent separation of photoexcited carriers. Herein, by dimensionality reconstruction of a pure-two-dimensional (P-2D) monolayered perovskite (CH OC H N) PbBr , we obtained a quasi-two-dimensional (Q-2D) ferroelectric (CH OC H N) CsPb Br . Converting P-2D into Q-2D perovskite stimulates a significant BPVE associated with robust ferroelectricity, as well as an enhanced mobility lifetime product. These features show the potential of the first passive X-ray detector based on ferroelectrics with an impressive sensitivity up to 410 μC Gy cm at zero bias, which is even superior to the value of the state-of-the-art α-Se detector operated at relatively high bias.
卤化物混合钙钛矿作为直接探测X射线辐射的极具潜力的候选材料正吸引着相当多的关注，但在没有外部电源的情况下实现被动X射线检测具有挑战性。然而，铁电体中的体光伏效应（BPVE）促进了光激发载流子的独立分离。在此，通过对纯二维（P-2D）单层钙钛矿（CH₃OC₂H₅NH₃）PbBr₃进行维度重构，我们获得了准二维（Q-2D）铁电体（CH₃OC₂H₅NH₃）CsPb₂Br₅。将P-2D钙钛矿转变为Q-2D钙钛矿会激发与强铁电性相关的显著BPVE以及增强的迁移率寿命乘积。这些特性显示了首个基于铁电体的被动X射线探测器的潜力，其在零偏压下具有高达410 μC Gy⁻¹ cm⁻²的令人印象深刻的灵敏度，甚至优于在相对较高偏压下运行的最先进的α-Se探测器的值。
