Monolayer‐to‐Multilayer Dimensionality Reconstruction in a Hybrid Perovskite for Exploring the Bulk Photovoltaic Effect Enables Passive X‐ray Detection

作者：Ji Chengmin; Li Yezhan; Liu Xitao; Wang Yaxing; Zhu Tingting; Chen Qin; Li Lina; Wang Shuao; Luo Junhua

来源：Angewandte Chemie, 2021, 133(38): 21138-21144.

DOI：10.1002/ange.202108145

• bulk photovoltaic effect
• dimensionality reconstruction
• ferroelectrics
• hybrid perovskites
• passive X-ray detection

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 (CH3OC3H9N)2PbBr4, we obtained a quasi‐two‐dimensional (Q‐2D) ferroelectric (CH3OC3H9N)2CsPb2Br7. 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?1?cm?2 at zero bias, which is even superior to the value of the state‐of‐the‐art α‐Se detector operated at relatively high bias.(#br)A quasi‐two‐dimensional ferroelectric (CH3OC3H9N)2CsPb2Br7 was successfully obtained by dimensionality reconstruction of a pure‐two‐dimensional monolayered perovskite (CH3OC3H9N)2PbBr4, which enables unprecedented passive X‐ray detection with an impressive sensitivity up to 410?μC?Gy?1?cm?2.

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