Journal
ANGEWANDTE CHEMIE-INTERNATIONAL EDITION
Volume 60, Issue 38, Pages 20970-20976Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/anie.202108145
Keywords
bulk photovoltaic effect; dimensionality reconstruction; ferroelectrics; hybrid perovskites; passive X-ray detection
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Funding
- National Natural Science Foundation of China [21975258, 21833010, 21875251, 21921001, 21971238]
- Key Research Program of Frontier Sciences of the Chinese Academy of Sciences [ZDBS-LY-SLH024]
- NSF of Fujian Province [2018H0047]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB20010200]
- Youth Innovation Promotion of CAS [2019301, 2020307]
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The conversion of two-dimensional perovskite into quasi-two-dimensional ferroelectric stimulates a significant bulk photovoltaic effect associated with robust ferroelectricity and enhanced charge carrier mobility lifetime product. This feature shows the promise of the fabrication of the first passive X-ray detector based on ferroelectrics with impressive sensitivity.
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)(2)PbBr4, we obtained a quasi-two-dimensional (Q-2D) ferroelectric (CH3OC3H9N)(2)CsPb2Br7. 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 promise of the fabrication of the first passive X-ray detector based on ferroelectrics with an impressive sensitivity up to 410 mu C Gy(-1) cm(-2) at zero bias, which is even superior to the value of the state-of-the-art alpha-Se detector operated at relatively high bias.
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