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Anisotropy in a 2D Perovskite Ferroelectric Drives Self-Powered Polarization-Sensitive Photoresponse for Ultraviolet
Lei Lu1, Wen Weng1,2, Yu Ma1,2
1State Key Laboratory of Structure Chemistry, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian, 350002, P. R. China.
Abstract:
Polarized-light detection in the deep ultraviolet solar-blind region is indispensable for optoelectronic applications. 2D hybrid perovskite ferroelectrics with inherent anisotropy and bulk photovoltaic effect (BPVE) have become a robust candidate in this portfolio. We here report a wide band-gap 2D perovskite ferroelectric, (isobutylammonium)2 (methylamium)Pb2 Cl7 (1), in which the BPVE behaves as self-driving source for solar-blind ultraviolet polarized-light detection. It exhibits a large dichroism ratio (≈15.7) and superior BPVE-directed photocurrent (≈3.6 μA cm-2 , under 266 nm). These attributes facilitate excellent self-powered polarized-light detection of high on/off contrast (≈103 ) and polarization ratio (≈2.5), beyond those of inorganic oxides (e.g., ZnO, 1.47; GaN, 1.38). This study highlights potential of 2D perovskite ferroelectrics for new optoelectronic application.
