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Polarization‐Sensitive Photodetector Using Patterned Perovskite Single‐Crystalline Thin Films
Author(s) -
Zhang Jinshuai,
Zhao Jiajia,
Zhou Yongfeng,
Wang Yufei,
Blankenagel Karen Silva,
Wang Xuechun,
Tabassum Madeeha,
Su Lei
Publication year - 2021
Publication title -
advanced optical materials
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.89
H-Index - 91
ISSN - 2195-1071
DOI - 10.1002/adom.202100524
Subject(s) - materials science , photodetection , responsivity , photodetector , optoelectronics , polarization (electrochemistry) , thin film , crystallite , anisotropy , perovskite (structure) , quantum efficiency , nanowire , optics , nanotechnology , crystallography , chemistry , physics , metallurgy
Hybrid organic–inorganic perovskite single crystals, compared with their polycrystalline counterparts in thin films, are free from grain boundaries and have fewer defects, and therefore are promising in high‐performance optoelectronic devices. Recently, the crystal‐structure anisotropy in perovskites has been utilized to achieve polarization‐sensitive photodetectors. Here, it is shown that under 532 nm linearly polarized illumination, although MAPbBr 3 (MA=CH 3 NH 3 +1 ) single crystals possess weak in‐plane anisotropy, nanogratings made on the crystal surface lead to high polarization photodetection sensitivity of ≈2.2 comparable with that of the isotropic perovskite crystals and nanowires, while enhancing both the photodetection responsivity and external quantum efficiency. The surface nanopattern induced polarization sensitivity may find interesting applications in future optoelectronic devices.