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Large Optical Anisotropy in Two-Dimensional Perovskite [CH(NH2)2][C(NH2)3]PbI4 with Corrugated Inorganic Layers
journal contribution
posted on 2020-03-16, 12:03 authored by Chen Fang, Meng Xu, Jiaqi Ma, Jun Wang, Long Jin, Ming Xu, Dehui LiOptical
anisotropy plays an indispensable role in a variety of
optical components. Organic halide perovskites often rely on artificially
oriented nanostructures to enhance optical anisotropy due to their
in-plane isotropic crystal structure, which results in unnecessary
optical losses and fabrication difficulties. Here, we report the large
optical anisotropy in two-dimensional perovskite [CH(NH2)2][C(NH2)3]PbI4 crystals.
Without specially designing their morphology, we achieved a large
photoresponse linear dichroic ratio of 2 and a photoluminescence linear
dichroic ratio of 4.7. Furthermore, we identified that the polarization
orientation is parallel to the corrugated inorganic layers on every
crystal plane by density functional theory calculations. The anisotropy
of the ab-plane and ac-plane changes in opposite trend with temperature,
suggesting that the perovskite can selectively generate polarized
light or unpolarized light from different crystal planes by tuning
the temperature. Our studies provide a new platform toward two-dimensional
perovskite-based optical polarization devices.