Polarization‐Sensitive Photodetector Using Patterned Perovskite Single‐Crystalline Thin Films

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 perovskite...

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Bibliographic Details
Published in:Advanced optical materials 2021-09, Vol.9 (17), p.n/a
Main Authors: Zhang, Jinshuai, Zhao, Jiajia, Zhou, Yongfeng, Wang, Yufei, Blankenagel, Karen Silva, Wang, Xuechun, Tabassum, Madeeha, Su, Lei
Format: Article
Language:English
Subjects:
Anisotropy
Crystal defects
Crystal structure
Crystal surfaces
Grain boundaries
Induced polarization
lead halide perovskites
Linear polarization
Materials science
nanopatterns
Nanowires
Optics
Optoelectronic devices
Perovskites
photodetectors
Photometers
polarization
Quantum efficiency
Sensitivity
Single crystals
Thin films
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Summary: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 MAPbBr3 (MA=CH3NH3+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. Polarization‐sensitive photodetection based on surface nanopatterned CH3NH3PbBr3 monocrystalline thin films is reported. Although the monocrystalline thin film exhibits weak in‐plane anisotropy under 532 nm illumination, the surface grating nanopatterns lead to polarization sensitivity of ≈2.2 in photodetection, as a result of the enhanced light absorption by the surface grating according to the polarization direction of the light.
ISSN:2195-1071
2195-1071
DOI:10.1002/adom.202100524