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Title: Layered-perovskite nanowires with long-range orientational order for ultrasensitive photodetectors
Authors: Zhao, Yingjie
Qiu, Yuchen
Gao, Hanfei
Feng, Jiangang
Chen, Gaosong
Jiang, Lei
Wu, Yuchen
Keywords: Science::Physics
Issue Date: 2020
Source: Zhao, Y., Qiu, Y., Gao, H., Feng, J., Chen, G., Jiang, L. & Wu, Y. (2020). Layered-perovskite nanowires with long-range orientational order for ultrasensitive photodetectors. Advanced Materials, 32(9), 1905298-.
Journal: Advanced Materials
Abstract: 2D layered metal-halide perovskites combine efficient exciton radiative recombination in crystal interior with long-distance free-carrier conduction at layer edges, which are promising candidates for realizing high-performance photovoltaic, light-emission and photodetection devices. The anisotropic electrical conductivity in layered perovskites imposes an additional requirement of orientational control for enabling favorable charge transport. However, rational fabrication of single-crystalline nanostructures with pure crystallographic orientation is still elusive. Herein, large-scale pure (101)-orientated 2D-perovskite single-crystalline nanowire arrays are realized by combining solvent engineering with the capillary-bridge lithography technique. Ordered nucleation at liquid-air interface and unidirectional growth along the dewetting direction are demonstrated by fluorescence microscopy and grazing-incidence X-ray scattering in discrete capillary bridges. In consideration of crystal interior exhibiting high resistance arising from the serial insulating organic barriers and ultrafast dissociation of excitons to generate long-lived free carriers at layer edges, ultrasensitive photodetectors are demonstrated with average responsivity exceeding 1.1 × 10⁴ A W⁻¹ and detectivity exceeding 9.1 × 10¹⁵ Jones.
ISSN: 0935-9648
DOI: 10.1002/adma.201905298
Schools: School of Physical and Mathematical Sciences 
Rights: © 2020 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
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