期刊
ADVANCED MATERIALS
卷 32, 期 9, 页码 -出版社
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201905298
关键词
layered perovskites; nanowires; orientational order; photodetectors; solvent engineering
类别
资金
- National Natural Science Foundation [21703268, 21633014]
- Beijing Natural Science Foundation [2182081]
- MOST of China [2017YFA0204504, 2018YFA0208502]
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 x 10(4) A W-1 and detectivity exceeding 9.1 x 10(15) Jones.
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