Layered-Perovskite nanowires with long-range orientational order for ultrasensitive photodetectors

Yingjie Zhao, Yuchen Qiu, Hanfei Gao, Jiangang Feng, Gaosong Chen, Lei Jiang, Yuchen Wu

Research output: Contribution to journalArticleResearchpeer-review

33 Citations (Scopus)

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.

Original languageEnglish
Article number1905298
Number of pages9
JournalAdvanced Materials
Volume32
Issue number9
DOIs
Publication statusPublished - 5 Mar 2020
Externally publishedYes

Keywords

  • layered perovskites
  • nanowires
  • orientational order
  • photodetectors
  • solvent engineering

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