Piezo-phototronic effect enhanced visible/UV photodetector of a carbon-fiber/ZnO-CdS double-shell microwire

Fang Zhang, Simiao Niu, Wenxi Guo, Guang Zhu, Ying Liu, Xiaoling Zhang, Zhong Lin Wang

Research output: Journal PublicationArticlepeer-review

167 Citations (Scopus)

Abstract

A branched ZnO-CdS double-shell NW array on the surface of a carbon fiber (CF/ZnO-CdS) was successfully synthesized via a facile two-step hydrothermal method. Based on a single CF/ZnO-CdS wire on a polymer substrate, a flexible photodetector was fabricated, which exhibited ultrahigh photon responsivity under illuminations of blue light (1.11 × 105 A/W, 8.99 × 10-8 W/cm2, 480 nm), green light (3.83 × 10 4 A/W, 4.48 × 10-8 W/cm2, 548 nm), and UV light (1.94 × 105 A/W, 1.59 × 10-8 W/cm 2, 372 nm), respectively. The responsivity of this broadband photon sensor was enhanced further by as much as 60% when the device was subjected to a -0.38% compressive strain. This is because the strain induced a piezopotential in ZnO, which tunes the barrier height at the ZnO-CdS heterojunction interface, leading to an optimized optoelectronic performance. This work demonstrates a promising application of piezo-phototronic effect in nanoheterojunction array based photon detectors.

Original languageEnglish
Pages (from-to)4537-4544
Number of pages8
JournalACS Nano
Volume7
Issue number5
DOIs
Publication statusPublished - 28 May 2013
Externally publishedYes

Keywords

  • branched ZnO-CdS double-shell nanowire
  • carbon fiber
  • photodetector
  • piezo-phototronic effect
  • piezopotential

ASJC Scopus subject areas

  • Materials Science (all)
  • Engineering (all)
  • Physics and Astronomy (all)

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