Fabrication of a large-area Al-doped ZnO nanowire array photosensor with enhanced photoresponse by straining

Ruey Chi Wang, Hsin Ying Lin, Chao Hung Wang, Chuan Pu Liu

Research output: Contribution to journalArticlepeer-review

39 Citations (Scopus)

Abstract

The photosensing properties of flexible large-area nanowire (NW)-based photosensors are enhanced via in situ Al doping and substrate straining. A method for efficiently making nanodevices incorporating laterally doped NWs is developed and the strain-dependent photoresponse is investigated. Photosensors are fabricated by directly growing horizontal single-crystalline Al-doped ZnO NW arrays across Au microelectrodes patterned on a flexible SiO 2/steel substrate to enhance the transportation of carriers and the junction between NWs and electrodes. The Raman spectrum of the Al:ZnO NWs, which have an average diameter and maximum length of around 40 nm and 6.8 μm, respectively, shows an Al-related peak at 651 cm -1. The device shows excellent photosensing properties with a high ultraviolet/visible rejection ratio, as well as extremely high maximum photoresponsivity and sensitivity at a low bias. Increasing the tensile strain from 0 to 5.6% linearly enhances the photoresponsivity from 1.7 to 3.8 AW -1 at a bias of 1 V, which is attributed to a decrease in the Schottky barrier height resulting from a piezo-photonic effect. The high-performance flexible NW device presented here has applications in coupling measurements of light and strain in a flexible photoelectronic nanodevice and can aid in the development of better flexible and integrated photoelectronic systems.

Original languageEnglish
Pages (from-to)3875-3881
Number of pages7
JournalAdvanced Functional Materials
Volume22
Issue number18
DOIs
Publication statusPublished - 2012 Sep 25

All Science Journal Classification (ASJC) codes

  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics

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