Transient photoconductivity properties of tungsten oxide thin films prepared by spray pyrolysis

Jianhua Hao, S. A. Studenikin, Michael Cocivera

Research output: Journal article publicationJournal articleAcademic researchpeer-review

68 Citations (Scopus)

Abstract

Tungsten oxide (WO3) thin films were deposited by spray pyrolysis of an ammonium tungsten oxide solution. The effect of postannealing on the structural, transport and optical properties of the films has been studied. Under steady-state illumination, slow photoconductivity growth and relaxation transients were observed at room temperature. The contributions of carrier concentration and mobility to the photoconductivity were determined from photo-Hall and photoconductivity data. The transient photoconductivity was found to be mainly due to photoinduced excess electrons over a wide time range from 0.0 to 104s. This slow relaxation was characterized by two exponential decays indicating two discrete subband gap levels were involved. The fast photoconductivity relaxation over the time range from 10-8to 10-1s was more complicated and probably involved a distribution of subband gap states.
Original languageEnglish
Pages (from-to)5064-5069
Number of pages6
JournalJournal of Applied Physics
Volume90
Issue number10
DOIs
Publication statusPublished - 15 Nov 2001
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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