Conductive and transparent V-doped ZnO thin films grown by radio frequency magnetron sputtering

Shuhei Okuda, Takuya Matsuo, Hiroshi Chiba, Tatsuya Mori, Katsuyoshi Washio

Research output: Contribution to journalArticlepeer-review

25 Citations (Scopus)

Abstract

Transparent conductive films of vanadium (V)-doped zinc oxide (VZO) were deposited by radio frequency magnetron sputtering on quartz substrates using a ceramic ZnO target with V chips. The electric, optical and structural properties of VZO thin films (V concentration of 0-4 at.%) were investigated at various substrate temperatures (TSUB) from 200 to 600 °C. The resistivity sharply decreased by V doping, and the resistivity reached a minimum of about 5 × 10- 4 Ωcm and 1 × 10- 3 Ωcm for TSUB = 200 °C and 600 °C, respectively. It was almost constant up to V concentration of 1.0-1.5% and gradually increased at higher V concentration. The optical transmittance (λ = 500 nm) of VZO films (V = 0.9-1.1%) drastically degraded from about 80% to 40% for TSUB of below 225 °C while that of ZnO films was over 83% for TSUB of over 200 °C. From the dependence of growth rate and the expansion of c-axis lattice constant in the VZO film, the V configuration was considered to have a charge number of 3.

Original languageEnglish
Pages (from-to)197-202
Number of pages6
JournalThin Solid Films
Volume557
DOIs
Publication statusPublished - 2014 Apr 30

Keywords

  • Radio frequency magnetron sputtering
  • Transition metal
  • Transparent conducting oxide
  • Vanadium
  • ZnO

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films
  • Metals and Alloys
  • Materials Chemistry

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