Surface texturing of Ga-doped ZnO thin films by pulsed direct-current magnetron sputtering for photovoltaic applications

Y. C. Lin, W. T. Yen, C. H. Shen, P. C. Yao

Research output: Contribution to journalArticle

Abstract

In this study, Ga-doped ZnO (GZO) transparent conducting thin films were prepared by pulsed direct-current magnetron sputtering, providing good transparency and relatively low resistivity. The films were further etched in different aqueous solutions, 0.5% HCl, 5% oxalic acid, and 33% KOH, to modify their light-scattering properties. The results showed that film textured by 0.5% HCl aq for 30 s had total optical transparency of T total = 77.4% and haze value of H T = 0.16, with electrical resistivity of ρ = 4.9 × 10 -4 Ω-cm. For film textured in 5% oxalic acid solution for 75 s, the lowest electrical resistivity of 4.3 × 10 -4 Ω-cm was achieved with relatively high total optical transparency of T total = 75.1%, as well as a more ideal haze value of H T = 0.3. Film textured in 33% KOH solution for 135 s (500 nm thickness) had optimal electrical conductivity of 5.1 × 10 - Q-cm with T total = 75.6%, and a relatively low haze value of H T = 0.12. GZO film textured with an agitated etch of 5% oxalic acid at 300 K would be the most suitable candidate for photovoltaic applications due to its high transparency and good electrical conducting properties.

Original languageEnglish
Pages (from-to)442-450
Number of pages9
JournalJournal of Electronic Materials
Volume41
Issue number3
DOIs
Publication statusPublished - 2012 Mar 1

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All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Materials Chemistry

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