Transparent and conducting Zn-Sn-O thin films prepared by combinatorial approach

J. H. Ko, I. H. Kim, D. Kim, K. S. Lee, T. S. Lee, B. Cheong, W. M. Kim

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92 Citations (Scopus)

Abstract

Zn-Sn-O (ZTO) films with continuous compositional gradient of Sn 16-89 at.% were prepared by co-sputtering of two targets of ZnO and SnO 2 in a combinatorial method. The resistivities of the ZTO films were severely dependent on oxygen content in sputtering gas and Zn/Sn ratio. Except for the films with Sn 16 at.%, all the as-prepared films were amorphous and maintaining the stable amorphous states up to the annealing temperature of 450 °C. Annealing at 650 °C resulted in crystallization for all the composition, in which ZnO, Zn 2 SnO 4 , ZnSnO 3 , and SnO 2 peaks were appeared successively with increasing Sn content. Above Sn 54 at.%, the ZTO films were deduced to have a local structure mixed with ZnSnO 3 and SnO 2 phases which were more conductive and stable in thermal oxidation than ZnO and Zn 2 SnO 4 phases. The lowest resistivity of 1.9 × 10 -3 Ω cm was obtained for the films with Sn 89 at.% when annealed at 450 °C in a vacuum. The carrier concentrations of the amorphous ZTO films that contained Sn contents higher than 36 at.% and annealed at 450 °C in a vacuum were proportional to the Sn contents, while the Hall mobilities were insensitive to Sn contents and leveling in the range of 23-26 cm 2 /V s.

Original languageEnglish
Pages (from-to)7398-7403
Number of pages6
JournalApplied Surface Science
Volume253
Issue number18
DOIs
Publication statusPublished - 2007 Jul 15

Keywords

  • Amorphous
  • Thin film
  • Transparent conducting oxide
  • Zinc tin oxide

ASJC Scopus subject areas

  • Chemistry(all)
  • Condensed Matter Physics
  • Physics and Astronomy(all)
  • Surfaces and Interfaces
  • Surfaces, Coatings and Films

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    Ko, J. H., Kim, I. H., Kim, D., Lee, K. S., Lee, T. S., Cheong, B., & Kim, W. M. (2007). Transparent and conducting Zn-Sn-O thin films prepared by combinatorial approach. Applied Surface Science, 253(18), 7398-7403. https://doi.org/10.1016/j.apsusc.2007.03.036