Surface Chemistry and Long-Term Stability of Amorphous Zn-Sn-O Thin Films

Stephanie L. Moffitt, D. Bruce Buchholz, Robert P. H. Chang, Thomas O Mason, Tobin J Marks, Michael J. Bedzyk, Qing Ma

Research output: Contribution to journalArticle

1 Citation (Scopus)

Abstract

Amorphous (a-) oxides form an important category of transparent conducting/semiconducting thin films used as electrodes and channel layers in thin film transistors. The compositional flexibility of amorphous states, through doping, makes it possible to fine-tune the electrical properties of films from conducting to semiconducting. However, surface chemistry and stability of these films are rarely addressed. Surface studies of amorphous materials, in general, are scarce due to disorder. Here, long-term surface stability of a-Zn-Sn-O films was investigated using grazing incidence X-ray absorption spectroscopy techniques. We present a detailed description of film surface structures and their evolution over time. It was found that the surface structure is, locally, a close analogue of the crystalline counterpart and that surface chemistry is governed by vacancies, strain, composition, and film density. It is shown that the long-term stability of a film is questionable when the film has a high Zn content and a low density.

Original languageEnglish
Pages (from-to)28151-28157
Number of pages7
JournalJournal of Physical Chemistry C
Volume122
Issue number49
DOIs
Publication statusPublished - Dec 13 2018

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Energy(all)
  • Physical and Theoretical Chemistry
  • Surfaces, Coatings and Films

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