Abstract：
:Indium tin oxide (ITO) is one of the most widely used transparent conductors in optoelectronic device applications. We investigated the optical properties of ITO thin films at high temperatures up to 800 °C using spectroscopic ellipsometry. As temperature increases, amorphous ITO thin films undergo a phase transition at ~ 200 °C and develop polycrystalline phases with increased optical gap energies. The optical gap energies of both polycrystalline and epitaxial ITO thin films decrease with increasing temperature due to electron-phonon interactions. Depending on the background oxygen partial pressure, however, we observed that the optical gap energies exhibit reversible changes, implying that the oxidation and reduction processes occur vigorously due to the low oxidation and reduction potential energies of the ITO thin films at high temperatures. This result suggests that the electronic structure of ITO thin films strongly depends on temperature and oxygen partial pressure while they remain optically transparent, i.e., optical gap energies > 3.6 eV.
journal_name
Sci Repjournal_title
Scientific reportsauthors
Kim J,Shrestha S,Souri M,Connell JG,Park S,Seo Adoi
10.1038/s41598-020-69463-4subject
Has Abstractpub_date
2020-07-27 00:00:00pages
12486issue
1issn
2045-2322pii
10.1038/s41598-020-69463-4journal_volume
10pub_type
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