A tunable amorphous p-type ternary oxide system: the highly mismatched alloy of copper tin oxide

Patrick J M Isherwood, Keith T. Butler, Aron Walsh, John M. Walls

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4 Citations (Scopus)
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Abstract

The approach of combining two mismatched materials to form an amorphous alloy was used to synthesise ternary oxides of CuO and SnO2. These materials were analysed across a range of compositions, and the electronic structure was modelled using density functional theory. In contrast to the gradual reduction in optical band gap, the films show a sharp reduction in both transparency and electrical resistivity with copper contents greater than 50%. Simulations indicate that this change is caused by a transition from a dominant Sn 5s to Cu 3d contribution to the upper valence band. A corresponding decrease in energetic disorder results in increased charge percolation pathways: a “compositional mobility edge.” Contributions from Cu(II) sub band-gap states are responsible for the reduction in optical transparency.

Original languageEnglish
Article number105702
JournalJournal of Applied Physics
Volume118
Issue number10
DOIs
Publication statusPublished - 14 Sep 2015

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