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

作者：Isherwood Patrick J M^*; Butler Keith T; Walsh Aron; Walls John M

来源：Journal of Applied Physics, 2015, 118(10): 105702.

DOI：10.1063/1.4929752

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.

• 出版日期2015-9-14