Journal
JOURNAL OF PHYSICAL CHEMISTRY LETTERS
Volume 1, Issue 21, Pages 3195-3199Publisher
AMER CHEMICAL SOC
DOI: 10.1021/jz1011725
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Funding
- Science Foundation Ireland [06/IN.1/192, 06/IN.1/192/EC07]
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CuAlO2 is a prototypical delafossite p-type transparent conducting oxide (TCO). Despite this many fundamental questions about its band structure and conductivity remain unanwered. We utilize the screened hybrid exchange functional (HSE06) to investigate defects in CuAlO2 and find that copper vacancies and copper on aluminium antisites will dominate under Cu-poor/Al-poor conditions. Our calculated transitions levels are deep in the band gap consistent with experimental findings, and we identify the likely defect levels that are often mistaken as indirect band gaps. Finally, we critically discuss delafossite oxides as TCO materials.
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