Volume 123, Number 2, July 2018
|Number of page(s)||7|
|Section||Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties|
|Published online||24 August 2018|
Ionicity of ZnO —A key system for transparent conductive oxides
1 Angewandte Physik-Sensorik, BTU Cottbus-Senftenberg - Konrad-Wachsmann-Allee 17, 03046 Cottbus, Germany
2 Institut für Physik, Humboldt-Universität zu Berlin - Newtonstr. 15, 12489 Berlin, Germany
Received: 11 March 2018
Accepted: 28 July 2018
The electronic structure of ZnO is dominated by coexisting electron and ionic states/bonds caused by charge polarization and self-trapping phenomena of the valence charges. Their interplay manifests itself in intrinsic electronic defects which have different degree of spatial localization and electronic correlation. The relative abundance of intrinsic defects can be determined by the ionicity factor and its value can be derived from three independent experimental procedures in a consistent way. This approach also explains the complex satellite features in the XPS and XAS data. Ionicity and satellite formation are two experimental findings which can be explained consistently in the same context of mixed-atomic valence states and intrinsic electronic defects.
PACS: 71.20.-b – Electron density of states and band structure of crystalline solids / 79.60.-i – Photoemission and photoelectron spectra / 72.20.-i – Conductivity phenomena in semiconductors and insulators
© EPLA, 2018
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