Point defects and related properties of highly co-doped bixbyite In2O3
文献情報
J.-H. Hwang, D. R. Kammler
The method of co-doping has been employed to achieve and study the influence of high defect populations in bixbyite In2O3. Substantial metastable Sn-doping levels can be achieved in nanocrystalline In2O3 with associated co-doping by oxygen interstitials. The resulting electrical properties, diffraction data (X-ray and neutron), and EXAFS studies support the presence of 2 : 1 Sn-oxygen interstitial point defect clusters. Upon reduction, some of these clusters can be reduced to liberate donors and generate charge carriers. Extensive Cd/Sn co-substitution for indium in In2O3 has been achieved in equilibrium solid solutions. This self-compensated (isovalent) and relatively size-matched substitution reveals a tendency for off-stoichiometry in favor of donors, resulting in “self-doped” behavior irrespective of oxygen partial pressure. Ramifications of bixbyite defect structure for transparent electrode applications are discussed.
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