X-ray spectroscopic studies of the electronic structure of chromium-based p-type transparent conducting oxides

Article

关键词: LI-DOPED CR2MNO4;    THIN-FILMS;    RESONANT PHOTOEMISSION;    ELECTRICAL-CONDUCTION;    DELAFOSSITE STRUCTURE;    FIELD;    CU2O;    HETEROJUNCTIONS;    ABSORPTION;    SPECTRA;   

DOI  :  10.1103/PhysRevB.93.115302

来源: SCIE

【 摘 要 】

The valence band structure of p-type transparent oxides-crystalline MgxCr2-xO3 and nanocrystalline CuxCrOy-is analyzed as a function of incoming photon energy. The valence band of both p-type transparent conducting oxides shows striking similarities to measurements on crystalline CuCrO2:Mg with all films showing that chromium states compose the top of the valence band, suggesting that the valence-band structure is dominated by the presence of the Cr-O-6 octahedra. A comparison of the valence band between the best performing p-type, crystalline CuCrO2:Mg, with crystalline MgxCr2-xO3 and nanocrystalline CuxCrOy shows that the chromium 3d states are fixed irrespective of changes in long-range crystallographic order. This indicates little spatial overlap between adjacent Cr 3d states. This further confirms the conduction mechanism via hopping for chromium based p-type TCOs as the Cr 3d states are localized within the Cr-O-6 octahedra.

【 授权许可】

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