Anomalies in the optical properties of nanocrystalline copper oxides CuO and Cu{sub 2}O near the fundamental absorption edge
- Russian Academy of Sciences, Institute of Metal Physics, Ural Division (Russian Federation)
- Ural State University (Russian Federation)
- Zababakhin All-Russia Research Institute of Technical Physics, Russian Federal Nuclear Center (Russian Federation)
A 0.1-0.15-eV displacement of the fundamental absorption edge in the optical absorption spectra of nanocrystalline oxide n-CuO (relative to the position of the fundamental absorption edge in the spectra of CuO single crystals) towards lower energies (red shift) is observed against the background of strong blurring. Nanocrystalline n-Cu{sub 2}O exhibits a displacement of the fundamental absorption edge towards higher energies (blue shift) by approximately 0.35 eV. The size of crystallites in n-CuO and n-Cu{sub 2}O ranges from 10 to 90 nm. The blue shift of the fundamental absorption edge of n-Cu{sub 2}O is typical of classical wide-gap semiconductors and can be explained by size quantization upon a change in the particle size. The anomalous red shift of the fundamental absorption edge of the strongly correlated nanocrystalline oxide n-CuO can be attributed to the highly defective structure of n-CuO, anomalies in the electronic structure of strongly correlated compounds based on 3d metals, and their tendency to electronic phase separation with the formation of metal-like inclusions.
- OSTI ID:
- 21067737
- Journal Information:
- Journal of Experimental and Theoretical Physics, Vol. 102, Issue 2; Other Information: DOI: 10.1134/S1063776106020105; Copyright (c) 2006 Nauka/Interperiodica; Article Copyright (c) 2006 Pleiades Publishing, Inc; Country of input: International Atomic Energy Agency (IAEA); ISSN 1063-7761
- Country of Publication:
- United States
- Language:
- English
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