Influence of hydrogen on electrical and optical properties of ZnO films
Kim, Y.
,
Karazhanov, S.Z.
,
Kim, W.
Physica status solidi (B) Basic Research,
Vol. 248, no. 7 (2011), 1702-1707
- Publ. year
- 2011
- Publ. type
- article
- Abstract
- Electrical and optical properties of H doped ZnO films have been studied experimentally for different H concentrations before and after annealing, as well as theoretically by first-principles calculations. It is found that electrical resistivity of the H doped ZnO increases when increasing the substrate temperature in the range 25–300 °C. Carrier concentration and mobility measured by Hall method in as-grown samples are larger than those of annealed ones. The short-wavelength edge of the transmission spectrum of annealed ZnO is found to shift toward lower energies compared to as-grown samples. The band gap estimated from the measured transmission spectra of as grown ZnO increases with increasing H concentration, thus demonstrating the Burstein–Moss effect. However, it decreases in samples annealed at 300 °C showing suppression of the Burstein–Moss effect. Possible defect models explaining the reason for the suppression are discussed. The results can be explained by formation of H2 molecules in annealed ZnO.
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