Surface-state dependent optical properties of OH-, F-, and H-terminated 4H-SiC quantum dots

文献情報

出版日 2016-07-14

DOI 10.1039/C6CP03775E

インパクトファクター 3.676

著者

Amit K. Tiwari, J. P. Goss, M. J. Rayson, P. R. Briddon, A. B. Horsfall

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要旨

Density functional calculations are performed for OH-, F- and H-terminated 4H-SiC 10–20 Å diameter clusters to investigate the effect of surface species upon the optical absorption properties. H-termination results in a pronounced size-dependent quantum-confinement in the absorption, whereas F- and OH-terminations exhibit much reduced size dependent absorption due to surface states. Our findings are in good agreement with recent experimental studies, and are able to explain the little explored dual-feature photoluminescence spectra of SiC quantum dots. We propose that along with controlling the size, suitable surface termination is the key for optimizing optical properties of 4H-SiC quantum structures, such as might be exploited in optoelectronics, photovoltaics and biological applications.

掲載誌

Physical Chemistry Chemical Physics

CiteScore: 5.5

自己引用率: 10.3%

年間論文数: 3036

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