(Zn,Cd)O thin films for the application in heterostructures: Structural and optical properties

We report on (Zn,Cd)O thin films, grown by pulsed laser deposition on a-plane sapphire substrates with high Cd-contents up to 0.25. By incorporating Cd in ZnO and by applying a low growth temperature of about 300°C, the (Zn,Cd)O related luminescence redshifts to an energy of 2.46 eV as a result of t...

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Veröffentlicht in:Journal of applied physics 2012-11, Vol.112 (10)
Hauptverfasser: Lange, M., Dietrich, C. P., Brachwitz, K., Böntgen, T., Lorenz, M., Grundmann, M.
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Sprache:eng
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Zusammenfassung:We report on (Zn,Cd)O thin films, grown by pulsed laser deposition on a-plane sapphire substrates with high Cd-contents up to 0.25. By incorporating Cd in ZnO and by applying a low growth temperature of about 300°C, the (Zn,Cd)O related luminescence redshifts to an energy of 2.46 eV as a result of the large Cd-content of 0.25. The redshift of the bandgap energy was additionally proven by transmission measurements. By fitting the transmission curves, the spectra of the absorption coefficient and the index of refraction are calculated. The (Zn,Cd)O thin films are single phase and exhibit the wurtzite crystal structure. An increasing a- and c-lattice constant is observed with increasing Cd-content.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.4766905