ISSN:
1089-7550
Source:
AIP Digital Archive
Topics:
Physics
Notes:
Cd1−xNixTe nanostructured thin films have been deposited using the radio frequency sputtering technique. Films are formed by sphericallike microcrystallites with a broad grain size distribution. The measured nanocrystallite average diameters were 35, 30, and 26 nm corresponding to the films with Ni concentrations of 5%, 10%, and 15%, respectively. The film structure was zincblende, resembling the crystalline structure for bulk CdTe. Particle-size effects were observed in the optical absorption spectra. As the Ni content in the films increases, the grain size diminishes, and the optical band gap (Eg) energy shows a blue shift at a rate of about 7.5 meV/at. %, for Ni concentrations up to 15 at. %. Alloying effects additional to quantum confinement effects are discussed. The Eg shifts due to quantum confinement have been found to fall in the intermediate regime between strong and weak confinement. The quantum yield for the photoluminescence peak increases as the particle size decreases, probably as a result of exciton recombination enhancement due to better nanocrystallites quality.© 1997 American Institute of Physics.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1063/1.365602
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