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Nature Research, Scientific Reports, 1(3), 2013

DOI: 10.1038/srep01714

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Exciton and core-level electron confinement effects in transparent ZnO thin films

Journal article published in 2013 by Adolfo A. Mosquera, David Horwat ORCID, Alexandr Rashkovskiy, Anatoly Kovalev, Patrice Miska ORCID, Dmitry Wainstein, Jose M. Albella, Jose L. Endrino
This paper is made freely available by the publisher.
This paper is made freely available by the publisher.

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Abstract

The excitonic light emission of ZnO films have been investigated by means of photoluminescence measurements in ultraviolet-visible region. Exciton confinement effects have been observed in thin ZnO coatings with thickness below 20 nm. This is enhanced by a rise of the intensity and a blue shift of the photoluminescence peak after extraction of the adsorbed species upon annealing in air. It is found experimentally that the free exciton energy (determined by the photoluminescence peak) is inversely proportional to the square of the thickness while core-level binding energy is inversely proportional to the thickness. These findings correlate very well with the theory of kinetic and potential confinements.