Abstract
The MgxZn1−xO/ZnO and MgxZn1−xO/CdyZn1−yO step quantum well structures have been produced by the pulsed laser deposition method. It has been established that the increase of the barrier height ratio for charge carriers in the conduction and valence bands upon transition from the active ZnO layers in the MgxZn1−xO/ZnO system to the active layers of CdyZn1−yO in a low-dimensional MgxZn1−xO/CdyZn1−yO system is associated with the fact that the electron concentration in CdyZn1−yO films rises with an increase in the cadmium content. As the result, the Fermi level is displaced to the bottom of the conduction band. In the range of quantum well widths from 1 to 12 nm the nonmonotonous growth of exciton and defect-related intensities in photoluminescence spectra is observed.
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This research was supported by the Russian Foundation for Basic Research Project Nos. 15-07-03331, 15-29-01171, 15-38-20369, 15-07-03580, 16-29-05385, 16-07-00842, 16-29-11719.
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This article is part of the Topical Collection on Laser technologies and laser applications.
Guest edited by José Figueiredo, José Rodrigues, Nikolai A. Sobolev, Paulo André and Rui Guerra.
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Lotin, A.A., Novodvorsky, O.A., Parshina, L.S. et al. Optical properties of ZnO-based step quantum wells. Opt Quant Electron 48, 318 (2016). https://doi.org/10.1007/s11082-016-0587-x
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DOI: https://doi.org/10.1007/s11082-016-0587-x