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Cross-sectional schematic (a), AFM image of the surface (b), cross section TEM image (c) and, SIMS depth profile of Cd element (d) of the ZnCdO/ZnO SQW.
PL spectra of ZnCdO/ZnO SQW measured at (a) room temperature and (b) 10 K. The inset of (b) is high resolution PL spectrum of the sample.
(a) Normalized PL spectrum (linear scale) of the ZnCdO/ZnO SQW at various temperatures. The close circles and the solid line indicate the peak evolution of the QW-related emission and the emission of ZnO barriers, respectively. (b) Temperature dependence of the spectra (logarithmic scale) of LO-phonon replicas of SQW, namely the designated area in (a).
(a) Temperature dependent peak positions of , , SQW, and its 1LO-, 2LO-, and 3LO-phonon replicas. The solid line is the fitting curve of the experimental data according to Varshni equation. (b) Dependence of the integrated PL intensity on the reciprocal of temperature, the solid curve is the corresponding fit based on Eq. (1). The inset of (b) is the evolution of the FWHM of the QW PL band with temperature.
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