Optical and resistance switching properties in the Ag/ZnO/Pt structure were investigated. Two types of resistance switching (bipolar and monopolar) were observed. Photoluminescence measurements showed dissimilar emission spectra for the each type of switching that might be explained by different processes occurred during resistance switching. In case of the bipolar resistance switching, the change in the ultraviolet part of spectrum was observed and it was attributed to Ag+ ions migration. On the other hand, the monopolar switching demonstrated the changes in the visible luminescence emission that could be, in turn, interpreted by the generation/recovery of oxygen vacancies.
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Yalishev et al. (2011) studied this question.
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