Abstract

In situ growth of ZnO quantum dots (QDs) on the surface of multi-walled carbonnanotubes (MWCNTs) was presented, and their application in photovoltaic cells by usingflexible polyethylene terephthalate substrates was demonstrated. High-resolutiontransmission electron microscopy images revealed the conjugation of ZnO QDs withMWCNTs. Photoluminescence spectra indicated that the charge transfer efficiency at ZnOQD–MWCNT heterojunctions was above 90%, as confirmed by time-resolvedphotoluminescence measurements. Current–voltage measurements on the flexibledevices fabricated utilizing ZnO QD–MWCNT heterojunctions showed the robustnature of the ZnO QD–MWCNT-based photovoltaic cells and their potentialapplications as the power source for flexible hand-held consumer electronics.

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