Abstract
The power conversion efficiencies of electrodeposited Cu2O/ZnO p-n junction based solar cells are significantly improved by sandwiching a layer of spin-coated CdS nanowires (NWs) in between the electrochemically deposited Cu2O and ZnO layers. With the inclusion of the CdS NWs, there is observed a 5 fold improvement in the conversion efficiency, from 0.12% to 0.6%, as compared with that of the plain Cu2O/ZnO cell. The improvement is attributed to the enlarged p-n interface area and enhanced light harvesting, charge separation, and electron transport made possible by incorporating the single crystalline, relatively low band gap CdS NWs.
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