Abstract
The heterojunction composed of p-type Cu2O film and n-type ZnO nanorod arrays was fabricated by using hydrothermal method. The Cu2O film with a thickness of 1.5 μm and a preferential (111) orientation grew on the ZnO nanorod arrays with length of around 1 μm. The hydrothermal growth approach of Cu2O/ZnO heterojunction was analyzed by characterizing the samples prepared with different aging times. Typical solar cell behavior of the Cu2O/ZnO heterojunction was evaluated, with the short circuit current density (J sc) of $7.8~\mathrm{mA/cm}^{2}$ , the open circuit voltage (V oc) of 0.36 V, and the fill factor (FF) of 0.31. Owing to the large J sc of the heterojunction cell, its photovoltaic conversion efficiency (PCE) was found to be 0.86 %. This study demonstrates that the hydrothermal method is a promising technique for a large-scale fabrication of low-cost heterojunction, which is expected to have wide application in solar energy field.
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