I-V characteristic curves of the ZnO/CuO CH with PR. In the dark (black line) and under light (424 nm) illumination (red line). The inset shows the I-V curves of the Ag-CuO film (black line) and ITO-ZnO NWs (blue line).
Wu et al. Nanoscale Research Letters 2013 8:387 doi:10.1186/1556-276X-8-387