Quantum dots-docrated ZnO nanorods- based dye sensitized solar cells have also been tested and the following photoelectrochemical properties have been obtained; Voc (mV)=690, Jsc (µA/cm2)=620, FF (%)= 29.92, and η (%)=0.13 [34]. Also, doping with SnO2 was a way to improve the efficiency of ZnO [35].