Dye-sensitized solar cells using novel aligned ZnO nanorod arrays on Sn-doped ZnO thin film

The Sn-doped ZnO thin films were prepared by Sol gel Spin coating technique on glass and ITO substrates with doped concentration of 0, 1 and 2 at%. The thin films particle sizes were decreased as a doping concentration increased as observed from FESEM images. The effect of seed layers on nanorod growth for DSSCs was investigated. We have found that the ZnO nanorod grown on 2.0 at% Sn-doped ZnO thin film exhibits a uniform distribution of aligned nanorods with hexagonal shape and their diameter is about 100nm in average. Therefore, the DSSCs fabricated at 2.0at% Sn-doped ZnO thin film with aligned ZnO Nanorod arrays grown have an improved of current density, fill factor, and conversion efficiency.