Photo-Electrochemical Performance Of Interpenetration-Structured Heterojunction By Overlapping Cuo And Zno Nanorod Arrays

A facile design of interpenetration-structured p-n heterojunction device was fabricated by overlapping p-CuO and n-ZnO nanorod arrays directly. The design showed weak photovoltaic performance. However, the p-n heterojunction system shows the significantly enhanced photocurrent and photovoltage with the assistance of filling electrolyte (I-3 (-)/I-). The charge carrier dynamics indicates that the reversible redox couple (I-3 (-)/I-) electrolyte can promote electron transfer from CuO to ZnO better, i.e. better charge separation efficiency and photocurrent.