Enhanced photocurrent and stability of inverted polymer/ZnO-nanorod solar cells by 3-hydroxyflavone additive

► 3-hydroxyflavone (3-HF) as an additive in inverted P3HT:PCBM/ZnO solar cells. ► 3-HF enhances the photocurrent due to the improved carrier mobility. ► A power conversion efficiency of the device has improved from 2.57% to 3.05%. ► 3-HF can further lengthen the device lifetime by a factor of 3. ► Using 3-HF additive is an effective method to achieve high PCE with stable operation.