Efficient organic photovoltaic tandem cells with poly (3-hexylthiophene): Fullerene active layers and transparent conductive oxide interlayer

Efficient organic photovoltaic tandem cells consist of P3HT:bis[60]PCBM and P3HT:[70]PCBM active layers and transparent conductive oxide interlayer are presented. A short circuit current and a conversion efficiency are estimated at more than 6 mA/cm2 and 5 % from optical simulation and optimization of the both active layer thicknesses. We clarify the almost same characteristics is achieved by the development of the nanoscale phase separation process of the active layers and the interlayer with the Indium. Tin Oxide (ITO) sandwiched by MoO₃ and LiF buffer layers. This is attributed to the improvement of carrier transport property in the active layers and interlayer.