Polymer Solar Cells Using a PEDOT:PSS/Cu Nanowires/PEDOT:PSS Multilayer as the Anode Interlayer**Supported by the Tianjin Natural Science Foundation under Grant Nos 13JCYBJC18900, 12JCQNJC01300 and 13JCZDJC26700, the Ministry of Science and Technology of China under Grant No 2013AA014201, and the Tianjin Key Discipline of Material Physics and Chemistry.

Abstract

We compare the electrical, optical, and surface properties of the PEDOT:PSS/Cu nanowires (Cu NWs)/PEDOT: PSS (PCP) multilayer for organic solar cells. It is demonstrated that the electrical and optical properties of the PEDOT could be improved by the insertion of a Cu NW layer due to its very low resistivity and surface morphology. The organic bulk heterojunction solar cell fabricated on the multilayer exhibits a higher power conversion efficiency than devices based on the PEDOT:PSS or PEDOT:PSS/Cu NWs layer. Moreover, the PCP multilayer can improve cell-performances such as a fill factor and the internal resistance in the device due to horizontally well-aligned Cu NWs. The results suggest that the PCP multilayer is a promising low-cost and low-temperature processing buffer layer candidate for low-cost organic photovoltaics.