To enhance OPV performance, a novel module-fabrication process was developed. Chlorobenzene and acetone were employed to wash away unnecessary residual high-resistance materials after full modules were fabricated. Monolithic interconnecting electrode lines between the anode and the cathode were formed using a dispenser after wash process. The wash process allowed for minimization of interconnection resistance and enhancement of power conversion efficiency. Module efficiency changes were also studied by varying the coating conditions of PEIE. The power conversion efficiency increased as a result of the wash-off process compared with modules fabricated via conventional processes. The power conversion efficiency enhancement was attributed to increases in open circuit voltage and fill factor. Applying this wash-off process to larger-area OPV modules is expected to be effective for further enhancing power conversion efficiency. (c) 2015 Elsevier B.V. All rights reserved.