Copper phthalocyanine/C-60/2,9-dimethyl-4,7-diphenyl-1,10-phen-anthroline/Ag heterojunction organic solar cells are grown on low-cost SnO2-F-coated glass using organic vaporphase deposition (see figure). The bulk heterojunction (BHJ) solar cell with nanoscale CuPc protrusions shows a 2.5 % power-conversion efficiency under 1 sun illumination. The high efficiency in BHJ solar cells is attributed to the increased exciton dissociation efficiency at the CUPC/C60 interface.