We have fabricated heterojunction solar cells comprising active layers of
perylene diimide (PDI) or perylene bisbenzimidazole (CONPER, conjugated
perylene dye) as electron acceptor and ZnPC as donor. Bilayer solar cells
were produced by successive evaporation of zinc phthalocyanine (ZnPC) and
perylene diimide (PDI) or perylene bisbenzimidazole (CONPER) on glass
substrates coated with indium doped tin oxide. Active layers with
different thickness were evaporated. The bilayer cells were characterized
under simulated AM 1.5 illumination (100 mW/cm2). The best results were
obtained for the device structure of ITO/PEDOT/ZnPC (40 nm)/perylene
bisbenzimidazole (60 nm)/Al (70 nm).