Small-molecule solar cells based on zinc phthalocyanine (ZnPc) fullerene (C-60) heterojunction structure were fabricated with a laminated top electrode. The photovoltaic (PV) performances of the laminated devices with and without a bathocuproine (BCP) buffer layer were investigated by comparing with those of the conventional devices with the top electrode deposited by successive vacuum evaporations. Improved PV performances by insertion of BCP buffer layer were observed with both the evaporation- and the lamination-type devices. These results suggest that the formation of the cathode-induced defect states below the lowest unoccupied molecular orbital (LUMO) of BCP would not be necessarily requisite for efficient charge transport across the BCP layer.