In this letter, we report on an efficient org. tandem solar cell combining a solid state dye-sensitized with a ZnPc / C 60 -based, vacuum deposited bulk heterojunction solar cell. Due to an effective serial connection of both subcells and to the complementary absorption of the dyes used, a power conversion efficiency of η p = ( 6.0 ± 0.1 )% was achieved under simulated 100 mW / cm 2 AM 1.5 illumination. The device parameters are V oc = ( 1360 ± 10 ) mV , I s.c. = ( 8.2 ± 0.1 ) mA / cm 2 and FF = ( 54 ± 1 ) % .