To obtain a highly sensitive and color selective photodetector for an image sensor, silole-derivative-doped coumarin 30 photoconductive films were fabricated. The silole-doped films showed excellent color selectivites only in the blue region of visible light. The dark current in the films decreased when the silole-doping concentration was increased, which reached down to 1.0 x 10(-9) A/cm(2) at -10 V in the 80%-silole-doped film. The 50%-silole-doped device showed high external quantum efficiency up to 60% along with the excellent color selectivity.