Doping Effect of Silole Derivative in Coumarin 30 Photoconductive Film

Abstract

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 × 10⁻⁹ A/cm² 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.

Keywords:

• coumarin 30
• image sensor
• organic photoconductor
• silole; co-evaporation