Organic static induction transistor for color sensors

Copper phthalocyanine (CuPc) and merocyanine (MC) dyes show p-type semiconducting properties and have different absorption peaks in the visible spectral range. We fabricated new organic color sensors with the static induction transistor (SIT) structure using these dyes and investigated their photoelectric properties. The photocurrent from the source to the drain electrodes is controlled by the gate voltage and the pinch-off gate voltage is changed drastically by illumination. These phenomena can be explained in terms of the field-dependent and wavelength-dependent quantum efficiency in an organic SIT.