Organic static induction transistor for color sensors

Copper phthalocyanine (CuPc) and merocyanine (MC) dyes show p-type semicond ucting properties and have different absorption peaks in the visible spectr al range. We fabricated new organic color sensors with the static induction transistor (SIT) structure using these dyes and investigated their photoel ectric properties. The photocurrent from the source to the drain electrodes is controlled by the gate voltage, and the pinch-off gate voltage is chang ed drastically by illumination. These phenomena can be explained in terms o f the field-dependent and wavelength-dependent quantum efficiency in an org anic SIT.