Organic Thin Film Phototransistor Based On Arylene Derivatives

The research and development of organic electronic has been impressive grown at last decade because of the cost effective and easy production in comparison with inorganic electronic. The one of organic electronic component is organic thin film phototransistors that are one of the most tremendous progress topics in semiconductor technologies because of their potential for use as low cost alternative to conventional amorphous silicon transistors. Three-terminal phototransistor is a key component for light detection and photoswitching in an optoelectronic circuit. We have prepared naphthalene bis benzimidazole (NBBI) thin-film photo-transistor with top contact/bottom gate geometry in order to sense visible light. The soluble dielectric that is poly-vinyl alcohol (PVA) was used to obtain high transparency of dielectric on indium tin oxide (ITO) to penetrate light through the device. The photosensing characteristics of NBBI based field effect transistor are investigated under 100 mW/cm2 illumination of visible light and dark. The mobility of NBI on PVA dielectric is measured as 10-5 cm2 V-1s-1.