Electrical and structural properties of organic thin-film transistor using very thin pentacene film

Carrier conduction in organic thin-film transistor (OTFT) was investigated by using pentacene OTFT with various film thicknesses from 1 to 50nm. The I_on of 3nm OTFT was higher than that of 50nm OTFT. The lateral distance between pentacene molecules decreased with decreasing film thickness. It is considered that the triangle potential was formed at interface between pentacene and SiO₂ in OTFT using very thin pentacene film. Therefore, the probability of the carrier scattering decreases for OTFT with 3nm thickness.