Effect of pentacene deposition rate on device characteristics of top contact organic thin film transistors

Pentacene based organic thin film transistor (OTFT) is viable low cost alternative to amorphous silicon based thin film transistor. This is due to comparable mobility of pentacene with amorphous silicon. In this paper, we present the transistor characteristics of top contact pentacene based OTFT as a function of pentacene deposition rate. For deposition at 70degC on silicon oxide surface, morphology and field effect mobility are very sensitive to deposition rate - mobility changes by four orders of magnitude as deposition rate changes from 0.5 to 1.5 nm/min.