Enhanced mobility of organic thin film transistors by water absorption of collagen hydrolysate gate dielectric

Abstract

Collagen hydrolysate is a nature protein, which works well as the gate dielectric for organic thin film transistors (OTFTs). The pentacene OTFTs exhibit a field-effect mobility (μFE) value of 0.8 cm 2V-1s-1 and an on/off ratio of 105 in vacuum. The drain current is greatly enhanced and the μFE value increases to ca. 15.5 cm2V-1s-1 when OTFTs are exposed to air. The enhancement of μFE is attributed to the interaction of water and OH-groups in collagen hydrolysate in air ambient. © 2013 AIP Publishing LLC.