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

摘要

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 (μ_(FE)) value of 0.8 cm~2V~(-1)s~(-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 cm~2V~(-1)s~(-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.