Reduced electrical hysteresis of organic thin-film transistors based on small molecule semiconductor through an insulating polymer binder

摘要

The electrical stability of organic thin film transistors (OTFTs) based on 6, 13-bis(triisopropylsilylethynyl) (TIPS) pentacene were improved by blending poly(alpha-methylstyrene) (P alpha MS) binder with the TIPS-pentacene. The blended semiconducting film is vertically phase-separated, which forms a TIPS-pentacene rich region at top surface due to its lower surface energy than P alpha MS, inducing interface modification at semiconducting layer and dielectric layer. The modified interface induces an increase in charge current density and a decrease in charge trap density, leading to efficiently reduced electrical hysteresis and increased field-effect mobility.