Synthesis of Aroylbenzoate-Based Push-Pull Molecules for OFET Applications

Solution-processable organic semiconductors have attracted great attention in recent years, because of their performance and reliability in potential applications. Here, we report the solution processable donor-acceptor (D-A) conjugated molecules comprised of aroylbenzoate as acceptor, triarylamine or methoxyphenyl groups as donor and ethynyl spacer. Molecules with triarylamine donor exhibited strong absorption at 350-380 nm. HOMO levels around 5.5 eV ensures low barrier for hole injection. Optimized geometry and charge distribution over the molecules are visualized by density functional theory (DFT). Organic field effect transistors of these molecules are fabricated with bottom gate-top contact configuration. The devices exhibited charge carrier mobility up to 2.16 x 10(-3) cm(2) V-1 s(-1) and ON/OFF of 10(4) with low threshold voltage of -3.2 V.