We fabricated flexible organic field-effect transistors (OFETs) based on a blend film composed of 6,13-bis(triisopropylsilylethynyl) pentacene (TIPS pentacene) as a π-conjugated small-molecule semiconductor and poly(methylmethacrylate) (PMMA) as a polymer insulator deposited on polyethylene naphthalate (PEN) films with Al bottom-gate electrodes. The blend films were prepared by using an electrostatic spray deposition (ESD) method with environmentally-friendly (i.e., non-aromatic and halogen-free) solvents of n-butyl acetate, acetone, and hexane. The TIPS pentacene and PMMA layers were stratified separately just after the film deposition (TIPS pentacene (top) and PMMA (bottom)). The phase-separated interface with molecular-level flatness was formed with the PMMA buffer layer inserted between the blend film and Al bottom-gate electrode, which leads to superior charge transport properties. Furthermore, the flexible OFETs with a sharp phase-separated interface demonstrated superior operational stability under applied mechanical strain.

我们基于由6,13-​​双（三异丙基甲硅烷基乙炔基）并五苯（TIPS并五苯）作为π共轭小分子半导体和聚甲基丙烯酸甲酯（PMMA）组成的混合膜制造了柔性有机场效应晶体管（OFET）。聚合物绝缘体，沉积在带有Al底栅电极的聚萘二甲酸乙二醇酯（PEN）薄膜上。通过使用静电喷雾沉积（ESD）方法与环境友好（即非芳香族和无卤素）乙酸正丁酯，丙酮和己烷的溶剂制备共混膜。刚沉积薄膜后，将TIPS并五苯和PMMA层分别分层（TIPS并五苯（上）和PMMA（下））。通过在共混膜和Al底栅电极之间插入PMMA缓冲层，形成具有分子级平坦度的相分离界面，这导致了优异的电荷传输性能。此外，具有尖锐的相分离界面的柔性OFETs在施加的机械应变下表现出卓越的操作稳定性。