Two small semiconductor molecules based on diketopyrrolopyrrole (DPP) and hemi-isoindigo units with and without fluorination were designed and synthesized for investigating the solution-processed organic field-effect transistors (OFETs). Bottom-gate/top-contact (BG/TC) OFETs were fabricated to explore carrier transport characteristics. The combination of density functional theory (DFT) calculation, grazing incidence X-ray diffraction (GIXD), and atomic force microscopy (AFM) allowed us to understand the relationship between structures and properties. The results revealed the small molecule with fluorination (DPP-T-FMI) exhibited better field-effect performance owing to the improved crystal packing and morphology of thin-films.

设计并合成了两种基于二酮吡咯并吡咯 ( DPP ) 和半异靛蓝单元的小半导体分子，用于研究溶液处理的有机场效应晶体管 (OFET)。制造底栅/顶接触 (BG/TC) OFET 以探索载流子传输特性。密度泛函理论 (DFT) 计算、掠入射 X 射线衍射 (GIXD) 和原子力显微镜 (AFM) 的结合使我们能够了解结构和性能之间的关系。结果表明，由于改善了薄膜的晶体堆积和形态，氟化小分子（DPP-T-FMI）表现出更好的场效应性能。