To address the scarcity of small molecule semiconductors capable of ambipolar charge injection/transport in field effect transistors, three new dithienonaphthothiadiazoles 10, 11 & 12 with fused donor/acceptor motif were synthesized. Their optical and electrochemical properties were investigated in parallel to DFT calculations, revealing the effects of ring connectivity and alkyl substitution on the electronics of the push–pull systems. Single-crystal X-ray analysis revealed a transition from a quasi-herringbone structure in 10 to slipped π-stacked structures in 11 and 12, which changes the exciton delocalization and charge transport pathways. Accordingly, while alkylated compounds 11 and 12 were insulating, ambipolar charge transport was achieved in field-effect transistor devices using 10 with balanced hole and electron mobilities of up to ∼0.02 cm2 V−1 s−1 in single-crystal devices.
为了解决场效应晶体管中缺乏能够实现双极性电荷注入/传输的小分子半导体的问题,合成了三种新的带有融合供体/受体基团的二苯并
萘噻二唑10、11和12。同时进行了DFT计算,探究了环连接性和烷基取代对推-拉体系电子性质的影响,并研究了它们的光学和电
化学性质。单晶X射线分析揭示了从10中的拟鱼骨结构到11和12中的滑移π堆积结构的转变,这改变了激子的离域和电荷传输途径。因此,尽管烷基化化合物11和12是绝缘的,但在使用10的场效应晶体管器件中实现了双极性电荷传输,单晶器件中的空穴和电子迁移率高达约0.02 cm² V⁻¹ s⁻¹。