Polymorphism of organic semiconductor films is of key importance for the performance of organic thin film transistors (OTFTs). Herein, we demonstrate that the polymorphism of solution-processed organic semiconductors in thin film transistors can be controlled by finely tuning the surface nanostructures of substrates with self-assembled monolayers (SAMs). It is found that the SAMs of 12-cyclohexyldodecylphosphonic acid (CDPA) and 12-phenyldodecylphosphonic acid (PhDPA) induce different polymorphs in the dip-coated films of 2-dodecyl[1]benzothieno[3,2-b][1]benzothiophene (BTBT-C12). The film of BTBT-C12 on CDPA exhibits field effect mobility as high as 28.1 cm² V⁻¹ s⁻¹ for holes, which is higher than that of BTBT-C12 on PhDPA by three times. The high mobility of BTBT C12 on CDPA is attributable to the highly oriented films of BTBT C12 with a reduced in-plane lattice and high molecular alignment.

有机半导体膜的多态性对于有机薄膜晶体管（OTFT）的性能至关重要。在这里，我们证明了可以通过微调具有自组装单层（SAM）的基板的表面纳米结构来控制薄膜晶体管中溶液处理的有机半导体的多态性。发现12-环己基十二烷基膦酸（CDPA）和12-苯基十二烷基膦酸（PhDPA）的SAM在2-十二烷基[1]苯并噻吩并[3,2- b ] [1]苯并噻吩的浸涂膜中诱导出不同的多晶型。（BTBT-C12）。CDPA上的BTBT-C12薄膜表现出高达28.1 cm ² V ^-1 s ^-1的场效应迁移率孔，比PhDPA上的BTBT-C12高三倍。BTBT C12在CDPA上的高迁移率可归因于BTBT C12的高取向膜，具有减少的面内晶格和高分子排列。