Control of polymorphism in solution-processed organic thin film transistors by self-assembled monolayers

• 来源期刊: 中国科学：化学（英文版）
• 年，卷（期）: 2020,（9）
• 所属期刊栏目: ARTICLES
• 页码范围: 1221-1229
• 页数: 9页
• 语种: 英文

摘要

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-C 12).The film of BTBT-C 12 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.