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以喷墨打印制备的共轭有机小分子2,7-二辛基[1]苯并噻吩并[3,2-b]苯并噻吩(C8-BTBT)作为有机薄膜晶体管(OTFT)的有源层,分别采用紫外臭氧处理、旋涂聚(4-乙烯基苯酚)(PVP)薄膜、自组装苯乙基三氯硅烷(PETS)单分子层和苯基三氯硅烷(PTS)单分子层四种衬底修饰方法,分析有机小分子薄膜生长过程中的衬底效应,及其对OTFT器件性能的影响。其中PVP或PETS修饰衬底具有疏水及低表面粗糙度的特性,在其上喷墨打印沉积的C8-BTBT单线条薄膜具有均匀性好、覆盖率高且有序堆积的结晶形貌,基于这种高质量薄膜制备的OTFT器件性能最优,饱和场效应迁移率达到1 cm2·V-1·s-1左右,开关比超过106。结果表明,对打印衬底进行疏水性处理及降低表面粗糙度是制备高性能共轭小分子OTFT器件的有效途径。
Conjugated organic small molecule 2,7-dioctyl [1] benzothieno [3,2-b] benzothiophene (C8-BTBT) prepared by inkjet printing was used as an active organic thin film transistor (OTFT) (PVP) films, self-assembled monolayers of phenethyltrichlorosilane (PETS) and monolayers of phenyltrichlorosilane (PTS) monolayers were prepared by UV-ozone treatment, spin- Substrate modification method to analyze the substrate effect during the growth of the organic small molecule film and its influence on the performance of the OTFT device. Among them, the PVP or PETS modified substrate has the characteristics of hydrophobicity and low surface roughness. The single line thin film of C8-BTBT deposited by inkjet printing has a crystalline morphology with good uniformity, high coverage and orderly accumulation based on this The OTFT device with high quality thin film has the best performance, and the saturation field effect mobility is about 1 cm2 · V-1 · s-1 with the switching ratio over 106. The results show that the hydrophobic substrate printing process and reduce the surface roughness of the preparation of high-performance conjugate small molecule OTFT devices an effective way.