基于吡咯并吡咯二酮的有机半导体的场效应晶体管研究

【作者】 江昊；

【导师】 陈红征； 李寒莹；

【作者基本信息】 浙江大学 ， 高分子材料， 2013， 硕士

【摘要】 近年来,有机场效应晶体管(OFET)吸引了工业界和学术界的关注。由于具有低成本、柔性、易加工等特性,OFET在微电子领域拥有广泛的应用前景,可以用于射频商标、柔性显示以及传感器等,随着其性能的不断提高,OFET离商业化应用越来越近。除此之外,作为载流子迁移率的有效测试方法之一,OFET还可以用于研究半导体的载流子传输特性。作为结构单元,吡咯并吡咯二酮(DPP)可以用于构筑有机小分子半导体和聚合物半导体,这些半导体材料在场效应晶体管的应用方面具有很大的潜力。论文第一章综述了有机场效应晶体管的工作原理和器件结构,介绍了DPP以及有机单晶在有机场效应晶体管中的应用。论文第二章,我们将两种含不同长度烷基链的DPP有机半导体聚合物制备成了场效应晶体管并测试了其性能,从而研究DPP单元中酰胺氮上烷基链的长度对有机半导体迁移率的影响。论文第三章,我们采用含DPP的有机半导体PTEDPP制备了双极性的场效应晶体管,并通过退火以及改变成膜条件等工艺优化了器件。论文第四章,我们采用三种DPP的小分子衍生物制备了取向的有机晶体,对晶体进行了表征并制备成器件。得到的有机晶体显示出了最高为0.74cm2·V-1·s-1的空穴迁移率,比相应的薄膜器件高出两个数量级。这些研究有助于深入理解DPP有机半导体的分子结构与载流子传输的关系,为其高性能OFET器件的制备打下基础。更多还原

【Abstract】 In recent decades, organic field-effect transistors (OFETs) have attracted significant interest for their low-cost, flexible and large-area electronic applicationssuch as radio frequency identification (RF-ID) tags, flexible displays and sensors. Some prototypes of these products have been fabricated and are now getting close to the commercial market. Among π-conjugated systems, diketopyrrolopyrrole (DPP) has been gaining tremendous attention as a promising building block for organic electronic applications.In the first chapter, we summarizes the device structure and the working principle of organic field effect transistor. DPP and organic single crystals used in OFET applications are reviewed.In the second chapter, we examined the side chain effect on the mobility of DPP-based copolymers. OFET based on two DPP copolymers with alternating alkyl substituents were fabricated and tested.In the third chapter, we prepared ambipolar OFET with a DPP based polymer PTEDPP. The devices were optimized through the annealing process and changing the deposition conditionsIn the fourth chapter, we reported three DPP-based small molecules substituted by di(4-fluorophenyl), di(4-n-butyl-phenyl) or diphenyl groups. Aligned crystalline films of these molecules were grown from solutions at room temperature, exhibiting field-effect hole mobility as high as0.74cm2·V-1·s-1that is two order of magnitude higher than that of the spun films.更多还原