小分子/聚合物混合网络的构筑及其晶体管性能研究

Small molecule/polymer blend networks, which are easy to form film, highly stable, and solution-processable, are ideal candidate as the active layers of transistors (core units in large-area displays, flexible electronics, and sensors). However, the transistor performance strongly depends on the structure of blend networks, and the formation of blend networks is via a self-assembling process in nature. In this project, the self-assembly of small-molecule semiconductors in polymer solution is investigated as well as in conventional solvents. The effects of contents and molecular weights of polymer on network structures are revealed, which provides experimental and theoretical guide for the controllable fabircation of blend networks. Based on the above results, the correlation between network structures and transistor performance is also explored, in particular, for those with vertical phase separation.

小分子/聚合物混合网络具有成膜性好、稳定性高、可溶液加工等优点，是构筑晶体管(大面积显示、柔性电子和传感器的核心元件)的理想有源层。而晶体管性能的高低取决于混合网络的结构，其形成在本质上是一个自组装过程。本项目正是基于这一背景，以可溶性稠环化合物为主要研究对象，比较研究其在常规溶剂和聚合物中的自组装行为，揭示聚合物的种类、聚合度等对网络结构的影响规律，为小分子/聚合物网络的可控制备提供实验和理论依据。在此基础上，比较研究混合网络的结构与晶体管性能的关系，重点考察具有垂直相分离的混合网络，探索其在高性能晶体管中的潜在应用。

本项目通过小分子单晶纳米结构的自组装调控，实现了小分子/聚合物交联网络有源层的制备，解决了有机薄膜晶体管的有源层高结晶性、高稳定性、柔性及良好成膜无法兼容的问题。详细地研究了自组装条件对交联膜微结构，相分离等行为及晶体管性能的的影响。结果表明溶剂组成、基底及退火温度是影响其关键因素。最后阐明了交联膜的微结构特性与晶体管性能的关联，为溶液化高性能晶体管的制备奠定了实验基础。

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