Catalyst Transfer Polycondensation as a Tool to Access New n-Type Semiconducting Polymers and their Application in Organic Electronics

该项目涉及合成新型共轭聚合物，用于有机光伏电池（opv）和场效应晶体管（ofet）中的电子导体（n型材料）。近年来，出现了允许准活交叉偶联聚合（通常称为链生长催化剂转移缩聚，CTP）的制备方法，并允许获得全共轭棒-棒嵌段共聚物。利用CTP合成富电子空穴导电（p型）聚合物是一个非常发达和活跃的研究领域。然而，只有有限的尝试，以获得潜在的n型受体材料。本文提出的项目旨在开发可作为n型半导体的缺电子S， n杂环（噻唑，苯并噻唑二唑）的准活聚合。通过制造出电子迁移率超过1 cm2/Vs的基于低聚噻唑的n沟道ofet，证明了这些构建模块的潜力。然而，基于噻唑的均聚物的研究细节要少得多，而且迄今为止还没有通过CTP获得。在本项目的过程中，将详细研究各自构建块的ctp聚合机理。由此获得的材料的电子导电性能应通过掺入n沟道ofet和opv来表征。该项目的最终目标是合成由富电子供体嵌段（如聚（3-烷基噻吩））和缺电子受体嵌段(如聚（4-烷基噻唑）组成的棒-棒嵌段共聚物。类似的嵌段共聚物已经被证明可以自组装成相分离的层状结构，代表了OPV活性层的理想形态。

This project is concerned with the synthesis of new conjugated polymers that shall serve as electron conductors (n-type materials) in organic photovoltaic cells (OPVs) and field effect transistors (OFETs).In recent years, preparative methods have emerged that allow for the quasi-living cross-coupling polymerization (generally termed chain-growth Catalyst Transfer Polycondensation, CTP), and grant access to all-conjugated rod-rod block-copolymers. The synthesis of electron rich hole-conducting (p-type) polymers via CTP is a well-developed, active area of research. However, only limited attempts have been made to access potential n-type acceptor materials.The project proposed herein is aimed at developing the quasi-living polymerization of electron deficient S,N-heterocycles (thiazole, benzothiadiazole) that can serve as n-type semiconductors. The potentialities of these building blocks have been demonstrated via the fabrication of oligo-thiazole based n-channel OFETs that exhibited electron mobilities exceeding 1 cm2/Vs. Thiazole based homopolymers, however, have been investigated in much less detail and, to date, have not been accessed via CTP.In the course of this project, the mechanism of the CTP-polymerization of the respective building blocks will be investigated in detail. The electron conducting properties of the thus obtained materials shall be characterized by incorporation into n-channel OFETs and OPVs.The eventual goal of this project is the synthesis of rod-rod block copolymers composed of an electron rich donor block (e.g. poly(3-alkylthiophene)) and an electron deficient acceptor block (e.g. poly(4-alkylthiazole). Similar block copolymers have been shown to self-assemble into phase separated lamellar structures that represent the ideal morphology of the active layer of an OPV.