Directional crystallization of semiconducting homopolymers and novel donor-acceptor diblock copolymers for control of nanostructure and optoelectronic properties

用于控制纳米结构和光电性能的半导体均聚物和新型供体-受体二嵌段共聚物的定向结晶

• 批准号: 407706940
• 负责人: Professor Dr. Mukundan Thelakkat
• 金额: --
• 依托单位: Fachgruppe Experimentelle Polymerphysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2018
• 资助国家: 德国
• 起止时间: 2017-12-31 至 2022-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/407706940?language=en
• 关键词: Directional; crystallization; semiconducting; homopolymers; novel

Donor-acceptor block copolymers are potentially promising materials for organic solar cells. By self-assembly they are able to form thermodynamically stable donor-acceptor nanostructures. Such nanostructures are a fundamental requirement for efficient photoinduced charge separation into holes and electrons. Compared to the usually used donor/acceptor blends, block copolymers offer increased control over the morphology and avoid morphological degradation.While basic understanding of the complex self-assembly behavior of donor-acceptor block copolymers has been achieved, current investigations are limited to a small number of model materials and the necessary alignment of the microphase structure has not been realized. This proposal addresses both of these issues. New optimized materials will be synthesized, and using these materials, we plan to explore interface induced, directed crystallization as a means to create well-aligned donor-acceptor nanostructures to ensure efficient charge transport. In order to address both of the interwoven aims, the project consists of a collaboration between two groups with suitable expertize.In the polymer chemistry part of the project, both side-chain functionalized and all-conjugated block copolymers with a P3HT donor block and new optimized acceptor blocks based on PCBM with low Tg and Polydiketopyrrolopyrrole respectively will be synthesized. The self-assembly of these materials in bulk will be studied beforehand to make sure that structure formation is driven by crystallization. In the polymer physics part, the prerequisites for obtaining fully oriented crystalline films will be investigated in a first part using model materials supplied by polymer chemistry. In a second step, the elaborated methods of directional crystallization and epitaxial orientation will be transferred to block copolymers to obtain films with oriented donor-acceptor nanostructure. Electrical characterization will be performed in a diode setup (SCLC) measurements giving information about vertical charge transport.

给体-受体嵌段共聚物是一种具有潜在应用前景的有机太阳能电池材料。通过自组装，它们能够形成化学稳定的供体-受体纳米结构。这种纳米结构是有效的光致电荷分离成空穴和电子的基本要求。与通常使用的给体/受体共混物相比，嵌段共聚物提供了对形态的更好控制，避免了形态退化，虽然已经实现了对给体-受体嵌段共聚物复杂自组装行为的基本理解，但目前的研究仅限于少数模型材料，并且尚未实现必要的微相结构对齐。这项建议涉及这两个问题。将合成新的优化材料，并使用这些材料，我们计划探索界面诱导，定向结晶作为一种手段，以创建良好对齐的供体-受体纳米结构，以确保有效的电荷传输。为了解决这两个相互交织的目标，该项目由两个具有适当专业知识的团队合作组成。在该项目的高分子化学部分，将分别合成具有P3 HT供体嵌段的侧链官能化和全共轭嵌段共聚物以及基于低Tg PCBM和聚二酮吡咯并吡咯的新型优化受体嵌段。这些材料的自组装将事先研究，以确保结构的形成是由结晶驱动的。在高分子物理部分，获得完全取向的结晶膜的先决条件将在第一部分使用高分子化学提供的模型材料进行研究。在第二步中，将定向结晶和外延取向的精细方法转移到嵌段共聚物中以获得具有取向的供体-受体纳米结构的膜。将在二极管设置（SCLC）测量中进行电气表征，提供有关垂直电荷传输的信息。