Charge separation at nanostructured molecular donor-acceptor interfaces

有机供体和受体分子是一类重要的太阳能转换材料。本项目的重点是结合四个小组的专业知识来解决激子太阳能电池中薄膜和界面形态与光电特性之间的关系。在第一个资助期内，我们研究了各种不同的供体/受体对的原型，在项目的第二阶段，我们将把重点放在选定的，特别是有前途的D/ a组合上。这种多边方法的目标是详细了解结构和电子特性、微观输运现象和宏观参数之间的关系，这些参数决定了不同原型的供体-受体对的太阳能电池性能。这一知识将使我们能够控制薄膜的生长，使其在供体相和受体相具有激子和电荷传输的有利条件，并在相关界面上有效地分离和提取电荷。从平面异质结开始，我们现在将继续研究更复杂的结构，包括指间有机/有机界面和体异质结，以实现这一目标。我们的工作是协调一致的努力，通过将互补的能力结合在一起，调查和关联单个材料及其组合的各个方面。

Organic donor and acceptor molecules represent an important class of materials for solar energy conversion. The focus of this project is to combine the expertise of four groups to address the correlation between film and interface morphology and the photoelectrical properties in excitonic solar cells. Having investigated a variety of different prototypical donor/acceptor pairs during the first funding period, in this second phase of the project we will focus our efforts on selected, particularly promising D/A combinations. The goal of this multilateral approach is to develop a detailed understanding of the correlation between structural and electronic properties, microscopic transport phenomena and macroscopic parameters determining solar cell performance for different prototypes of donor-acceptor pairs. This knowledge will enable us to control the growth of films with favourable conditions for exciton and charge transport in both the donor and acceptor phase and efficient charge separation and extraction at the involved interfaces. From planar heterojunctions we will now proceed to more complex structures, including interdigitated organic/organic interfaces and bulk heterojunctions to achieve this goal. Our work is a concerted effort to investigate and correlate various aspects of the individual materials and their combinations by bringing complementary competencies together in a joint project.