An integrated approach towards highly efficient single and multi-junction bulk-heterojunction solar cells based on functionalized oligothiophenes

拟议的更新项目是基于过去两年三个小组之间在SPP 1355计划支持下进行的非常富有成效的合作。噻吩树枝状聚合物为基础的BHJ太阳能电池的光伏性能的调查，以及P3HT：ZnO固体薄膜的形态分析和建模的结果，到目前为止，作为该项目的继续的基础。在此更新提案中，该跨学科研究项目的目标是开发新型三维共轭寡聚噻吩树枝状聚合物作为溶液处理的本体异质结太阳能电池中的有机半导体，并利用这些三维单分散有机纳米物体作为模型化合物来研究本体异质结太阳能电池中的基本物理过程。特别是，将详细讨论纳米级阶段对器件性能的作用的理解，包括电荷的产生，运输和收集。树枝状大分子与PCBM或树枝状大分子与ZnO共混膜的纳米级相分离将通过扫描探针和透射电子显微镜等显微技术进行研究。数学模型将被开发用于分析、描述和模拟共混膜的形态。此外，太阳能电池器件模型，描述光的吸收，激子的扩散，电荷产生和电荷输运内无序的纳米级本体异质结共混物的供体和受体材料将被开发和用于描述和理解的性能的低聚噻吩树枝状聚合物太阳能电池。

The proposed renewal project is based on a very fruitful cooperation between the three groups in the last 2 years supported by SPP 1355 program. The results of photovoltaic performance investigation of thiophene dendrimer-based BHJ solar cells as well as morphology analysis and modeling on P3HT:ZnO solid films, obtained so far, serve as a basis for the continuation of the project. In this renewal proposal, the objective of this interdisciplinary research project is to develop novel three dimensional conjugated oligothiophene dendrimers as organic semiconductors for applications in solution-processed bulk-heterojunction solar cells, and utilize these three dimensional monodisperse organic nano-objects as model compounds to investigate the elementary physical processes in bulk heterojunction solar cells. In particular, the understanding of the role of nanoscale phase on device performance, including charge generation, transportation and collection will be addressed in detail. Nanoscale phase separation of dendrimer:PCBM or dendrimer:ZnO blended films will be investigated by microscopic technologies, such as scanning probe and transmission electron tomography. Mathematical models will be developed for analyzing, describing, and simulating the morphology of the blended films. Furthermore, solar cell device models that describe absorption of light, diffusion of excitons, charge generation and charge transport within disordered nanoscale bulk heterojunction blends of donor and acceptor materials will be developed and used to describe and understand the performance of oligothiophene dendrimer solar cells.