Charge Photogeneration and extraction in polymer: fullerene bulk heterojunction organic solar cells

该项目旨在深入了解决定新型聚合物：富勒烯系统光伏效率的过程，而不是经过充分研究的参考系统P3HT:PCBM。重点研究了聚合物c - pcpdbt和si - pcpdbt，以及一些新型高效苯二噻吩基共聚物。研究团队将进行各种各样的实验，包括稳态和瞬态实验，如i.)偏倚瞬态泵浦探针光谱，ii.)场相关时间分辨光致发光实验，iii.)延时收集现场实验，iv.)（延时）飞行时间（TOF）和v.)光- celiv实验。这些实验旨在直接观察电场对早期（fs-ns）电荷产生动力学和（双生）重组动力学的影响，以及在纳米到毫秒的时间尺度上对（非双生）电荷重组和提取动力学的影响。实验结果将与界面激子解离过程的理论研究和电荷扩散的微观模拟进行比较。此外，将实验得到的参数输入到宏观器件模拟中，将预测的jv曲线与实验得到的jv曲线进行比较，以评估计算和建模方法的质量。

This project aims at gaining a profound understanding of the processes that determine the photovoltaic efficiency of novel polymer:fullerene systems beyond the well-studied reference system P3HT:PCBM. In particular the polymers C-PCPDTBT and Si-PCPDTBT, as well as some novel high-efficiency benzoditiophene-based copolymers, will be studied. The research team will perform various kinds of experiments including steady-state and transient experiments such as i.) biasdependent transient pump-probe spectroscopy, ii.) field-dependent time-resolved photoluminescence experiments, iii.) time-delayed collection field experiments, iv.) (time-delayed) time-of-flight (TOF) and v.) photo-CELIV experiments. These experiments are supposed to directly observe the effect of an electric field on the early-time (fs-ns) charge generation dynamics and (geminate) recombination dynamics as well as on the (non-geminate) charge recombination and extraction dynamics on a timescale from nano- to milliseconds. The results of the experiments will be compared to theoretical studies of the interfacial exciton dissociation process and microscopic simulations of charge diffusion. Furthermore, the experimentally obtained parameters will be entered into macroscopic device simulations to compare the predicted JV-curves with the experimentally obtained ones in order to evaluate the quality of the calculations and modelling approaches.