Transient EDMR: A novel tool to study charge transport in organic solar cells

该项目旨在全面了解有机和混合太阳能电池中的电荷转移和随后的电荷转移。利用在本优先计划第一阶段成功开发的瞬变电检测磁共振(TrEDMR)技术，我们将研究最终导致高效有机太阳能电池中电荷分离的激发转移路径。将特别强调三重态激子的作用，这些激子可能涉及到限制基于低带隙共聚物的太阳能电池效率的损耗机制。这些结果将与由有机和无机半导体组成的混合太阳能电池的电荷分离性能进行比较。我们将进一步利用有机场效应晶体管提供的独特机会来区分不同的基本EDMR活性过程，这些过程有助于高效有机半导体器件中的电荷传输。

This project aims at developing a comprehensive understanding of charge transfer and subsequent charge transport in organic and hybrid solar cells. Using the technique of transient electrically detected magnetic resonance (trEDMR), which was successfully developed during the first period of this Priority Programme, we will investigate excitation transfer pathways that finally lead to separated charges in high-efficiency organic solar cells. Particular emphasis will be given to the role of triplet excitons that are potentially involved in loss-mechanisms limiting the efficiency of solar cells based on low-bandgap copolymers. The results will be compared to those obtained on charge separation properties of hybrid solar cells consisting of organic and inorganic semiconductors. We will further use the unique opportunities offered by organic field effect transistors to distinguish between different fundamental EDMR-active processes that contribute to the charge transport in efficient organic semiconductor devices.