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

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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.