Proceedings of 6th International Conference on Hybrid and Organic Photovoltaics (HOPV14)
Publication date: 1st March 2014
Covalent organic frameworks (COFs) have recently attracted considerable attention as novel materials for organic optoelectronics. These crystalline, porous materials can feature π-stacked sheets of covalently linked organic building blocks, which enable fast charge transport.
Selection of suitable molecular building blocks and rational design of the framework enables us to create semiconducting COFs that combine broad light absorption and high extinction coefficients with good charge transport capabilities.
We recently reported the synthesis of thienothiophene-based COF thin films and the formation of an ordered bulk heterojunction via infiltration with fullerene derivatives.[1] Spectroscopic analysis revealed light-induced charge transfer from the COF donor network to the pore-located acceptor phase. We were also able to incorporate this material into first photovoltaic devices.
Furthermore, efficient photo-generation of charge carriers within ordered donor-acceptor networks could be demonstrated. In this device concept, the bulk heterojunction is formed by aligned columns of the donor and acceptor molecules that constitute the COF.
Here we will present new results on COF-based photovoltaic devices, spectroscopic investigations of the light-induced charge transfer, and strategies to extend the light harvesting capabilities and current collection.
Schematic illustration of the light-induced electron transfer from the COF network to pore-located acceptor molecules.
[1] Dogru, M.; Handloser, M.; Auras, F.; Kunz, T.; Medina, D.; Hartschuh, A.; Knochel, P.; Bein, T. A Photoconductive Thienothiophene-Based Covalent Organic Framework Showing Charge Transfer Towards Included Fullerene. Angew. Chem. Int. Ed. 2013, 52, 2920-2924.
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