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Please use this identifier to cite or link to this item: http://hdl.handle.net/1942/28691

Title: How to determine optical gaps and voltage losses in organic photovoltaic materials
Authors: Vandewal, K.
Benduhn, J.
Nikolis, V. C.
Issue Date: 2018
Citation: SUSTAINABLE ENERGY & FUELS, 2(3), p. 538-544
Abstract: The best performing organic solar cells (OSC) efficiently absorb photons and convert them to free charge carriers, which are subsequently collected at the electrodes. However, the energy lost in this process is much larger than for inorganic and perovskite solar cells, currently limiting the power conversion efficiency of OSCs to values slightly below 14%. To quantify energy losses, the open-circuit voltage of the solar cell is often compared to its optical gap. The latter is, however, not obvious to determine for organic materials which have broad absorption and emission bands, and is often done erroneously. Nevertheless, a deeper understanding of the energy loss mechanisms depends crucially on an accurate determination of the energies of the excited states involved in the photo-conversion process. This perspective therefore aims to summarize how the optical gap can be precisely determined, and how it relates to energy losses in organic photovoltaic materials.
Notes: [Vandewal, K.; Benduhn, J.; Nikolis, V. C.] Tech Univ Dresden, Inst Appl Phys, Dresden Integrated Ctr Appl Phys & Photon Mat IAP, Nothnitzer Str 61, D-01187 Dresden, Germany. [Vandewal, K.] Hasselt Univ, IMO, Wetenschapspk 1, BE-3590 Diepenbeek, Belgium.
URI: http://hdl.handle.net/1942/28691
DOI: 10.1039/c7se00601b
ISI #: 000426712600002
ISSN: 2398-4902
Category: A1
Type: Journal Contribution
Appears in Collections: Research publications

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