Projects per year
Abstract
A perylene-based acceptor (PMI-FF-PMI), consisting of two perylene monoimide (PMI) units bridged with a dihydroindeno[1,2-b]fluorene molecule was developed as a potential non-fullerene acceptor (NFA) for organic solar cells (OSCs). The synthesized NFA was combined with the high-performance donor polymer D18 to fabricate efficient OSCs. With an effective bandgap of 2.02 eV, the D18:PMI-FF-PMI blend can be categorized as a wide-bandgap OSC and is an attractive candidate for application as a wide-bandgap sub-cell in all-organic triple-junction solar cell devices. Owing to their large effective bandgap, D18:PMI-FF-PMI solar cells are characterized by an extremely high open-circuit voltage (VOC) of 1.41 V, which to the best of our knowledge is the highest reported value for solution-processed OSCs so far. Despite the exceptionally high VOC of this blend, a comparatively large non-radiative voltage loss (ΔVnon-radOC) of 0.25 V was derived from a detailed voltage loss analysis. Measurements of the electroluminescence quantum yield (ELQY) of the solar cell reveal high ELQY values of ∼0.1%, which contradicts the ELQY values derived from the non-radiative voltage loss (ΔVnon-radOC = 0.25 V, ELQY = 0.0063%). This work should help to raise awareness that (especially for BHJ blends with small ΔHOMO or ΔLUMO offsets) the measured ELQY cannot be straightforwardly used to calculate the ΔVnon-radOC. To avoid any misinterpretation of the non-radiative voltage losses, the presented ELQY discrepancies for the D18:PMI-FF-PMI system should encourage OPV researchers to primarily rely on the ΔVnon-radOC values derived from the presented voltage loss analysis based on EQEPV and J–V measurements.
Original language | English |
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Pages (from-to) | 2888-2906 |
Number of pages | 19 |
Journal | Journal of Materials Chemistry A |
Volume | 10 |
Issue number | 6 |
Early online date | 15 Dec 2021 |
DOIs | |
Publication status | Published - 14 Feb 2022 |
Fields of Expertise
- Advanced Materials Science
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Dive into the research topics of 'Wide-bandgap organic solar cells with a novel perylene-based non-fullerene acceptor enabling open-circuit voltages beyond 1.4 V'. Together they form a unique fingerprint.Projects
- 2 Finished
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FWF - TerryPV - New Terrylene-based Acceptors for Organic Solar Cells
Reinfelds, M.
1/10/19 → 30/09/21
Project: Research project
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ALTAFOS - Alternative Akzeptoren für effiziente organische Solarzellen
1/08/18 → 31/07/21
Project: Research project