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A unified description of non-radiative voltage losses in organic solar cells
- Source :
- Nature energy 6(8), 799-806 (2021). doi:10.1038/s41560-021-00843-4
- Publication Year :
- 2021
- Publisher :
- Springer Science and Business Media LLC, 2021.
-
Abstract
- Recent advances in organic solar cells based on non-fullerene acceptors (NFAs) come with reduced non-radiative voltage losses (ΔVnr). Here we show that, in contrast to the energy-gap-law dependence observed in conventional donor:fullerene blends, the ΔVnr values in state-of-the-art donor:NFA organic solar cells show no correlation with the energies of charge-transfer electronic states at donor:acceptor interfaces. By combining temperature-dependent electroluminescence experiments and dynamic vibronic simulations, we provide a unified description of ΔVnr for both fullerene- and NFA-based devices. We highlight the critical role that the thermal population of local exciton states plays in low-ΔVnr systems. An important finding is that the photoluminescence yield of the pristine materials defines the lower limit of ΔVnr. We also demonstrate that the reduction in ΔVnr (for example
- Subjects :
- Materials science
Photoluminescence
Fullerene
Organic solar cell
Exciton
Population
Energy Engineering and Power Technology
02 engineering and technology
Electroluminescence
010402 general chemistry
01 natural sciences
621.3: Elektro-, Kommunikations-, Steuerungs- und Regelungstechnik
Condensed Matter::Materials Science
ddc:330
education
Elektrotechnik
education.field_of_study
Renewable Energy, Sustainability and the Environment
Photovoltaic system
021001 nanoscience & nanotechnology
Acceptor
0104 chemical sciences
Electronic, Optical and Magnetic Materials
Fuel Technology
Chemical physics
0210 nano-technology
Subjects
Details
- ISSN :
- 20587546
- Volume :
- 6
- Database :
- OpenAIRE
- Journal :
- Nature Energy
- Accession number :
- edsair.doi.dedup.....4b8fb8026aa87f2747bf26beefb256b6