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@article{faucris.242411688,
abstract = {Organic solar cells utilize an energy-level offset to generate free charge carriers. Although a very small energy-level offset increases the open-circuit voltage, it remains unclear how exactly charge generation is affected. Here we investigate organic solar cell blends with highest occupied molecular orbital energy-level offsets (∆EHOMO) between the donor and acceptor that range from 0 to 300 meV. We demonstrate that exciton quenching at a negligible ∆EHOMO takes place on timescales that approach the exciton lifetime of the pristine materials, which drastically limits the external quantum efficiency. We quantitatively describe this finding via the Boltzmann stationary-state equilibrium between charge-transfer states and excitons and further reveal a long exciton lifetime to be decisive in maintaining an efficient charge generation at a negligible ∆EHOMO. Moreover, the Boltzmann equilibrium quantitatively describes the major reduction in non-radiative voltage losses at a very small ∆EHOMO. Ultimately, highly luminescent near-infrared emitters with very long exciton lifetimes are suggested to enable highly efficient organic solar cells.},
author = {Classen, Andrej and Chochos, Christos L. and Lüer, Larry and Gregoriou, Vasilis G. and Wortmann, Jonas and Osvet, Andres and Forberich, Karen and McCulloch, Iain and Heumüller, Thomas and Brabec, Christoph},
doi = {10.1038/s41560-020-00684-7},
faupublication = {yes},
journal = {Nature Energy},
note = {CRIS-Team Scopus Importer:2020-09-11},
peerreviewed = {Yes},
title = {{The} role of exciton lifetime for charge generation in organic solar cells at negligible energy-level offsets},
year = {2020}
}