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| 001 | 890081 | ||
| 005 | 20240712113015.0 | ||
| 024 | 7 | _ | |a 10.1038/s41560-020-00684-7 |2 doi |
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| 100 | 1 | _ | |a Classen, Andrej |0 P:(DE-Juel1)180634 |b 0 |
| 245 | _ | _ | |a The role of exciton lifetime for charge generation in organic solar cells at negligible energy-level offsets |
| 260 | _ | _ | |a London |c 2020 |b Nature Publishing Group |
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| 520 | _ | _ | |a 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. |
| 536 | _ | _ | |a 121 - Solar cells of the next generation (POF3-121) |0 G:(DE-HGF)POF3-121 |c POF3-121 |f POF III |x 0 |
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| 700 | 1 | _ | |a Chochos, Christos L. |0 P:(DE-HGF)0 |b 1 |
| 700 | 1 | _ | |a Lüer, Larry |0 0000-0001-9952-4207 |b 2 |
| 700 | 1 | _ | |a Gregoriou, Vasilis G. |0 P:(DE-HGF)0 |b 3 |
| 700 | 1 | _ | |a Wortmann, Jonas |0 0000-0002-3584-7442 |b 4 |
| 700 | 1 | _ | |a Osvet, Andres |0 P:(DE-HGF)0 |b 5 |
| 700 | 1 | _ | |a Forberich, Karen |0 P:(DE-Juel1)178784 |b 6 |
| 700 | 1 | _ | |a McCulloch, Iain |0 0000-0002-6340-7217 |b 7 |
| 700 | 1 | _ | |a Heumüller, Thomas |0 P:(DE-Juel1)180635 |b 8 |
| 700 | 1 | _ | |a Brabec, Christoph J. |0 P:(DE-Juel1)176427 |b 9 |e Corresponding author |
| 773 | _ | _ | |a 10.1038/s41560-020-00684-7 |g Vol. 5, no. 9, p. 711 - 719 |0 PERI:(DE-600)2847369-3 |n 9 |p 711 - 719 |t Nature energy |v 5 |y 2020 |x 2058-7546 |
| 856 | 4 | _ | |u https://juser.fz-juelich.de/record/890081/files/s41560-020-00684-7.pdf |y Restricted |
| 856 | 4 | _ | |y Published on 2020-08-31. Available in OpenAccess from 2021-02-28. |u https://juser.fz-juelich.de/record/890081/files/WF3_derivatives_SI_revised_C_final.pdf |
| 856 | 4 | _ | |y Published on 2020-08-31. Available in OpenAccess from 2021-02-28. |u https://juser.fz-juelich.de/record/890081/files/WF3_derivatives_revised_C_final.pdf |
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