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000890081 1001_ $$0P:(DE-Juel1)180634$$aClassen, Andrej$$b0
000890081 245__ $$aThe role of exciton lifetime for charge generation in organic solar cells at negligible energy-level offsets
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000890081 520__ $$aOrganic solar cells utilize an energy-level offset to generate free charge carriers. Although a very small energy-level offset increases the open-circuit voltage, it remains unclear how exactly charge generation is affected. Here we investigate organic solar cell blends with highest occupied molecular orbital energy-level offsets (∆EHOMO) between the donor and acceptor that range from 0 to 300 meV. We demonstrate that exciton quenching at a negligible ∆EHOMO takes place on timescales that approach the exciton lifetime of the pristine materials, which drastically limits the external quantum efficiency. We quantitatively describe this finding via the Boltzmann stationary-state equilibrium between charge-transfer states and excitons and further reveal a long exciton lifetime to be decisive in maintaining an efficient charge generation at a negligible ∆EHOMO. Moreover, the Boltzmann equilibrium quantitatively describes the major reduction in non-radiative voltage losses at a very small ∆EHOMO. Ultimately, highly luminescent near-infrared emitters with very long exciton lifetimes are suggested to enable highly efficient organic solar cells.
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000890081 7001_ $$0P:(DE-HGF)0$$aChochos, Christos L.$$b1
000890081 7001_ $$00000-0001-9952-4207$$aLüer, Larry$$b2
000890081 7001_ $$0P:(DE-HGF)0$$aGregoriou, Vasilis G.$$b3
000890081 7001_ $$00000-0002-3584-7442$$aWortmann, Jonas$$b4
000890081 7001_ $$0P:(DE-HGF)0$$aOsvet, Andres$$b5
000890081 7001_ $$0P:(DE-Juel1)178784$$aForberich, Karen$$b6
000890081 7001_ $$00000-0002-6340-7217$$aMcCulloch, Iain$$b7
000890081 7001_ $$0P:(DE-Juel1)180635$$aHeumüller, Thomas$$b8
000890081 7001_ $$0P:(DE-Juel1)176427$$aBrabec, Christoph J.$$b9$$eCorresponding author
000890081 773__ $$0PERI:(DE-600)2847369-3$$a10.1038/s41560-020-00684-7$$gVol. 5, no. 9, p. 711 - 719$$n9$$p711 - 719$$tNature energy$$v5$$x2058-7546$$y2020
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000890081 8564_ $$uhttps://juser.fz-juelich.de/record/890081/files/WF3_derivatives_SI_revised_C_final.pdf$$yPublished on 2020-08-31. Available in OpenAccess from 2021-02-28.
000890081 8564_ $$uhttps://juser.fz-juelich.de/record/890081/files/WF3_derivatives_revised_C_final.pdf$$yPublished on 2020-08-31. Available in OpenAccess from 2021-02-28.
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