Long-lived and disorder-free charge transfer states enable endothermic charge separation in efficient non-fullerene organic solar cells.
Journal
Nature communications
ISSN: 2041-1723
Titre abrégé: Nat Commun
Pays: England
ID NLM: 101528555
Informations de publication
Date de publication:
05 Nov 2020
05 Nov 2020
Historique:
received:
16
07
2020
accepted:
28
09
2020
entrez:
6
11
2020
pubmed:
7
11
2020
medline:
7
11
2020
Statut:
epublish
Résumé
Organic solar cells based on non-fullerene acceptors can show high charge generation yields despite near-zero donor-acceptor energy offsets to drive charge separation and overcome the mutual Coulomb attraction between electron and hole. Here, we use time-resolved optical spectroscopy to show that free charges in these systems are generated by thermally activated dissociation of interfacial charge-transfer states that occurs over hundreds of picoseconds at room temperature, three orders of magnitude slower than comparable fullerene-based systems. Upon free electron-hole encounters at later times, both charge-transfer states and emissive excitons are regenerated, thus setting up an equilibrium between excitons, charge-transfer states and free charges. Our results suggest that the formation of long-lived and disorder-free charge-transfer states in these systems enables them to operate closely to quasi-thermodynamic conditions with no requirement for energy offsets to drive interfacial charge separation and achieve suppressed non-radiative recombination.
Identifiants
pubmed: 33154367
doi: 10.1038/s41467-020-19332-5
pii: 10.1038/s41467-020-19332-5
pmc: PMC7645751
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
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