Stereoisomeric Non-Fullerene Acceptors-Based Organic Solar Cells.
chiral non-fullerene acceptors
entropy effect
organic solar cells
photovoltaic performance
racemic mixtures
Journal
Small (Weinheim an der Bergstrasse, Germany)
ISSN: 1613-6829
Titre abrégé: Small
Pays: Germany
ID NLM: 101235338
Informations de publication
Date de publication:
12 Sep 2023
12 Sep 2023
Historique:
revised:
20
08
2023
received:
05
07
2023
medline:
13
9
2023
pubmed:
13
9
2023
entrez:
12
9
2023
Statut:
aheadofprint
Résumé
Chiral alkyl chains are ubiquitously observed in organic semiconductor materials and can regulate solution processability and active layer morphology, but the effect of stereoisomers on photovoltaic performance has rarely been investigated. For the racemic Y-type acceptors widely used in organic solar cells, it remains unknown if the individual chiral molecules separate into the conglomerate phase or if racemic phase prevails. Here, the photovoltaic performance of enantiomerically pure Y6 derivatives, (S,S)/(R,R)-BTP-4F, and their chiral mixtures are compared. It is found that (S,S) and (R,R)-BTP-4F molecule in the racemic mixtures tends to interact with its enantiomer. The racemic mixtures enable efficient light harvesting, fast hole transfer, and long polaron lifetime, which is conducive to charge generation and suppresses the recombination losses. Moreover, abundant charge diffusion pathways provided by the racemate contribute to efficient charge transport. As a result, the racemate system maximizes the power output and minimizes losses, leading to a higher efficiency of 18.16% and a reduced energy loss of 0.549 eV, as compared to the enantiomerically pure molecules. This study demonstrates that the chirality of non-fullerene acceptors should receive more attention and be designed rationally to enhance the efficiency of organic solar cells.
Identifiants
pubmed: 37699757
doi: 10.1002/smll.202305638
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
e2305638Subventions
Organisme : Strategic Priority Research Program of Chinese Academy of Sciences
ID : XDB36000000
Organisme : National Natural Science Foundation of China
ID : 22135001
Organisme : National Natural Science Foundation of China
ID : 21975059
Organisme : National Natural Science Foundation of China
ID : 21721002
Organisme : National Natural Science Foundation of China
ID : 22173004
Informations de copyright
© 2023 Wiley-VCH GmbH.
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