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Article: Quantitative bimolecular recombination in organic photovoltaics through triplet exciton formation

TitleQuantitative bimolecular recombination in organic photovoltaics through triplet exciton formation
Authors
Issue Date2014
Citation
Journal of the American Chemical Society, 2014, v. 136, n. 9, p. 3424-3429 How to Cite?
AbstractThe nanoscale morphology and high charge densities in organic photovoltaics (OPVs) lead to a high rate of bimolecular encounters between spin-uncorrelated electrons and holes. This process can lead to the formation of low-energy triplet excitons on the donor polymer that decay nonradiatively and limit the device performance. We use time-resolved optical spectroscopy to characterize the effect of morphology through the use of solvent additives such as 1,8-octanedithiol (ODT) on triplet dynamics and charge recombination in blends of poly[2,6-(4,4-bis(2-ethylhexyl)-4H-cyclopenta[2,1-b;3,4-b′]- dithiophene)-alt-4,7-(2,1,3-benzothiadiazole)] and [6,6]-phenyl-C 71-butyric acid methyl ester. This is an attractive OPV system since the extended absorption of the polymer into the near-infrared gives good coverage of the solar spectrum, but nevertheless, the internal quantum efficiency (IQE) has not been reported to be higher than ∼65% under short circuit conditions. We find that, without ODT, the IQE is 48% and 16% of excitations decay via bimolecular triplet formation. With ODT treatment, which improves crystallinity and carrier mobility, the IQE increases to 65%, but bimolecular triplet formation significantly increases and now accounts for all of the recombination (35% of charges). © 2014 American Chemical Society.
Persistent Identifierhttp://hdl.handle.net/10722/285721
ISSN
2023 Impact Factor: 14.4
2023 SCImago Journal Rankings: 5.489
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorChow, Philip C.Y.-
dc.contributor.authorGélinas, Simon-
dc.contributor.authorRao, Akshay-
dc.contributor.authorFriend, Richard H.-
dc.date.accessioned2020-08-18T04:56:28Z-
dc.date.available2020-08-18T04:56:28Z-
dc.date.issued2014-
dc.identifier.citationJournal of the American Chemical Society, 2014, v. 136, n. 9, p. 3424-3429-
dc.identifier.issn0002-7863-
dc.identifier.urihttp://hdl.handle.net/10722/285721-
dc.description.abstractThe nanoscale morphology and high charge densities in organic photovoltaics (OPVs) lead to a high rate of bimolecular encounters between spin-uncorrelated electrons and holes. This process can lead to the formation of low-energy triplet excitons on the donor polymer that decay nonradiatively and limit the device performance. We use time-resolved optical spectroscopy to characterize the effect of morphology through the use of solvent additives such as 1,8-octanedithiol (ODT) on triplet dynamics and charge recombination in blends of poly[2,6-(4,4-bis(2-ethylhexyl)-4H-cyclopenta[2,1-b;3,4-b′]- dithiophene)-alt-4,7-(2,1,3-benzothiadiazole)] and [6,6]-phenyl-C 71-butyric acid methyl ester. This is an attractive OPV system since the extended absorption of the polymer into the near-infrared gives good coverage of the solar spectrum, but nevertheless, the internal quantum efficiency (IQE) has not been reported to be higher than ∼65% under short circuit conditions. We find that, without ODT, the IQE is 48% and 16% of excitations decay via bimolecular triplet formation. With ODT treatment, which improves crystallinity and carrier mobility, the IQE increases to 65%, but bimolecular triplet formation significantly increases and now accounts for all of the recombination (35% of charges). © 2014 American Chemical Society.-
dc.languageeng-
dc.relation.ispartofJournal of the American Chemical Society-
dc.titleQuantitative bimolecular recombination in organic photovoltaics through triplet exciton formation-
dc.typeArticle-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1021/ja410092n-
dc.identifier.pmid24521399-
dc.identifier.scopuseid_2-s2.0-84897730961-
dc.identifier.volume136-
dc.identifier.issue9-
dc.identifier.spage3424-
dc.identifier.epage3429-
dc.identifier.eissn1520-5126-
dc.identifier.isiWOS:000332684700022-
dc.identifier.issnl0002-7863-

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