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Diffusion length and langevin recombination of singlet and triplet excitons in organic heterojunction solar cells

Ompong, David and Singh, Jai (2015). Diffusion length and langevin recombination of singlet and triplet excitons in organic heterojunction solar cells<br />. ChemPhysChem,16(4):1281-1285.

Document type: Journal Article
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IRMA ID 75039815xPUB845
Title Diffusion length and langevin recombination of singlet and triplet excitons in organic heterojunction solar cells
Author Ompong, David
Singh, Jai
Journal Name ChemPhysChem
Publication Date 2015
Volume Number 16
Issue Number 4
ISSN 1439-4235   (check CDU catalogue  open catalogue search in new window)
eISSN 1439-7641
Scopus ID 2-s2.0-84928039254
Start Page 1281
End Page 1285
Total Pages 5
Place of Publication Germany
Publisher Wiley - V C H Verlag GmbH & Co. KGaA
Language English
Field of Research ENGINEERING
HERDC Category C1 - Journal Article (DIISR)
Abstract We derived new expressions for the diffusion length of singlet and triplet excitons by using the Föster and Dexter transfer mechanisms, respectively, and have found that the diffusion lengths of singlet and triplet excitons are comparable. By using the Langevin recombination theory, we derived the rate of recombination of dissociated free charges into their excitonic states. We found that in some organic polymers the probabilities of recombination of free charge carriers back into the singlet and triplet states are approximately 65.6 and 34.4^%, respectively, indicating that Langevin-type recombination into triplet excitons in organic semiconductors is less likely. This implies that the creation of triplet excitons may be advantageous in organic solar cells, because this may lead to dissociated free charge carriers that can be collected at their respective electrodes, which should result in better conversion efficiency.
Keywords Donor-acceptor systems
Electronic structure
Electron transfer
Electron transport
Energy conversion
DOI http://dx.doi.org/10.1002/cphc.201402720   (check subscription with CDU E-Gateway service for CDU Staff and Students  check subscription with CDU E-Gateway in new window)
Additional Notes An invited contribution to a Special Issue on Organic Electronics
 
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Created: Thu, 05 Mar 2015, 22:00:17 CST by David Ompong