Photo-generated carriers lose energy during extraction from polymer-fullerene solar cells

Handle URI:
http://hdl.handle.net/10754/582466
Title:
Photo-generated carriers lose energy during extraction from polymer-fullerene solar cells
Authors:
Melianas, Armantas; Etzold, Fabian; Savenije, Tom J.; Laquai, Frederic ( 0000-0002-5887-6158 ) ; Inganäs, Olle; Kemerink, Martijn ( 0000-0002-7104-7127 )
Abstract:
In photovoltaic devices, the photo-generated charge carriers are typically assumed to be in thermal equilibrium with the lattice. In conventional materials, this assumption is experimentally justified as carrier thermalization completes before any significant carrier transport has occurred. Here, we demonstrate by unifying time-resolved optical and electrical experiments and Monte Carlo simulations over an exceptionally wide dynamic range that in the case of organic photovoltaic devices, this assumption is invalid. As the photo-generated carriers are transported to the electrodes, a substantial amount of their energy is lost by continuous thermalization in the disorder broadened density of states. Since thermalization occurs downward in energy, carrier motion is boosted by this process, leading to a time-dependent carrier mobility as confirmed by direct experiments. We identify the time and distance scales relevant for carrier extraction and show that the photo-generated carriers are extracted from the operating device before reaching thermal equilibrium.
KAUST Department:
Physical Sciences and Engineering (PSE) Division; Materials Science and Engineering Program; Solar and Photovoltaic Engineering Research Center (SPERC)
Citation:
Photo-generated carriers lose energy during extraction from polymer-fullerene solar cells 2015, 6:8778 Nature Communications
Publisher:
Nature Publishing Group
Journal:
Nature Communications
Issue Date:
5-Nov-2015
DOI:
10.1038/ncomms9778
Type:
Article
ISSN:
2041-1723
Additional Links:
http://www.nature.com/doifinder/10.1038/ncomms9778
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Materials Science and Engineering Program; Solar and Photovoltaic Engineering Research Center (SPERC)

Full metadata record

DC FieldValue Language
dc.contributor.authorMelianas, Armantasen
dc.contributor.authorEtzold, Fabianen
dc.contributor.authorSavenije, Tom J.en
dc.contributor.authorLaquai, Fredericen
dc.contributor.authorInganäs, Olleen
dc.contributor.authorKemerink, Martijnen
dc.date.accessioned2015-11-22T11:54:03Zen
dc.date.available2015-11-22T11:54:03Zen
dc.date.issued2015-11-05en
dc.identifier.citationPhoto-generated carriers lose energy during extraction from polymer-fullerene solar cells 2015, 6:8778 Nature Communicationsen
dc.identifier.issn2041-1723en
dc.identifier.doi10.1038/ncomms9778en
dc.identifier.urihttp://hdl.handle.net/10754/582466en
dc.description.abstractIn photovoltaic devices, the photo-generated charge carriers are typically assumed to be in thermal equilibrium with the lattice. In conventional materials, this assumption is experimentally justified as carrier thermalization completes before any significant carrier transport has occurred. Here, we demonstrate by unifying time-resolved optical and electrical experiments and Monte Carlo simulations over an exceptionally wide dynamic range that in the case of organic photovoltaic devices, this assumption is invalid. As the photo-generated carriers are transported to the electrodes, a substantial amount of their energy is lost by continuous thermalization in the disorder broadened density of states. Since thermalization occurs downward in energy, carrier motion is boosted by this process, leading to a time-dependent carrier mobility as confirmed by direct experiments. We identify the time and distance scales relevant for carrier extraction and show that the photo-generated carriers are extracted from the operating device before reaching thermal equilibrium.en
dc.language.isoenen
dc.publisherNature Publishing Groupen
dc.relation.urlhttp://www.nature.com/doifinder/10.1038/ncomms9778en
dc.rightsThis work is licensed under a Creative Commons Attribution 4.0 International License. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in the credit line; if the material is not included under the Creative Commons license, users will need to obtain permission from the license holder to reproduce the material. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/en
dc.titlePhoto-generated carriers lose energy during extraction from polymer-fullerene solar cellsen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentMaterials Science and Engineering Programen
dc.contributor.departmentSolar and Photovoltaic Engineering Research Center (SPERC)en
dc.identifier.journalNature Communicationsen
dc.eprint.versionPublisher's Version/PDFen
dc.contributor.institutionBiomolecular and Organic Electronics, Department of Physics, Chemistry and Biology, Linköping University, 58183 Linköping, Swedenen
dc.contributor.institutionMax Planck Research Group for Organic Optoelectronics, Max Planck Institute for Polymer Research, Ackermannweg 10, Mainz 55128, Germanyen
dc.contributor.institutionOptoelectronic Materials Section, Department of Chemical Engineering, Delft University of Technology, 2628 BL Delft, The Netherlandsen
dc.contributor.institutionComplex Materials and Devices, Department of Physics, Chemistry and Biology, Linköping University, 58183 Linköping, Swedenen
dc.contributor.institutionDepartment of Applied Physics, Eindhoven University of Technology, PO Box 513, 5600 MB Eindhoven, The Netherlandsen
dc.contributor.affiliationKing Abdullah University of Science and Technology (KAUST)en
kaust.authorLaquai, Fredericen
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