Direct correlation of charge transfer absorption with molecular donor:acceptor interfacial area via photothermal deflection spectroscopy

Handle URI:
http://hdl.handle.net/10754/550071
Title:
Direct correlation of charge transfer absorption with molecular donor:acceptor interfacial area via photothermal deflection spectroscopy
Authors:
Domingo, Ester; Vandewal, Koen; Fei, Zhuping; Watkins, Scott E.; Scholes, Fiona H.; Bannock, James H; de Mello, John; Richter, Lee J.; DeLongchamp, Dean M.; Amassian, Aram ( 0000-0002-5734-1194 ) ; Heeney, Martin; Salleo, Alberto; Stingelin, Natalie
Abstract:
We show that the Charge Transfer (CT) absorption signal in bulk-heterojunction (BHJ) solar cell blends, measured by photothermal deflection spectroscopy (PDS), is directly proportional to the density of molecular donor/acceptor interfaces. Since the optical transitions from ground state to the interfacial CT state are weakly allowed at photon energies below the optical gap of both donor and acceptor, we can exploit the use of this sensitive linear absorption spectroscopy for such quantification. Moreover, we determine the absolute molar extinction coefficient of the CT transition for an archetypical polymer-fullerene interface. The latter is ~100 times lower than the extinction coefficient of the donor chromophore involved, allowing us to experimentally estimate the transition dipole moment (0.3 D) and the electronic coupling between ground state and CT state to be on the order of 30 meV.
KAUST Department:
Physical Sciences and Engineering (PSE) Division; Solar and Photovoltaic Engineering Research Center
Citation:
Direct correlation of charge transfer absorption with molecular donor:acceptor interfacial area via photothermal deflection spectroscopy 2015:150409144253004 Journal of the American Chemical Society
Publisher:
American Chemical Society
Journal:
Journal of the American Chemical Society
Issue Date:
9-Apr-2015
DOI:
10.1021/ja512410f
Type:
Article
ISSN:
0002-7863; 1520-5126
Additional Links:
http://pubs.acs.org/doi/abs/10.1021/ja512410f
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Solar and Photovoltaic Engineering Research Center (SPERC)

Full metadata record

DC FieldValue Language
dc.contributor.authorDomingo, Esteren
dc.contributor.authorVandewal, Koenen
dc.contributor.authorFei, Zhupingen
dc.contributor.authorWatkins, Scott E.en
dc.contributor.authorScholes, Fiona H.en
dc.contributor.authorBannock, James Hen
dc.contributor.authorde Mello, Johnen
dc.contributor.authorRichter, Lee J.en
dc.contributor.authorDeLongchamp, Dean M.en
dc.contributor.authorAmassian, Aramen
dc.contributor.authorHeeney, Martinen
dc.contributor.authorSalleo, Albertoen
dc.contributor.authorStingelin, Natalieen
dc.date.accessioned2015-04-14T12:39:12Zen
dc.date.available2015-04-14T12:39:12Zen
dc.date.issued2015-04-09en
dc.identifier.citationDirect correlation of charge transfer absorption with molecular donor:acceptor interfacial area via photothermal deflection spectroscopy 2015:150409144253004 Journal of the American Chemical Societyen
dc.identifier.issn0002-7863en
dc.identifier.issn1520-5126en
dc.identifier.doi10.1021/ja512410fen
dc.identifier.urihttp://hdl.handle.net/10754/550071en
dc.description.abstractWe show that the Charge Transfer (CT) absorption signal in bulk-heterojunction (BHJ) solar cell blends, measured by photothermal deflection spectroscopy (PDS), is directly proportional to the density of molecular donor/acceptor interfaces. Since the optical transitions from ground state to the interfacial CT state are weakly allowed at photon energies below the optical gap of both donor and acceptor, we can exploit the use of this sensitive linear absorption spectroscopy for such quantification. Moreover, we determine the absolute molar extinction coefficient of the CT transition for an archetypical polymer-fullerene interface. The latter is ~100 times lower than the extinction coefficient of the donor chromophore involved, allowing us to experimentally estimate the transition dipole moment (0.3 D) and the electronic coupling between ground state and CT state to be on the order of 30 meV.en
dc.publisherAmerican Chemical Societyen
dc.relation.urlhttp://pubs.acs.org/doi/abs/10.1021/ja512410fen
dc.rightsThis document is the Accepted Manuscript version of a Published Work that appeared in final form in Journal of the American Chemical Society, copyright © American Chemical Society after peer review and technical editing by the publisher. To access the final edited and published work see http://pubs.acs.org/doi/abs/10.1021/ja512410f.en
dc.titleDirect correlation of charge transfer absorption with molecular donor:acceptor interfacial area via photothermal deflection spectroscopyen
dc.typeArticleen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentSolar and Photovoltaic Engineering Research Centeren
dc.identifier.journalJournal of the American Chemical Societyen
dc.eprint.versionPost-printen
dc.contributor.institutionDepartment of Materials and Centre for Plastic Electronics, Imperial College London, London, UKen
dc.contributor.institutionDepartment of Materials Science and Engineering, Stanford University, California, USAen
dc.contributor.institutionInstitut für Angewandte Photophysik TU Dresden, Dresden, Germanyen
dc.contributor.institutionDepartment of Chemistry and Centre for Plastic Electronics, Imperial College London, London, UKen
dc.contributor.institutionCSIRO Materials Science and Engineering, Clayton, VIC, Australiaen
dc.contributor.institutionNational Institute of Standards and Technology (NIST), Gaithersburg, USAen
kaust.authorAmassian, Aramen
kaust.authorDomingo, Esteren
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