Interplay Between Side Chain Pattern, Polymer Aggregation, and Charge Carrier Dynamics in PBDTTPD:PCBM Bulk-Heterojunction Solar Cells

Handle URI:
http://hdl.handle.net/10754/553014
Title:
Interplay Between Side Chain Pattern, Polymer Aggregation, and Charge Carrier Dynamics in PBDTTPD:PCBM Bulk-Heterojunction Solar Cells
Authors:
Dyer-Smith, Clare; Howard, Ian A.; Cabanetos, Clement; El Labban, Abdulrahman ( 0000-0001-9891-0851 ) ; Beaujuge, Pierre; Laquai, Frédéric ( 0000-0002-5887-6158 )
Abstract:
Poly(benzo[1,2-b:4,5-b′]dithiophene–alt–thieno[3,4-c]pyrrole-4,6-dione) (PBDTTPD) polymer donors with linear side-chains yield bulk-heterojunction (BHJ) solar cell power conversion efficiencies (PCEs) of about 4% with phenyl-C71-butyric acid methyl ester (PC71BM) as the acceptor, while a PBDTTPD polymer with a combination of branched and linear substituents yields a doubling of the PCE to 8%. Using transient optical spectroscopy it is shown that while the exciton dissociation and ultrafast charge generation steps are not strongly affected by the side chain modifications, the polymer with branched side chains exhibits a decreased rate of nongeminate recombination and a lower fraction of sub-nanosecond geminate recombination. In turn the yield of long-lived charge carriers increases, resulting in a 33% increase in short circuit current (J sc). In parallel, the two polymers show distinct grazing incidence X-ray scattering spectra indicative of the presence of stacks with different orientation patterns in optimized thin-film BHJ devices. Independent of the packing pattern the spectroscopic data also reveals the existence of polymer aggregates in the pristine polymer films as well as in both blends which trap excitons and hinder their dissociation.
KAUST Department:
Materials Science and Engineering Program; Physical Sciences and Engineering (PSE) Division; Chemical Science Program
Citation:
Dyer-Smith C., Howard I. A., Cabanetos C., El Labban A., Beaujuge P. M., Laquai F. (2015). Interplay Between Side Chain Pattern, Polymer Aggregation, and Charge Carrier Dynamics in PBDTTPD:PCBM Bulk-Heterojunction Solar Cells. Adv. Energy Mater., 5: . doi: 10.1002/aenm.201401778
Publisher:
Wiley-Blackwell
Journal:
Advanced Energy Materials
Issue Date:
May-2015
DOI:
10.1002/aenm.201401778
Type:
Article
ISSN:
16146832
Additional Links:
http://doi.wiley.com/10.1002/aenm.201401778
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Chemical Science Program; Materials Science and Engineering Program

Full metadata record

DC FieldValue Language
dc.contributor.authorDyer-Smith, Clareen
dc.contributor.authorHoward, Ian A.en
dc.contributor.authorCabanetos, Clementen
dc.contributor.authorEl Labban, Abdulrahmanen
dc.contributor.authorBeaujuge, Pierreen
dc.contributor.authorLaquai, Frédéricen
dc.date.accessioned2015-05-17T20:34:34Zen
dc.date.available2015-05-17T20:34:34Zen
dc.date.issued2015-05en
dc.identifier.citationDyer-Smith C., Howard I. A., Cabanetos C., El Labban A., Beaujuge P. M., Laquai F. (2015). Interplay Between Side Chain Pattern, Polymer Aggregation, and Charge Carrier Dynamics in PBDTTPD:PCBM Bulk-Heterojunction Solar Cells. Adv. Energy Mater., 5: . doi: 10.1002/aenm.201401778en
dc.identifier.issn16146832en
dc.identifier.doi10.1002/aenm.201401778en
dc.identifier.urihttp://hdl.handle.net/10754/553014en
dc.description.abstractPoly(benzo[1,2-b:4,5-b′]dithiophene–alt–thieno[3,4-c]pyrrole-4,6-dione) (PBDTTPD) polymer donors with linear side-chains yield bulk-heterojunction (BHJ) solar cell power conversion efficiencies (PCEs) of about 4% with phenyl-C71-butyric acid methyl ester (PC71BM) as the acceptor, while a PBDTTPD polymer with a combination of branched and linear substituents yields a doubling of the PCE to 8%. Using transient optical spectroscopy it is shown that while the exciton dissociation and ultrafast charge generation steps are not strongly affected by the side chain modifications, the polymer with branched side chains exhibits a decreased rate of nongeminate recombination and a lower fraction of sub-nanosecond geminate recombination. In turn the yield of long-lived charge carriers increases, resulting in a 33% increase in short circuit current (J sc). In parallel, the two polymers show distinct grazing incidence X-ray scattering spectra indicative of the presence of stacks with different orientation patterns in optimized thin-film BHJ devices. Independent of the packing pattern the spectroscopic data also reveals the existence of polymer aggregates in the pristine polymer films as well as in both blends which trap excitons and hinder their dissociation.en
dc.publisherWiley-Blackwellen
dc.relation.urlhttp://doi.wiley.com/10.1002/aenm.201401778en
dc.rightsThis is the peer reviewed version of the following article: Dyer-Smith C., Howard I. A., Cabanetos C., El Labban A., Beaujuge P. M., Laquai F. (2015). Interplay Between Side Chain Pattern, Polymer Aggregation, and Charge Carrier Dynamics in PBDTTPD:PCBM Bulk-Heterojunction Solar Cells. Adv. Energy Mater., 5: . doi: 10.1002/aenm.201401778, which has been published in final form at http://doi.wiley.com/10.1002/aenm.201401778. This article may be used for non-commercial purposes in accordance With Wiley Terms and Conditions for self-archiving.en
dc.subjectbulk-heterojunction solar cellsen
dc.subjectcharge carrier dynamicsen
dc.subjectpolymer solar cellsen
dc.subjectstructure–property relationshipsen
dc.subjecttransient absorption spectroscopyen
dc.titleInterplay Between Side Chain Pattern, Polymer Aggregation, and Charge Carrier Dynamics in PBDTTPD:PCBM Bulk-Heterojunction Solar Cellsen
dc.typeArticleen
dc.contributor.departmentMaterials Science and Engineering Programen
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.contributor.departmentChemical Science Programen
dc.identifier.journalAdvanced Energy Materialsen
dc.eprint.versionPost-printen
dc.contributor.institutionMax Planck Research Group for Organic Optoelectronics; Max Planck Institute for Polymer Research; Ackermannweg 10 D-55128 Mainz Germanyen
dc.contributor.institutionMax Planck Research Group for Organic Optoelectronics; Max Planck Institute for Polymer Research; Ackermannweg 10 D-55128 Mainz Germanyen
dc.contributor.institutionMax Planck Research Group for Organic Optoelectronics; Max Planck Institute for Polymer Research; Ackermannweg 10 D-55128 Mainz Germanyen
kaust.authorCabanetos, Clementen
kaust.authorEl Labban, Abdulrahmanen
kaust.authorBeaujuge, Pierreen
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