Synthesis and Exciton Dynamics of Triplet Sensitized Conjugated Polymers

Handle URI:
http://hdl.handle.net/10754/561063
Title:
Synthesis and Exciton Dynamics of Triplet Sensitized Conjugated Polymers
Authors:
Andernach, Rolf; Utzat, Hendrik; Dimitrov, Stoichko; McCulloch, Iain ( 0000-0002-6340-7217 ) ; Heeney, Martin; Durrant, James; Bronstein, Hugo
Abstract:
We report the synthesis of a novel polythiophene-based host-guest copolymer incorporating a Pt-porphyrin complex (TTP-Pt) into the backbone for efficient singlet to triplet polymer exciton sensitization. We elucidated the exciton dynamics in thin films of the material by means of Transient Absorption Spectrosopcy (TAS) on multiple timescales and investigated the mechanism of triplet exciton formation. During sensitization, single exciton diffusion is followed by exciton transfer from the polymer backbone to the complex where it undergoes intersystem crossing to the triplet state of the complex. We directly monitored the triplet exciton back transfer from the Pt-porphyrin to the polymer and find that 60% of the complex triplet excitons are transferred with a time constant of 1087 ps. We propose an equilibrium between polymer and porphyrin triplet states as a result of the low triplet diffusion length in the polymer backbone and hence an increased local triplet population resulting in increased triplet-triplet annihilation. This novel system has significant implications for the design of novel materials for triplet sensitized solar cells and up-conversion layers.
KAUST Department:
Solar and Photovoltaic Engineering Research Center (SPERC)
Citation:
Synthesis and Exciton Dynamics of Triplet Sensitized Conjugated Polymers 2015:150722135805007 Journal of the American Chemical Society
Publisher:
American Chemical Society (ACS)
Journal:
Journal of the American Chemical Society
Issue Date:
22-Jul-2015
DOI:
10.1021/jacs.5b06223
Type:
Article
ISSN:
0002-7863; 1520-5126
Additional Links:
http://pubs.acs.org/doi/abs/10.1021/jacs.5b06223
Appears in Collections:
Articles; Solar and Photovoltaic Engineering Research Center (SPERC)

Full metadata record

DC FieldValue Language
dc.contributor.authorAndernach, Rolfen
dc.contributor.authorUtzat, Hendriken
dc.contributor.authorDimitrov, Stoichkoen
dc.contributor.authorMcCulloch, Iainen
dc.contributor.authorHeeney, Martinen
dc.contributor.authorDurrant, Jamesen
dc.contributor.authorBronstein, Hugoen
dc.date.accessioned2015-07-27T12:16:35Zen
dc.date.available2015-07-27T12:16:35Zen
dc.date.issued2015-07-22en
dc.identifier.citationSynthesis and Exciton Dynamics of Triplet Sensitized Conjugated Polymers 2015:150722135805007 Journal of the American Chemical Societyen
dc.identifier.issn0002-7863en
dc.identifier.issn1520-5126en
dc.identifier.doi10.1021/jacs.5b06223en
dc.identifier.urihttp://hdl.handle.net/10754/561063en
dc.description.abstractWe report the synthesis of a novel polythiophene-based host-guest copolymer incorporating a Pt-porphyrin complex (TTP-Pt) into the backbone for efficient singlet to triplet polymer exciton sensitization. We elucidated the exciton dynamics in thin films of the material by means of Transient Absorption Spectrosopcy (TAS) on multiple timescales and investigated the mechanism of triplet exciton formation. During sensitization, single exciton diffusion is followed by exciton transfer from the polymer backbone to the complex where it undergoes intersystem crossing to the triplet state of the complex. We directly monitored the triplet exciton back transfer from the Pt-porphyrin to the polymer and find that 60% of the complex triplet excitons are transferred with a time constant of 1087 ps. We propose an equilibrium between polymer and porphyrin triplet states as a result of the low triplet diffusion length in the polymer backbone and hence an increased local triplet population resulting in increased triplet-triplet annihilation. This novel system has significant implications for the design of novel materials for triplet sensitized solar cells and up-conversion layers.en
dc.publisherAmerican Chemical Society (ACS)en
dc.relation.urlhttp://pubs.acs.org/doi/abs/10.1021/jacs.5b06223en
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/jacs.5b06223.en
dc.titleSynthesis and Exciton Dynamics of Triplet Sensitized Conjugated Polymersen
dc.typeArticleen
dc.contributor.departmentSolar and Photovoltaic Engineering Research Center (SPERC)en
dc.identifier.journalJournal of the American Chemical Societyen
dc.eprint.versionPost-printen
dc.contributor.institutionCentre for Plastic Electronics, Imperial College London, UK, SW7 2AZen
dc.contributor.institutionDepartment of Chemistry, MIT, Cambridge MA, 0213 9, USAen
dc.contributor.institutionDepartment of Chemistry, University College Lond on, UK, WC1H 0AJen
kaust.authorMcCulloch, Iainen
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