Efficient solar cells are more stable: The impact of polymer molecular weight on performance of organic photovoltaics

Hdl Handle:
http://hdl.handle.net/10034/618759
Title:
Efficient solar cells are more stable: The impact of polymer molecular weight on performance of organic photovoltaics
Authors:
Ding, Ziqian; Kettle, Jeff; Horie, Masaki; Chang, Shu-Wi; Smith, Graham C.; Shames, Alexander I.; Katz, Eugene A.
Abstract:
The principle remaining challenge in the research area of organic photovoltaic (OPV) materials is to develop solar cells that combine high efficiency, stability and reproducibility. Here, we demonstrate an experimental strategy which has successfully addressed this challenge. We produced a number of samples of the highly efficient PTB7 polymer with various molecular weights (Mn 40–220k). OPV cells fabricated with this polymer demonstrated significant improvement of the cell efficiency (by 90% relative) and lifetime (by 300% relative) with the Mn increase. We attribute these effects to the lower density of recombination centers (persistent radical defects revealed by EPR spectroscopy) and better photoactive layer morphology in the samples with higher Mn. Relevance of the observed correlation between the OPV efficiency and stability is discussed.
Affiliation:
University of Bangor (Ding, Kettle), National Tsing Hua Univeristy Taiwan (Horie, Chang), University of Chester (Smith), Ben Gurion University of the Negev (Shames, Katz)
Citation:
Ding, Z., Kettle, J., Horie, M., Chang, S. W., Smith, G. C., Shames, A. I., & Katz, E. A. (2016). Efficient solar cells are more stable: the impact of polymer molecular weight on performance of organic photovoltaics. Journal of Materials Chemistry A, 4(19), 7274-7280. doi: 10.1039/C6TA00721J
Publisher:
Royal Society of Chemistry
Journal:
Journal of Materials Chemistry A
Publication Date:
14-Apr-2016
URI:
http://hdl.handle.net/10034/618759
DOI:
10.1039/C6TA00721J
Additional Links:
http://pubs.rsc.org/en/journals/journalissues/ta#!recentarticles&adv
Type:
Article
Language:
en
EISSN:
2050-7496
Appears in Collections:
Natural Sciences

Full metadata record

DC FieldValue Language
dc.contributor.authorDing, Ziqianen
dc.contributor.authorKettle, Jeffen
dc.contributor.authorHorie, Masakien
dc.contributor.authorChang, Shu-Wien
dc.contributor.authorSmith, Graham C.en
dc.contributor.authorShames, Alexander I.en
dc.contributor.authorKatz, Eugene A.en
dc.date.accessioned2016-08-24T14:13:04Z-
dc.date.available2016-08-24T14:13:04Z-
dc.date.issued2016-04-14-
dc.identifier.citationDing, Z., Kettle, J., Horie, M., Chang, S. W., Smith, G. C., Shames, A. I., & Katz, E. A. (2016). Efficient solar cells are more stable: the impact of polymer molecular weight on performance of organic photovoltaics. Journal of Materials Chemistry A, 4(19), 7274-7280. doi: 10.1039/C6TA00721Jen
dc.identifier.doi10.1039/C6TA00721J-
dc.identifier.urihttp://hdl.handle.net/10034/618759-
dc.description.abstractThe principle remaining challenge in the research area of organic photovoltaic (OPV) materials is to develop solar cells that combine high efficiency, stability and reproducibility. Here, we demonstrate an experimental strategy which has successfully addressed this challenge. We produced a number of samples of the highly efficient PTB7 polymer with various molecular weights (Mn 40–220k). OPV cells fabricated with this polymer demonstrated significant improvement of the cell efficiency (by 90% relative) and lifetime (by 300% relative) with the Mn increase. We attribute these effects to the lower density of recombination centers (persistent radical defects revealed by EPR spectroscopy) and better photoactive layer morphology in the samples with higher Mn. Relevance of the observed correlation between the OPV efficiency and stability is discussed.en
dc.language.isoenen
dc.publisherRoyal Society of Chemistryen
dc.relation.urlhttp://pubs.rsc.org/en/journals/journalissues/ta#!recentarticles&adven
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/en
dc.subjectSolar cellen
dc.subjectOPVen
dc.subjectPolymeren
dc.subjectMolecular weighten
dc.titleEfficient solar cells are more stable: The impact of polymer molecular weight on performance of organic photovoltaicsen
dc.typeArticleen
dc.identifier.eissn2050-7496-
dc.contributor.departmentUniversity of Bangor (Ding, Kettle), National Tsing Hua Univeristy Taiwan (Horie, Chang), University of Chester (Smith), Ben Gurion University of the Negev (Shames, Katz)en
dc.identifier.journalJournal of Materials Chemistry Aen
dc.date.accepted2016-04-13-
or.grant.openaccessYesen
rioxxterms.funderunfundeden
rioxxterms.identifier.projectunfundeden
rioxxterms.versionAMen
rioxxterms.licenseref.startdate2017-04-14-
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