Handle URI:
http://hdl.handle.net/10754/597920
Title:
Decohesion Kinetics in Polymer Organic Solar Cells
Authors:
Bruner, Christopher; Novoa, Fernando; Dupont, Stephanie; Dauskardt, Reinhold
Abstract:
© 2014 American Chemical Society. We investigate the role of molecular weight (MW) of the photoactive polymer poly(3-hexylthiophene) (P3HT) on the temperature-dependent decohesion kinetics of bulk heterojunction (BHJ) organic solar cells (OSCs). The MW of P3HT has been directly correlated to its carrier field effect mobilities and the ambient temperature also affects OSC in-service performance and P3HT arrangement within the BHJ layer. Under inert conditions, time-dependent decohesion readily occurs within the BHJ layer at loads well below its fracture resistance. We observe that by increasing the MW of P3HT, greater resistance to decohesion is achieved. However, failure consistently occurs within the BHJ layer representing the weakest layer within the device stack. Additionally, it was found that at temperatures below the glass transition temperature (∼41-45 °C), decohesion was characterized by brittle failure via molecular bond rupture. Above the glass transition temperature, decohesion growth occurred by a viscoelastic process in the BHJ layer, leading to a significant degree of viscoelastic deformation. We develop a viscoelastic model based on molecular relaxation to describe the resulting behavior. The study has implications for OSC long-term reliability and device performance, which are important for OSC production and implementation.
Citation:
Bruner C, Novoa F, Dupont S, Dauskardt R (2014) Decohesion Kinetics in Polymer Organic Solar Cells. ACS Applied Materials & Interfaces 6: 21474–21483. Available: http://dx.doi.org/10.1021/am506482q.
Publisher:
American Chemical Society (ACS)
Journal:
ACS Applied Materials & Interfaces
KAUST Grant Number:
KUS-C1-015-21
Issue Date:
10-Dec-2014
DOI:
10.1021/am506482q
PubMed ID:
25369109
Type:
Article
ISSN:
1944-8244; 1944-8252
Sponsors:
This work was supported by the Center for Advanced Molecular Photovoltaics (CAMP) under the King Abdullah University of Science and Technology (KAUST) under award no. KUS-C1-015-21.
Appears in Collections:
Publications Acknowledging KAUST Support

Full metadata record

DC FieldValue Language
dc.contributor.authorBruner, Christopheren
dc.contributor.authorNovoa, Fernandoen
dc.contributor.authorDupont, Stephanieen
dc.contributor.authorDauskardt, Reinholden
dc.date.accessioned2016-02-25T12:58:54Zen
dc.date.available2016-02-25T12:58:54Zen
dc.date.issued2014-12-10en
dc.identifier.citationBruner C, Novoa F, Dupont S, Dauskardt R (2014) Decohesion Kinetics in Polymer Organic Solar Cells. ACS Applied Materials & Interfaces 6: 21474–21483. Available: http://dx.doi.org/10.1021/am506482q.en
dc.identifier.issn1944-8244en
dc.identifier.issn1944-8252en
dc.identifier.pmid25369109en
dc.identifier.doi10.1021/am506482qen
dc.identifier.urihttp://hdl.handle.net/10754/597920en
dc.description.abstract© 2014 American Chemical Society. We investigate the role of molecular weight (MW) of the photoactive polymer poly(3-hexylthiophene) (P3HT) on the temperature-dependent decohesion kinetics of bulk heterojunction (BHJ) organic solar cells (OSCs). The MW of P3HT has been directly correlated to its carrier field effect mobilities and the ambient temperature also affects OSC in-service performance and P3HT arrangement within the BHJ layer. Under inert conditions, time-dependent decohesion readily occurs within the BHJ layer at loads well below its fracture resistance. We observe that by increasing the MW of P3HT, greater resistance to decohesion is achieved. However, failure consistently occurs within the BHJ layer representing the weakest layer within the device stack. Additionally, it was found that at temperatures below the glass transition temperature (∼41-45 °C), decohesion was characterized by brittle failure via molecular bond rupture. Above the glass transition temperature, decohesion growth occurred by a viscoelastic process in the BHJ layer, leading to a significant degree of viscoelastic deformation. We develop a viscoelastic model based on molecular relaxation to describe the resulting behavior. The study has implications for OSC long-term reliability and device performance, which are important for OSC production and implementation.en
dc.description.sponsorshipThis work was supported by the Center for Advanced Molecular Photovoltaics (CAMP) under the King Abdullah University of Science and Technology (KAUST) under award no. KUS-C1-015-21.en
dc.publisherAmerican Chemical Society (ACS)en
dc.subjectfractureen
dc.subjectfullerenesen
dc.subjectpolymeren
dc.subjectsolar cellsen
dc.subjectthin filmsen
dc.titleDecohesion Kinetics in Polymer Organic Solar Cellsen
dc.typeArticleen
dc.identifier.journalACS Applied Materials & Interfacesen
dc.contributor.institutionDurand Building, Stanford, United Statesen
kaust.grant.numberKUS-C1-015-21en
kaust.grant.fundedcenterCenter for Advanced Molecular Photovoltaics (CAMP)en

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