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dc.contributor.authorSachs-Quintana, I. T.
dc.contributor.authorHeumüller, Thomas
dc.contributor.authorMateker, William R.
dc.contributor.authorOrozco, Darian E.
dc.contributor.authorCheacharoen, Rongrong
dc.contributor.authorSweetnam, Sean
dc.contributor.authorBrabec, Christoph J.
dc.contributor.authorMcGehee, Michael D.
dc.date.accessioned2016-02-25T13:13:32Z
dc.date.available2016-02-25T13:13:32Z
dc.date.issued2014-03-24
dc.identifier.citationSachs-Quintana IT, Heumüller T, Mateker WR, Orozco DE, Cheacharoen R, et al. (2014) Electron Barrier Formation at the Organic-Back Contact Interface is the First Step in Thermal Degradation of Polymer Solar Cells. Advanced Functional Materials 24: 3978–3985. Available: http://dx.doi.org/10.1002/adfm.201304166.
dc.identifier.issn1616-301X
dc.identifier.doi10.1002/adfm.201304166
dc.identifier.urihttp://hdl.handle.net/10754/598145
dc.description.abstractLong-term stability of polymer solar cells is determined by many factors, one of which is thermal stability. Although many thermal stability studies occur far beyond the operating temperature of a solar cell which is almost always less than 65 °C, thermal degradation is studied at temperatures that the solar cell would encounter in real-world operating conditions. At these temperatures, movement of the polymer and fullerenes, along with adhesion of the polymer to the back contact, creates a barrier for electron extraction. The polymer barrier can be removed and the performance can be restored by peeling off the electrode and depositing a new one. X-ray photoelectron spectroscopy measurements reveal a larger amount of polymer adhered to electrodes peeled from aged devices than electrodes peeled from fresh devices. The degradation caused by hole-transporting polymer adhering to the electrode can be suppressed by using an inverted device where instead of electrons, holes are extracted at the back metal electrode. The problem can be ultimately eliminated by choosing a polymer with a high glass transition temperature. © 2014 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim.
dc.description.sponsorshipThe authors would like to acknowledge Koen Vandewal, and Chuck Hitzman for sharing their expertise on sub-bandgap EQE, and XPS, respectively. The authors would also like to thank Christine McGuiness at Plextronics for supplying ICBA and for her helpful discussions. TH gratefully acknowledges the "DAAD Doktorantenstipedium" and the SFB 953 "Synthetic Carbon Allotropes" This publication was based on work supported by the Center for Advanced Molecular Photovoltaics (CAMP) (Award No KUS-C1-015-21), made by King Abdullah University of Science and Technology (KAUST).
dc.publisherWiley
dc.subjectdegradation
dc.subjectinterfaces
dc.subjectlifetime
dc.subjectorganic photovoltaics
dc.subjectstability
dc.titleElectron Barrier Formation at the Organic-Back Contact Interface is the First Step in Thermal Degradation of Polymer Solar Cells
dc.typeArticle
dc.identifier.journalAdvanced Functional Materials
dc.contributor.institutionDepartment of Materials Science and Engineering; Stanford University; Stanford CA 94305 USA
dc.contributor.institutionInstitute of Materials for Electronics and Energy Technology (I-MEET); Friedrich-Alexander-University Erlangen-Nuremberg; Martensstrasse 7 91058 Erlangen Germany
dc.contributor.institutionBavarian Center for Applied Energy Research (ZAE Bayern); Haberstrasse 2a 91058 Erlangen Germany
kaust.grant.numberKUS-C1-015-21
kaust.grant.fundedcenterCenter for Advanced Molecular Photovoltaics (CAMP)
dc.date.published-online2014-03-24
dc.date.published-print2014-07


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