Electron Barrier Formation at the Organic-Back Contact Interface is the First Step in Thermal Degradation of Polymer Solar Cells

Handle URI:
http://hdl.handle.net/10754/598145
Title:
Electron Barrier Formation at the Organic-Back Contact Interface is the First Step in Thermal Degradation of Polymer Solar Cells
Authors:
Sachs-Quintana, I. T.; Heumüller, Thomas; Mateker, William R.; Orozco, Darian E.; Cheacharoen, Rongrong; Sweetnam, Sean; Brabec, Christoph J.; McGehee, Michael D.
Abstract:
Long-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.
Citation:
Sachs-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.
Publisher:
Wiley-Blackwell
Journal:
Advanced Functional Materials
KAUST Grant Number:
KUS-C1-015-21
Issue Date:
24-Mar-2014
DOI:
10.1002/adfm.201304166
Type:
Article
ISSN:
1616-301X
Sponsors:
The 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).
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Full metadata record

DC FieldValue Language
dc.contributor.authorSachs-Quintana, I. T.en
dc.contributor.authorHeumüller, Thomasen
dc.contributor.authorMateker, William R.en
dc.contributor.authorOrozco, Darian E.en
dc.contributor.authorCheacharoen, Rongrongen
dc.contributor.authorSweetnam, Seanen
dc.contributor.authorBrabec, Christoph J.en
dc.contributor.authorMcGehee, Michael D.en
dc.date.accessioned2016-02-25T13:13:32Zen
dc.date.available2016-02-25T13:13:32Zen
dc.date.issued2014-03-24en
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.en
dc.identifier.issn1616-301Xen
dc.identifier.doi10.1002/adfm.201304166en
dc.identifier.urihttp://hdl.handle.net/10754/598145en
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.en
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).en
dc.publisherWiley-Blackwellen
dc.subjectdegradationen
dc.subjectinterfacesen
dc.subjectlifetimeen
dc.subjectorganic photovoltaicsen
dc.subjectstabilityen
dc.titleElectron Barrier Formation at the Organic-Back Contact Interface is the First Step in Thermal Degradation of Polymer Solar Cellsen
dc.typeArticleen
dc.identifier.journalAdvanced Functional Materialsen
dc.contributor.institutionDepartment of Materials Science and Engineering; Stanford University; Stanford CA 94305 USAen
dc.contributor.institutionInstitute of Materials for Electronics and Energy Technology (I-MEET); Friedrich-Alexander-University Erlangen-Nuremberg; Martensstrasse 7 91058 Erlangen Germanyen
dc.contributor.institutionBavarian Center for Applied Energy Research (ZAE Bayern); Haberstrasse 2a 91058 Erlangen Germanyen
kaust.grant.numberKUS-C1-015-21en
kaust.grant.fundedcenterCenter for Advanced Molecular Photovoltaics (CAMP)en
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