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dc.contributor.authorMateker, William R.
dc.contributor.authorDouglas, Jessica D.
dc.contributor.authorCabanetos, Clement
dc.contributor.authorSachs-Quintana, I. T.
dc.contributor.authorBartelt, Jonathan A.
dc.contributor.authorHoke, Eric T.
dc.contributor.authorEl Labban, Abdulrahman
dc.contributor.authorBeaujuge, Pierre
dc.contributor.authorFrechet, Jean
dc.contributor.authorMcGehee, Michael D.
dc.date.accessioned2015-08-03T10:41:18Z
dc.date.available2015-08-03T10:41:18Z
dc.date.issued2013
dc.identifier.issn17545692
dc.identifier.doi10.1039/c3ee41328d
dc.identifier.urihttp://hdl.handle.net/10754/562523
dc.description.abstractWhile bulk heterojunction (BHJ) solar cells fabricated from high M n PBDTTPD achieve power conversion efficiencies (PCE) as high as 7.3%, the short-circuit current density (JSC) of these devices can drop by 20% after seven days of storage in the dark and under inert conditions. This degradation is characterized by the appearance of S-shape features in the reverse bias region of current-voltage (J-V) curves that increase in amplitude over time. Conversely, BHJ solar cells fabricated from low Mn PBDTTPD do not develop S-shaped J-V curves. However, S-shapes identical to those observed in high Mn PBDTTPD solar cells can be induced in low M n devices through intentional contamination with the TPD monomer. Furthermore, when high Mn PBDTTPD is purified via size exclusion chromatography (SEC) to reduce the content of low molecular weight species, the JSC of polymer devices is significantly more stable over time. After 111 days of storage in the dark under inert conditions, the J-V curves do not develop S-shapes and the JSC degrades by only 6%. The S-shape degradation feature, symptomatic of low device lifetimes, appears to be linked to the presence of low molecular weight contaminants, which may be trapped within samples of high Mn polymer that have not been purified by SEC. Although these impurities do not affect initial device PCE, they significantly reduce device lifetime, and solar cell stability is improved by increasing the purity of the polymer materials. © 2013 The Royal Society of Chemistry.
dc.description.sponsorshipThe authors acknowledge Dr George Burkhard, Jason Bloking, and Plextronics for helpful discussions. We acknowledge the synthetic contribution of Dr Shiming Zhang in the photovoltaic polymer program at KAUST. This work was supported by the Center for Advanced Molecular Photovoltaics (CAMP) (Award no KUS-C1-015-21) made possible by the King Abdullah University of Science and Technology (KAUST). I. T. S. Q. was supported by the National Science Foundation Graduate Research Fellowship. J.A.B acknowledges additional funding from the National Defense Science and Engineering Fellowship. Additional support was provided for E. T. H. by the Fannie and John Hertz Foundation.
dc.publisherRoyal Society of Chemistry (RSC)
dc.titleImproving the long-term stability of PBDTTPD polymer solar cells through material purification aimed at removing organic impurities
dc.typeArticle
dc.contributor.departmentChemical Science Program
dc.contributor.departmentKAUST Solar Center (KSC)
dc.contributor.departmentMaterial Science and Engineering Program
dc.contributor.departmentOffice of the VP
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.identifier.journalEnergy and Environmental Science
dc.contributor.institutionDepartment of Materials Science and Engineering, Stanford University, Stanford CA 94305, United States
dc.contributor.institutionDepartment of Chemistry, University of California, Berkeley CA 94720, United States
dc.contributor.institutionDepartment of Applied Physics, Stanford University, Stanford CA 94305, United States
kaust.personCabanetos, Clement
kaust.personEl Labban, Abdulrahman
kaust.personBeaujuge, Pierre
kaust.personFrechet, Jean
kaust.grant.numberKUS-C1-015-21
kaust.acknowledged.supportUnitCenter for Advanced Molecular Photovoltaics (CAMP)


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