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dc.contributor.authorEid, Jessica
dc.contributor.authorUsman, Anwar
dc.contributor.authorGereige, Issam
dc.contributor.authorDuren, Jeroen Van
dc.contributor.authorLyssenko, Vadim
dc.contributor.authorLeo, Karl
dc.contributor.authorMohammed, Omar F.
dc.date.accessioned2015-08-20T10:58:45Z
dc.date.available2015-08-20T10:58:45Z
dc.date.issued2015-04-14
dc.identifier.citationUltrafast pump-probe reflectance spectroscopy: Why sodium makes Cu(In,Ga)Se2 solar cells better 2015, 140:33 Solar Energy Materials and Solar Cells
dc.identifier.issn09270248
dc.identifier.doi10.1016/j.solmat.2015.03.029
dc.identifier.urihttp://hdl.handle.net/10754/575353
dc.description.abstractAlthough Cu(In,Ga)Se2 (CIGS) solar cells have the highest efficiency of any thin-film solar cell, especially when sodium is incorporated, the fundamental device properties of ultrafast carrier transport and recombination in such cells remain not fully understood. Here, we explore the dynamics of charge carriers in CIGS absorber layers with varying concentrations of Na by femtosecond (fs) broadband pump-probe reflectance spectroscopy with 120 fs time resolution. By analyzing the time-resolved transient spectra in a different time domain, we show that a small amount of Na integrated by NaF deposition on top of sputtered Cu(In,Ga) prior to selenization forms CIGS, which induces slower recombination of the excited carriers. Here, we provide direct evidence for the elongation of carrier lifetimes by incorporating Na into CIGS.
dc.publisherElsevier BV
dc.relation.urlhttp://linkinghub.elsevier.com/retrieve/pii/S092702481500152X
dc.rightsNOTICE: this is the author’s version of a work that was accepted for publication in Solar Energy Materials and Solar Cells. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. A definitive version was subsequently published in Solar Energy Materials and Solar Cells, 14 April 2015. DOI: 10.1016/j.solmat.2015.03.029
dc.subjectCIGS solar cells
dc.subjectUltrafast photophysics
dc.subjectPump-probe reflectance spectroscopy
dc.subjectCarrier recombination
dc.subjectDielectric function model
dc.titleUltrafast pump-probe reflectance spectroscopy: Why sodium makes Cu(In,Ga)Se2 solar cells better
dc.typeArticle
dc.contributor.departmentChemical Science Program
dc.contributor.departmentKAUST Solar Center (KSC)
dc.contributor.departmentPhysical Science and Engineering (PSE) Division
dc.contributor.departmentUltrafast Laser Spectroscopy and Four-dimensional Electron Imaging Research Group
dc.identifier.journalSolar Energy Materials and Solar Cells
dc.eprint.versionPost-print
dc.contributor.institutionIntermolecular, Inc., San Jose, CA, USA
dc.contributor.institutionInstitut für Angewandte Photophysik, Technische Universität Dresden, 01062 Dresden, Germany
kaust.personEid, Jessica
kaust.personUsman, Anwar
kaust.personGereige, Issam
kaust.personLeo, Karl
kaust.personMohammed, Omar F.
refterms.dateFOA2017-04-14T00:00:00Z
dc.date.published-online2015-04-14
dc.date.published-print2015-09


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