Ultrafast pump-probe reflectance spectroscopy: Why sodium makes Cu(In,Ga)Se2 solar cells better

Handle URI:
http://hdl.handle.net/10754/575353
Title:
Ultrafast pump-probe reflectance spectroscopy: Why sodium makes Cu(In,Ga)Se2 solar cells better
Authors:
Eid, Jessica; Usman, Anwar; Gereige, Issam; Duren, Jeroen Van; Lyssenko, Vadim; Leo, Karl; Mohammed, Omar F. ( 0000-0001-8500-1130 )
Abstract:
Although 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.
KAUST Department:
Solar and Photovoltaic Engineering Research Center (SPERC); Physical Sciences and Engineering (PSE) Division
Citation:
Ultrafast pump-probe reflectance spectroscopy: Why sodium makes Cu(In,Ga)Se2 solar cells better 2015, 140:33 Solar Energy Materials and Solar Cells
Publisher:
Elsevier BV
Journal:
Solar Energy Materials and Solar Cells
Issue Date:
14-Apr-2015
DOI:
10.1016/j.solmat.2015.03.029
Type:
Article
ISSN:
09270248
Additional Links:
http://linkinghub.elsevier.com/retrieve/pii/S092702481500152X
Appears in Collections:
Articles; Physical Sciences and Engineering (PSE) Division; Solar and Photovoltaic Engineering Research Center (SPERC)

Full metadata record

DC FieldValue Language
dc.contributor.authorEid, Jessicaen
dc.contributor.authorUsman, Anwaren
dc.contributor.authorGereige, Issamen
dc.contributor.authorDuren, Jeroen Vanen
dc.contributor.authorLyssenko, Vadimen
dc.contributor.authorLeo, Karlen
dc.contributor.authorMohammed, Omar F.en
dc.date.accessioned2015-08-20T10:58:45Zen
dc.date.available2015-08-20T10:58:45Zen
dc.date.issued2015-04-14en
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 Cellsen
dc.identifier.issn09270248en
dc.identifier.doi10.1016/j.solmat.2015.03.029en
dc.identifier.urihttp://hdl.handle.net/10754/575353en
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.en
dc.publisherElsevier BVen
dc.relation.urlhttp://linkinghub.elsevier.com/retrieve/pii/S092702481500152Xen
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.2015.03.029en
dc.subjectCIGS solar cellsen
dc.subjectUltrafast photophysicsen
dc.subjectPump-probe reflectance spectroscopyen
dc.subjectCarrier recombinationen
dc.subjectDielectric function modelen
dc.titleUltrafast pump-probe reflectance spectroscopy: Why sodium makes Cu(In,Ga)Se2 solar cells betteren
dc.typeArticleen
dc.contributor.departmentSolar and Photovoltaic Engineering Research Center (SPERC)en
dc.contributor.departmentPhysical Sciences and Engineering (PSE) Divisionen
dc.identifier.journalSolar Energy Materials and Solar Cellsen
dc.eprint.versionPost-printen
dc.contributor.institutionIntermolecular, Inc., San Jose, CA, USAen
dc.contributor.institutionInstitut für Angewandte Photophysik, Technische Universität Dresden, 01062 Dresden, Germanyen
kaust.authorEid, Jessicaen
kaust.authorUsman, Anwaren
kaust.authorGereige, Issamen
kaust.authorLeo, Karlen
kaust.authorMohammed, Omar F.en
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