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Cadmium Free Cu2ZnSnS4 Solar Cells with 9.7% Efficiency
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.ORCID iD: 0000-0002-7392-4701
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.ORCID iD: 0000-0002-3162-4292
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics.
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2019 (English)In: Advanced Energy Material, ISSN 1614-6832, Vol. 9, no 21, article id 1900439Article in journal (Refereed) Published
Abstract [en]

Cu2ZnSnS4(CZTS) thin-film solar cell absorbers with different bandgaps can be produced by parameter variation during thermal treatments. Here, the effects of varied annealing time in a sulfur atmosphere and an ordering treatment of the absorber are compared. Chemical changes in the surface due to ordering are examined, and a downshift of the valence band edge is observed. With the goal to obtain different band alignments, these CZTS absorbers are combined with Zn1−xSnxOy (ZTO) or CdS buffer layers to produce complete devices. A high open circuit voltage of 809 mV is obtained for an ordered CZTS absorber with CdS buffer layer, while a 9.7% device is obtained utilizing a Cd free ZTO buffer layer. The best performing devices are produced with a very rapid 1 min sulfurization, resulting in very small grains.

Place, publisher, year, edition, pages
2019. Vol. 9, no 21, article id 1900439
Keywords [en]
Cu2ZnSnS4, thermal treatment, thin-film solar cells, valence bands
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-382533DOI: 10.1002/aenm.201900439ISI: 000470925900010OAI: oai:DiVA.org:uu-382533DiVA, id: diva2:1307364
Funder
Swedish Energy Agency, 2017-004796Swedish Foundation for Strategic Research , RMA15-0030Swedish Foundation for Strategic Research , FFL12-0178Available from: 2019-04-26 Created: 2019-04-26 Last updated: 2019-07-05Bibliographically approved

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Larsen, Jes KLarsson, FredrikTörndahl, TobiasSaini, NishantRiekehr, LarsRen, YiPlatzer Björkman, Charlotte
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Solid State Electronics
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