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Cu-depleted patches induced by presence of K during growth of CIGS absorbers
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Electronics. (Thin Film Solar Cells)ORCID iD: 0000-0002-2101-3746
Stockholm University, Department of Materials and Environmental Chemistry 106 91 Stockholm.
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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2017 (English)Conference paper, Oral presentation with published abstract (Other academic)
Abstract [en]

The conversion efficiency of the CIGS thin film solar cells has rapidly increased since introduction of the heavier alkali-doping (K, Rb, Cs). While the exclusive introduction of Na in the CIGS films has led to efficiencies up to 20,4% 1, the latest K, Rb or Cs post deposition treatments (PDT) have increased the efficiency to 22,6% 2. The exact role of this heavy-alkali PDT is still under discussion but three explanations have been discussed in the literature. First, that the heavy alkali PDT facilitates CdCu substitution, that results in an enhanced absorber type inversion, moving the p-n junction further into the CIGS bulk 3. Second, that the main effect from heavy alkali PDT is due to the formation of a K-In-Se2 layer, that passivates defects at the CIGS surface, reducing interface recombination 4. And third, that the heavy alkali PDT induces a Cu depletion at the surface of the CIGS which, by increasing the local Fermi level, increases the band bending; thus creating a higher potential barrier for holes to recombine 5.

Place, publisher, year, edition, pages
2017.
National Category
Energy Systems Other Materials Engineering
Identifiers
URN: urn:nbn:se:uu:diva-335110OAI: oai:DiVA.org:uu-335110DiVA: diva2:1161672
Conference
34th European PV Solar Energy Conference and Exhibition (EUPVSEC) 2017
Available from: 2017-11-30 Created: 2017-11-30 Last updated: 2017-12-13Bibliographically approved

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http://www.eupvsec-planner.com/presentations/c42159/cu-depleted_grains_induced_by_the_presence_of_heavy-alkali_during_the_growth_of_the_cigs_absorber.htm

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Donzel-Gargand, OlivierKeller, JanTörndahl, TobiasLarsson, FredrikStolt, LarsEdoff, Marika

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