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CdS and Zn1-xSnxOy buffer layers for CIGS solar cells
Int Iberian Nanotechnol Lab, P-4715330 Braga, Portugal..
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.
Univ Aveiro, Dept Fis & I3N, P-3810193 Aveiro, Portugal..
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2017 (English)In: Solar Energy Materials and Solar Cells, ISSN 0927-0248, E-ISSN 1879-3398, Vol. 159, 272-281 p.Article in journal (Refereed) Published
Abstract [en]

Thin film solar cells based on Cu(In,Ga)Se-2 (CIGS), where just the buffer layer is changed, were fabricated and studied. The effects of two different buffer layers, CdS and Zn1-xSnxOy (ZnSnO), are compared using several characterization techniques. We compared both devices and observe that the ZnSnO-based solar cells have similar values of power conversion efficiency as compared to the cells with CdS buffer layers. The ZnSnO-based devices have higher values in the short-circuit current (6) that compensate for lower values in fill factor (FF) and open circuit voltage (V-oc) than CdS based devices. Kelvin probe force microscopy (KPFM) results indicate that CdS provides junctions with slightly higher surface photovoltage (SPV) than ZnSnO, thus explaining the lower Voc potential for the ZnSnO sample. The TEM analysis shows a poly-crystalline ZnSnO layer and we have not detected any strong evidence of diffusion of Zn or Sn into the CIGS. From the photoluminescence measurements, we concluded that both samples are being affected by fluctuating potentials, although this effect is higher for the CdS sample.

Place, publisher, year, edition, pages
2017. Vol. 159, 272-281 p.
Keyword [en]
Thin film solar cells, Cu(In, Ga)Se-2 (CIGS), Buffer layers, CdS, Zn1-xSnxOy
National Category
Condensed Matter Physics
Identifiers
URN: urn:nbn:se:uu:diva-310732DOI: 10.1016/j.solmat.2016.09.023ISI: 000388053600032OAI: oai:DiVA.org:uu-310732DiVA: diva2:1058276
Funder
EU, European Research Council, 327367Swedish Energy Agency, 2012-004591VINNOVA, 2013-02199StandUp
Available from: 2016-12-20 Created: 2016-12-19 Last updated: 2016-12-20Bibliographically approved

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Keller, JanTörndahl, TobiasEdoff, Marika
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