Print Email Facebook Twitter Influence of deposition pressure and selenisation on damp heat degradation of the Cu(In,Ga)Se2 back contact molybdenum Title Influence of deposition pressure and selenisation on damp heat degradation of the Cu(In,Ga)Se2 back contact molybdenum Author Theelen, M.J. Polman, K.J. Tomassini, M. Barreau, N. Steijvers, H.L.A.H. van Berkum, J. Vroon, Z.A.E.P. Zeman, M. Publication year 2014 Abstract The impact of the molybdenum (Mo) microstructure and selenisation on degradation caused by 105hour exposure to standard 'damp heat' has been investigated. Degradation effects were already observed without magnification after several hours of exposure. The degradation resulted in large volume expansion due to the formation of a thick non-conductive MoOx layer consisting of various oxides and suboxides on top of the metallic molybdenum. This MoOx layer showed cracks and the appearance of needle-like structures.The degradation effect was the most severe for layers with the highest sputter pressure and thus the most porous microstructure. This can be attributed to higher mobility of the degrading species in the intergranular material (like MoOx) than in metallic Mo. The effect of selenisation was observed in the visual and optical characteristics - the dense selenised molybdenum layer retained the highest reflectance. Likely, the presence of MoSe2 prevented rapid oxidation of the Mo. cop. 2014 Elsevier B.V. Subject Mechanics, Materials and StructuresTFT - Thin Film TechnologyTS - Technical SciencesMaterials ChemistryIndustrial InnovationCIGS solar cellsDamp heatDegradationMolybdenum oxideSelenisationMolybdenum To reference this document use: http://resolver.tudelft.nl/uuid:c90d6147-b649-42f9-866c-d595e9f8b14a DOI https://doi.org/10.1016/j.surfcoat.2014.05.001 TNO identifier 507075 Publisher Elsevier ISSN 0257-8972 Source Surface and Coatings Technology, 252, 157-167 Document type article Files To receive the publication files, please send an e-mail request to TNO Library.