Print Email Facebook Twitter Damp heat induced degradation mechanisms occurring in coloured oxide/metal/oxide films for thin-film solar cells Title Damp heat induced degradation mechanisms occurring in coloured oxide/metal/oxide films for thin-film solar cells Author Theelen, M.J. Hagedoorn, C. Götz-Köhler, M. Weeber, A. Neugebohn, N. Publication year 2021 Abstract Oxide/metal/oxide (OMO) layer stacks are promising replacements for conventional transparent conductive oxides in thin-film photovoltaics. They can provide colouration of the solar cells by adjusting their thickness to optimised optical resonances. Green OMO multistacks were deposited on glass by subsequent sputtering of aluminium doped zinc oxide (ZnO:Al), silver (Ag) and ZnO:Al. Part of these samples were packaged. In order to study their degradation behaviour and identify possible degradation mechanisms, samples were exposed to either damp or dry heat. It was observed that the conductivity of non-packaged OMO films in damp heat increased during the first 30 h, while complete loss of conductivity occurred after ~50 h. Analysis of the optical properties showed that the green colour had disappeared after 600 h of exposure to damp heat. These degradation effects seemed to be caused by the formation of silver spheres, leading to stack rupturing. In contrast, dry heat samples experienced no visual changes or sudden loss of conductivity. Similarly, packaged samples only slightly degraded along the edges after 600 h of damp heat exposure. This indicates that moisture plays a key role in the degradation mechanism of the coloured OMO. It is likely that moisture diffusion resulted in the increased mobility and agglomeration of the silver layer. The OMO layers are thus likely stable under adequate packaging. Subject Aluminium-doped zinc oxideColourDamp heat degradationElemental migrationOxide/metal/oxide structureSilverTransparent conductive oxideIndustrial Innovation To reference this document use: http://resolver.tudelft.nl/uuid:15cdf610-441b-4694-8b3c-9a561d8b0f5a DOI https://doi.org/10.1016/j.tsf.2021.138711 TNO identifier 956524 Publisher Elsevier ISSN 0040-6090 Source Thin Solid Films Document type article Files To receive the publication files, please send an e-mail request to TNO Library.