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Damp heat induced degradation mechanisms occurring in coloured oxide/metal/oxide films for thin-film solar cells

Theelen, M. and Hagedoorn, C. and Götz-Köhler, Maximilian and Weeber, A. and Neugebohrn, Nils (2021) Damp heat induced degradation mechanisms occurring in coloured oxide/metal/oxide films for thin-film solar cells. Thin Solid Films, 730, p. 138711. Elsevier. doi: 10.1016/j.tsf.2021.138711. ISSN 0040-6090.

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Official URL: http://dx.doi.org/10.1016/j.tsf.2021.138711


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.

Item URL in elib:https://elib.dlr.de/145090/
Document Type:Article
Title:Damp heat induced degradation mechanisms occurring in coloured oxide/metal/oxide films for thin-film solar cells
AuthorsInstitution or Email of AuthorsAuthor's ORCID iDORCID Put Code
Götz-Köhler, MaximilianUNSPECIFIEDhttps://orcid.org/0000-0002-6078-4359UNSPECIFIED
Neugebohrn, NilsUNSPECIFIEDhttps://orcid.org/0000-0002-3335-7861UNSPECIFIED
Date:4 May 2021
Journal or Publication Title:Thin Solid Films
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
Page Range:p. 138711
Keywords:Transparent conductive oxide, Aluminium-doped zinc oxide, Silver, Damp heat degradation, Oxide/metal/oxide structure, Colour, Elemental migration
HGF - Research field:Energy
HGF - Program:Energy System Design
HGF - Program Themes:Digitalization and System Technology
DLR - Research area:Energy
DLR - Program:E SY - Energy System Technology and Analysis
DLR - Research theme (Project):E - Energy System Technology
Location: Oldenburg
Institutes and Institutions:Institute of Networked Energy Systems > Urban and Residential Technologies
Deposited By: Götz, Maximilian
Deposited On:09 Nov 2021 09:48
Last Modified:09 Nov 2021 09:48

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