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Title: Degradation of interfacial adhesion strength within photovoltaic mini-modules during damp-heat exposure
Authors: Wu, Dan
Zhu, Jiang
Betts, Thomas R.
Gottschalg, Ralph
Keywords: Adhesion strength
Damp heat
Peel test
Humidity dose
Issue Date: 2014
Publisher: John Wiley and Sons Ltd / © The Authors
Citation: WU, D. ... et al, 2014. Degradation of interfacial adhesion strength within photovoltaic mini-modules during damp-heat exposure. Progress in Photovoltaics: Research and Applications, 22 (7), pp.796-809.
Abstract: The degradation of adhesion strength between the back sheet and encapsulant due to moisture penetration has been investigated for commercial crystalline silicon photovoltaic mini-modules. The damp-heat tests originating from the International Electrotechnical Commission qualification test were carried out at five different temperature and relative humidity (RH) conditions (95 °C/85% RH, 85 °C/85% RH, 65 °C/85% RH, 85 °C/65% RH and 85 °C/45% RH). The adhesion strength was measured by 90° peel tests, carried out at specified time intervals during degradation. Several visible defects were observed, including delamination, moisture ingress and bubble formation. The adhesion strength showed a stretched exponential decay with time, and significant influence of test conditions was demonstrated. A humidity dose model was proposed by assuming micro-climates seen by the modules, that is, surface relative humidity of the back sheet as the driving factor for an Arrhenius-based model using temperature as accelerating factor. The correlation between adhesion strength degradation and humidity dose was investigated through linear and exponential models. Results showed that the conventional linear model failed to represent the relationship while the exponential model fitted to this correlation with extracted activation energy (Ea) of around 63 kJ/mol. This provides a model for the estimation of adhesion strength decay in dependence of the humidity conditions.
Description: This is an Open Access Article. It is published by John Wiley and Sons Ltd under the Creative Commons Attribution 3.0 Unported Licence (CC BY). Full details of this licence are available at: http://creativecommons.org/licenses/by/3.0/
Sponsor: This work has been supported by a joint UK–India initiative in solar energy through a joint project ‘Stability and Performance of Photovoltaics (STAPP)’ funded by the Research Councils UK (RCUK) Energy Programme [contract no: EP/H040331/1] and by the Department of Science and Technology (DST) in India.
Version: Published
DOI: 10.1002/pip.2460
URI: https://dspace.lboro.ac.uk/2134/14188
Publisher Link: http://dx.doi.org/10.1002/pip.2460
ISSN: 1062-7995
Appears in Collections:Published Articles (Mechanical, Electrical and Manufacturing Engineering)

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