Space environmental testing of flexible coverglass alternatives based on siloxanes |
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Authors: | NJ Smeenk C Mooney J Feenstra P Mulder T Rohr COA Semprimoschnig E Vlieg JJ Schermer |
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Institution: | 1. Radboud University Nijmegen, Institute for Molecules and Materials, Heyendaalseweg 135, 6525 AJ Nijmegen, The Netherlands;2. European Space Agency, ESTEC, Keplerlaan 1, 2200 AG Noordwijk, The Netherlands |
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Abstract: | With the development of thin-film, high-efficient III–V solar cells using the epitaxial lift-off technique, flexible solar panels for space applications can be designed. Besides new deployment options, this also reduces the mass and thus launch costs of a satellite. One requirement for such a flexible panel configuration is the replacement of the brittle coverglass, which shields the solar cells from the harsh space environment, by a flexible alternative. In this work we have tested several compositions of a polysiloxane candidate material for a flexible shielding layer by exposing them to high energy UV and electron radiation at elevated temperatures. It was found that irradiation by electrons with a fluence corresponding to 15 years in space produces little degradation. UV radiation, on the other hand, has a more pronounced impact on the material properties, causing a discolouration of the transparent material and for some compositions even cracking of the samples. |
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Keywords: | Siloxanes UV degradation Electron irradiation Discolouration |
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