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Novel Concepts for High-Efficiency Lightweight Space Solar Cells

Cappelluti, F; Ghione, G; Gioannini, M; Bauhuis, G; Mulder, P; Schermer, J; Cimino, M; ... Liu, H; + view all (2017) Novel Concepts for High-Efficiency Lightweight Space Solar Cells. In: Fernandez, A, (ed.) Proceedings of the 11th European Space Power Conference (ESPC). (pp. 03007). EDP Sciences Green open access

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Abstract

One of the key issues in the design and development of a satellite Photovoltaic Assembly (PVA) is the trade-off to be made between the available volume located to the PVA, its mass and the total amount of power that the solar panels have to guarantee to the spacecraft. The development of high-efficiency, flexible, lightweight solar cells is therefore instrumental to the design of future satellites providing enhanced missions and services. Based on the consolidated development of GaAs-based single junction and lattice matched triple-junction solar cells, several research efforts are being pursued worldwide to further increase the efficiency and reduce mass. Promising approaches include thin-film technologies such as Inverted Metamorphic and Epitaxial Lift-Off (ELO), and the use of nanostructures or highly mismatched alloys grown by MBE. We propose here an alternative path towards the development of lightweight GaAs-based solar cells with the potential to exceed the Shockley-Queisser (SQ) limit of single junction cells. Our approach is based on the synergistic combination of thin-film design, quantum dots (QDs) absorption, and photonic nanostructures. Challenges and opportunities offered by the use of QDs are discussed. A cost-effective and scalable fabrication process including ELO technology and nanoimprint lithography is outlined. Finally, a proof-of-concept design, based on rigorous electromagnetic and physics-based simulations, is presented. Efficiency higher than 30% and weight reduction close to 90% - owing to the substrate removal - makes the proposed device to rank record power-to-weight ratio, with the potential to become a cost-effective, attractive option for next generation space solar cells.

Type: Proceedings paper
Title: Novel Concepts for High-Efficiency Lightweight Space Solar Cells
Event: 11th European Space Power Conference (ESPC)
Location: Thessaloniki, GREECE
Dates: 03 October 2016 - 07 October 2016
Open access status: An open access version is available from UCL Discovery
DOI: 10.1051/e3sconf/20171603007
Publisher version: http://dx.doi.org/10.1051/e3sconf/20171603007
Language: English
Additional information: This is an Open Access article distributed under the terms of the Creative Commons Attribution License 4.0, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Keywords: SHOCKLEY-QUEISSER LIMIT
UCL classification: UCL > School of BEAMS
UCL > School of BEAMS > Faculty of Engineering Science
URI: http://discovery.ucl.ac.uk/id/eprint/1573437
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