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Potential analysis of a rear-side passivation for multi-junction space solar cells based on germanium substrates

: Weiss, Charlotte; Schön, Jonas; Höhn, Oliver; Mohr, Christian; Kurstjens, Rufi; Boizot, Bruno; Janz, Stefan

Postprint urn:nbn:de:0011-n-5071154 (518 KByte PDF)
MD5 Fingerprint: cf22ef35fca1ecf5301ce261c630fc2a
Erstellt am: 7.9.2018

Institute of Electrical and Electronics Engineers -IEEE-:
IEEE 7th World Conference on Photovoltaic Energy Conversion, WCPEC 2018 : A Joint Conference of 45th IEEE PVSC, 28th PVSEC & 34th EU PVSEC, 10-15 June 2018, Waikoloa Village, HI, USA
Piscataway, NJ: IEEE, 2018
ISBN: 978-1-5386-8529-7
ISBN: 978-1-5386-8530-3
Photovoltaic Specialists Conference (PVSC) <45, 2018, Waikoloa/Hawaii>
Photovoltaic Specialists Conference (PVSC) <45, 2018, Waikoloa/Hawaii>
Photovoltaic Science and Engineering Conference (PVSEC) <28, 2018, Waikoloa/Hawaii>
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) <34, 2018, Waikoloa/Hawaii>
European Commission EC
H2020-Industrial Leadership - COMPET - Bottom-up space technologies at low TRL; 687336; SiLaSpaCe
Si based Layer Stacks for Rear-Side Passivation and Enhanced Reflection of GaInP/GaInAs/Ge Triple-Junction Space Solar Cells
Konferenzbeitrag, Elektronische Publikation
Fraunhofer ISE ()
III-V solar cell; passivation; germanium; lifetime measurement; solar cell simulation; space solar cell; electron irradiation; Photovoltaik; III-V und Konzentrator-Photovoltaik; III-V Epitaxie und Solarzellen; solar cells; measurement; cell simulation

For future 4-junction Ge based multi-junction solar cells, the current generated in the Ge sub-cell gets very important. We developed an efficient rear-side passivation stack, which results in minority carrier lifetimes (τeff) ≈ 200 μs and investigated its performance in an accelerated aging experiment (1 MeV electron irradiation). The aging caused a strong lifetime decrease down to τeff = 4 μs, whereas the carrier mobility stayed constant. These experimental values provide the basis for Beginning-of-Life and End-of-Life solar cell simulations, which show that the potential of the rear-side passivation for 3-junction solar-cell performance is limited, but very promising for 4-junction solar cells.