High Efficiency Lattice-Matched 4J Space Solar Cells on GaAs

Arto Aho, Marianna Raappana, Riku Isoaho, Timo Aho, Ville Polojärvi, Antti Tukiainen, Elina Anttola, Severi Mäkelä, Jarno Reuna, Hietalahti Arttu, Mircea Guina

Research output: Chapter in Book/Report/Conference proceedingConference contributionScientificpeer-review

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A lattice-matched four-junction solar cell on a GaAs substrate, for space applications, is demonstrated. The solar cell incorporates MBE grown GaInP, GaAs, GaInNAsSb and GaInNAsSb junctions with band-gaps of 1.9 eV, 1.4 eV, 1.2 eV and 0.9 eV, respectively. For AM0 illumination, the cell exhibited a maximum efficiency of 27%. For this performance, a high collection efficiency for the bottom cell is required. The high efficiency and current generation for the four-junction solar cell is primarily enabled by achieving a very low background doping level (~5×1014 cm-3) and high charge carrier lifetimes (2-4 ns) for the GaInNAsSb bottom junction. Achieving an efficiency of 33% is deemed possible by further reduction of reflection, shadowing and transmission losses.
Original languageEnglish
Title of host publication2019 European Space Power Conference (ESPC)
ISBN (Electronic)978-1-7281-2126-0
ISBN (Print)978-1-7281-2127-7
Publication statusPublished - Oct 2019
Publication typeA4 Article in conference proceedings
EventEuropean Space Power Conference -
Duration: 1 Jan 2000 → …


ConferenceEuropean Space Power Conference
Period1/01/00 → …

Publication forum classification

  • Publication forum level 1


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