Identifying radiation damage, non-radiative losses, and efficiency potentials of perovskite based tandem PV via subcell characterization
Felix Lang a, Jarla Jarla Thiesbrummel1 b, Francisco Peña-Camargo1 a, Eike Köhnen c, Giles Eperon d, Steve Albrecht c, Samuel Stranks e, Dieter Neher a, Martin Stolterfoht a
a University of Potsdam, Institute of Physics and Astronomy, Karl-Liebknecht-Str 24-25, Potsdam, 14476, Germany
b Clarendon Laboratory, University of Oxford, Parks Road, Oxford, OX1 3PU UK
c Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Germany, Hahn-Meitner-Platz, 1, Berlin, Germany
d Swift Solar Inc., 981 Bing St., San Carlos, CA 94070, USA
e Department of Chemical Engineering & Biotechnology, University of Cambridge, Cambridge, UK
Proceedings of New Generation Photovoltaics for Space (PVSPACE)
Online, Spain, 2022 June 21st - 22nd
Organizers: Narges Yaghoobi Nia, Aldo Di Carlo, Luigi Schirone and Mahmoud Zendehdel
Contributed talk, Felix Lang, presentation 005
Publication date: 8th June 2022

Cost-efficient, lightweight perovskite-based space PV with high power-weight (W/g) values are the dream power source for private-driven space exploration, planned satellite mega-constellations, and future habitats on Moon and Mars. Application outside Earth’s protective atmosphere, however, places enormous demands on material and device stability. We recently demonstrated that perovskite single-junctions, as well as perovskite/CIGS and perovskite/perovskite tandem PV, are highly radiation tolerant, even when compared to commercially available, industry-standard III-V semiconductor on Ge triple-junction space solar cells.1–4

Nevertheless, a deep understanding of the stability and degradation mechanisms is pivotal to further optimizing the efficiency as well as the stability for space applications. However, disentangling losses and damage in monolithically interconnected tandems requires selective investigations of the individual junctions within the multi-junction stack.

To enable such selective investigations, we present various subcell-specific characterization techniques that allow us to disentangle the different losses and limiting factors in perovskite-based multijunction solar cells. In contrary to standard JV characterizations our approach allows to assess the performance and loss mechanisms of the individual subcells, even after their assembly in a monolithic tandem stack and hence deduce loss and degradation mechanisms. We will introduce our approach and show subcell pseudo-JV characteristics from thorough electroluminescence and photoluminescence measurements.5 We will begin with a detailed analysis of perovskite/silicon and perovskite/perovskite tandems, and then show examples of subcell characterizations after high energetic irradiation mimicking the harsh radiation environment in space.

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