Microscopic origins of performance losses in highly efficient Cu(In,Ga)Se 2 thin-film solar cells.

Autor: Krause M; Helmholtz-Zentrum Berlin, Hahn-Meitner-Platz 1, 14109, Berlin, Germany., Nikolaeva A; Helmholtz-Zentrum Berlin, Hahn-Meitner-Platz 1, 14109, Berlin, Germany., Maiberg M; Institute of Physics, Martin-Luther University Halle-Wittenberg, Von-Danckelmann-Platz 3, 06120, Halle, Germany., Jackson P; Zentrum für Sonnenenergie- und Wasserstoff-Forschung Baden-Württemberg (ZSW), Meitnerstr. 1, 70563, Stuttgart, Germany., Hariskos D; Zentrum für Sonnenenergie- und Wasserstoff-Forschung Baden-Württemberg (ZSW), Meitnerstr. 1, 70563, Stuttgart, Germany., Witte W; Zentrum für Sonnenenergie- und Wasserstoff-Forschung Baden-Württemberg (ZSW), Meitnerstr. 1, 70563, Stuttgart, Germany., Márquez JA; Helmholtz-Zentrum Berlin, Hahn-Meitner-Platz 1, 14109, Berlin, Germany., Levcenko S; Helmholtz-Zentrum Berlin, Hahn-Meitner-Platz 1, 14109, Berlin, Germany., Unold T; Helmholtz-Zentrum Berlin, Hahn-Meitner-Platz 1, 14109, Berlin, Germany., Scheer R; Institute of Physics, Martin-Luther University Halle-Wittenberg, Von-Danckelmann-Platz 3, 06120, Halle, Germany., Abou-Ras D; Helmholtz-Zentrum Berlin, Hahn-Meitner-Platz 1, 14109, Berlin, Germany. daniel.abou-ras@helmholtz-berlin.de.
Jazyk: angličtina
Zdroj: Nature communications [Nat Commun] 2020 Aug 21; Vol. 11 (1), pp. 4189. Date of Electronic Publication: 2020 Aug 21.
DOI: 10.1038/s41467-020-17507-8
Abstrakt: Thin-film solar cells based on polycrystalline absorbers have reached very high conversion efficiencies of up to 23-25%. In order to elucidate the limiting factors that need to be overcome for even higher efficiency levels, it is essential to investigate microscopic origins of loss mechanisms in these devices. In the present work, a high efficiency (21% without anti-reflection coating) copper indium gallium diselenide (CIGSe) solar cell is characterized by means of a correlative microscopy approach and corroborated by means of photoluminescence spectroscopy. The values obtained by the experimental characterization are used as input parameters for two-dimensional device simulations, for which a real microstructure was used. It can be shown that electrostatic potential and lifetime fluctuations exhibit no substantial impact on the device performance. In contrast, nonradiative recombination at random grain boundaries can be identified as a significant loss mechanism for CIGSe solar cells, even for devices at a very high performance level.
Databáze: MEDLINE
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