https://doi.org/10.1140/epjp/s13360-023-04268-8
Regular Article
Eco-friendly perovskite/CZTSSe tandem cell exceeding 28% efficiency through current matching and bandgap optimization: a numerical investigation
1
LEA, Department of Electronics, University of Batna 2, 05000, Batna, Algeria
2
ISTA, University of Larbi Ben M’hidi, Oum El Bouaghi, Algeria
3
National Institute for Applied Sciences and Technology, Tunis, Tunisia
4
Department of Electronic Engineering, Physical and Mathematical Sciences Royal Holloway, University of London, Egham, Surrey, UK
b
faycal.djeffal@univ-batna2.dz
Received:
5
May
2023
Accepted:
9
July
2023
Published online:
17
July
2023
Tandem solar cells are capable of dividing the solar spectrum over multiple sub-cells with distinct bandgaps, leading to enhanced conversion efficiencies compared to single-junction solar cells. In this paper, we investigate a new eco-friendly tandem solar cell design utilizing lead-free perovskite (LFP)/CZTSSe that can achieve very high efficiency levels is proposed and numerically investigated. The proposed design consists of a LFP-based top cell with wide bandgap of 1.8 eV, and a Cd-free CZTSSe-based bottom cell with graded bandgap profile. Numerical models based on 1-D SCAPS simulator are developed to investigate the photovoltaic performances of the proposed LFP/CZTSSe tandem solar cell. The influence of sub-cell parameters such as layers thickness, unabsorbed spectrum by top cell and GBG paradigm is investigated. The two cells have been improved, leading to an increase in the tandem efficiency and a rise in the matching current. The obtained numerical results show that the highest efficiency value of 28.4% was obtained with top and bottom cell thicknesses of 950 nm and 1 µm, respectively. Our study introduces a novel approach to improving the efficiency of tandem solar cells at an affordable cost. The proposed design methodology resolves optical and electrical losses and toxicity issues and also offers better efficiency.
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© The Author(s), under exclusive licence to Società Italiana di Fisica and Springer-Verlag GmbH Germany, part of Springer Nature 2023. Springer Nature or its licensor (e.g. a society or other partner) holds exclusive rights to this article under a publishing agreement with the author(s) or other rightsholder(s); author self-archiving of the accepted manuscript version of this article is solely governed by the terms of such publishing agreement and applicable law.
