Optimization of thin film silicon solar cells on highly textured substrates

Authors

  • Matthieu Despeisse,

    Corresponding author
    1. Photovoltaics and Thin Film Electronics Laboratory, Institute of Micro-engineering (IMT), Ecole Polytechnique Fédérale de Lausanne (EPFL), Rue Breguet 2, 2000 Neuchatel, Switzerland
    • Phone: +41-32-7183387; Fax: +41-32-7183201
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  • Corsin Battaglia,

    1. Photovoltaics and Thin Film Electronics Laboratory, Institute of Micro-engineering (IMT), Ecole Polytechnique Fédérale de Lausanne (EPFL), Rue Breguet 2, 2000 Neuchatel, Switzerland
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  • Mathieu Boccard,

    1. Photovoltaics and Thin Film Electronics Laboratory, Institute of Micro-engineering (IMT), Ecole Polytechnique Fédérale de Lausanne (EPFL), Rue Breguet 2, 2000 Neuchatel, Switzerland
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  • Gregory Bugnon,

    1. Photovoltaics and Thin Film Electronics Laboratory, Institute of Micro-engineering (IMT), Ecole Polytechnique Fédérale de Lausanne (EPFL), Rue Breguet 2, 2000 Neuchatel, Switzerland
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  • Mathieu Charrière,

    1. Photovoltaics and Thin Film Electronics Laboratory, Institute of Micro-engineering (IMT), Ecole Polytechnique Fédérale de Lausanne (EPFL), Rue Breguet 2, 2000 Neuchatel, Switzerland
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  • Peter Cuony,

    1. Photovoltaics and Thin Film Electronics Laboratory, Institute of Micro-engineering (IMT), Ecole Polytechnique Fédérale de Lausanne (EPFL), Rue Breguet 2, 2000 Neuchatel, Switzerland
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  • Simon Hänni,

    1. Photovoltaics and Thin Film Electronics Laboratory, Institute of Micro-engineering (IMT), Ecole Polytechnique Fédérale de Lausanne (EPFL), Rue Breguet 2, 2000 Neuchatel, Switzerland
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  • Linus Löfgren,

    1. Photovoltaics and Thin Film Electronics Laboratory, Institute of Micro-engineering (IMT), Ecole Polytechnique Fédérale de Lausanne (EPFL), Rue Breguet 2, 2000 Neuchatel, Switzerland
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  • Fanny Meillaud,

    1. Photovoltaics and Thin Film Electronics Laboratory, Institute of Micro-engineering (IMT), Ecole Polytechnique Fédérale de Lausanne (EPFL), Rue Breguet 2, 2000 Neuchatel, Switzerland
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  • Gaetano Parascandolo,

    1. Photovoltaics and Thin Film Electronics Laboratory, Institute of Micro-engineering (IMT), Ecole Polytechnique Fédérale de Lausanne (EPFL), Rue Breguet 2, 2000 Neuchatel, Switzerland
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  • Thomas Söderström,

    1. Photovoltaics and Thin Film Electronics Laboratory, Institute of Micro-engineering (IMT), Ecole Polytechnique Fédérale de Lausanne (EPFL), Rue Breguet 2, 2000 Neuchatel, Switzerland
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  • Christophe Ballif

    1. Photovoltaics and Thin Film Electronics Laboratory, Institute of Micro-engineering (IMT), Ecole Polytechnique Fédérale de Lausanne (EPFL), Rue Breguet 2, 2000 Neuchatel, Switzerland
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Abstract

Doped layers made of nanostructured silicon phases embedded in a silicon oxide matrix were implemented in thin film silicon solar cells. Their combination with optimized deposition processes for the silicon intrinsic layers is shown to allow for an increased resilience of the cell design to the substrate texture, with high electrical properties conserved on rough substrates. The presented optimizations thus permit turning the efficient light trapping provided by highly textured front electrodes into increased cell efficiencies, as reported for single junction cells and for amorphous silicon (a-Si)/microcrystalline silicon tandem cells. Initial and stabilized efficiencies of 12.7 and 11.3%, respectively, are reported for such tandem configuration implementing a 1.1 µm thick microcrystalline silicon bottom cell.

original image

SEM image after FIB cut of an amorphous silicon/microcrystalline silicon tandem cell reported with a stabilized efficiency of 11.3% for a bottom cell thickness of about 1.1 µm.

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