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Open-circuit voltage optimisation of amorphous silicon thin film solar cells for flexible photovoltaics

: Sönderström, T.; Haug, F.-J.; Terrazzoni-Daudrix, V.; Niquille, X.; Perregaux, S.; Fahland, M.; Ballif, C.

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European Commission, Joint Research Centre -JRC-:
The compiled state-of-the-art of PV solar technology and deployment. 22nd European Photovoltaic Solar Energy Conference, EU PVSEC 2007. Proceedings of the international conference. CD-ROM : Held in Milan, Italy, 3 - 7 September 2007
München: WIP-Renewable Energies, 2007
ISBN: 3-936338-22-1
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) <22, 2007, Milano>
Conference Paper, Electronic Publication
Fraunhofer FEP ()
Biegsamkeit; Deckschicht; Kunststofffolie; Metallfolie; Schichtdicke; Halbleiter; Silicium

Amorphous silicon (a-Si:H) solar cells can be deposited in the substrate or n-i-p configuration, which allows the use of flexible substrates such as plastic sheets or metallic foils. The authors describe processes compatible with poly-ethylene-naphtalate (PEN) plastic foils and focus on a cell design that avoids Voc losses on textured substrates. They introduce an amorphous carbide n layer (n-SiC) with a high band gap and show that this layer yields high open circuit voltage (Voc) independent of the substrate micro-texture. Initial efficiencies of 9 % on glass coated with hot silver and 8.8 % on plastic substrate are achieved. Finally, the beneficial effect of the improved Voc of the a-Si:H is incorporated into micromorph tandem cells fabricated on flexible substrates. The experiments with a n-SiC layer in the a-Si:H top cells result in the fabrication of micromorph tandem cells with initial efficiency of 10.9 % on a low-cost PEN substrate, for an a-Si:H top cell thickness of 270 nm.