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  4. Cast-mono Silicon Wafers for a Sustainable PV Market Growth
 
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2020
Conference Paper
Title

Cast-mono Silicon Wafers for a Sustainable PV Market Growth

Abstract
The economic and ecologic sustainability of using cast-mono silicon wafers in comparison to Czochralski silicon wafers for the production of PERC solar cells and their subsequent application in a photovoltaic system has been studied within a cost and carbon footprint analysis for the whole value chain. The cast-mono growth technology has been modelled based on a G8 industrial furnace system compared to a Cz-growth systems with 36"" crucible size and recharging process. The carbon footprint and cost per wafer were evaluated for M6 and M12 wafer sizes. A PV system with cast-mono wafers shows a 9 % reduced carbon footprint for a use phase of 25 years with the assumed properties. On wafer level the cost profiles for both technologies show a cross over point at around 5-7 $ct per kilowatt hour of electricity with lower cost of cast-mono wafers in case of higher electricity prices. An increase of brick yield from actual approx. 53 % to over 60 % would result in a wafer cost decrease of up to 0,4 $ct per Watt peak thus enabling a competitiveness for the future wafer market.
Author(s)
Riepe, Stephan  
Nold, Sebastian  
Brailovsky Signoret, Peter Henri
Krenckel, Patricia  
Friedrich, Lorenz
Janz, Stefan  
Preu, Ralf  
Mainwork
37th European Photovoltaic Solar Energy Conference and Exhibition, EU PVSEC 2020  
Conference
European Photovoltaic Solar Energy Conference and Exhibition (EU PVSEC) 2020  
DOI
10.4229/EUPVSEC20202020-2AO.4.3
Language
English
Fraunhofer-Institut für Solare Energiesysteme ISE  
Keyword(s)
  • Photovoltaik

  • Silicium-Photovoltaik

  • Kristallisation

  • wafering

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