EU PVSEC Programme Online
EU PVSEC 2020, 7 - 11 September 2020
Presentation: 2AO.4.3 Cast-Mono Silicon Wafers for a Sustainable PV Market Growth
Type: Oral
Date: Monday, 7th September 2020
13:30 - 15:00
Author(s): S. Riepe, S. Nold, P. Brailovsky, P. Krenckel, L. Friedrich, S. Janz, R. Preu
Presenter / Speaker: S. Riepe, Fraunhofer ISE, Freiburg, Germany
Event: Conference Conference
Session: 2AO.4 Silicon Materials and Defect Engineering
Type(s) of Access:  Conference Registration
Topic: 2. 1 Feedstock, Crystallisation, Wafering, Defect Engineering
Keywords: Crystallization, Cast Mono, Life Cycle Assessment (LCA), Sustainability, Photovoltaic (PV)
Summary / 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.