Investigations on laser fired contacting and annealing of RST silicon PERC-type solar cells

Autor:	Albrecht, B., Botchak, Y.P., De Moro, F., Keller, P., Hahn, G.
Jazyk:	angličtina
Rok vydání:	2016
Předmět:	Silicon Solar Cells Improvements and Innovation Annealing Lifetime Passivation Ribbon Silicon Laser Fired Contacts ddc:530 Wafer-Based Silicon Solar Cells and Materials Technology
Popis:	32nd European Photovoltaic Solar Energy Conference and Exhibition; 858-862 The Ribbon on Sacrificial Template (RST) casting process is a kerf-loss free direct wafer casting method, which enables the production of silicon ribbon wafers below 100 μm thickness for thin solar cells. But the thinner the cell, backside passivation is all the more important. In our lab-type PERC solar cell process, the back contact is realized by laser fired contacts (LFC). In this study the influence of different LFC parameters on back side passivation is shown, based on lifetime samples made of standard 1 Ohmcm FZ wafers. With the best parameter set, surface recombination velocity Seff,LFC of 34.1 cm/s is possible with reasonable contacting. Beside backside passivation, an improvement of bulk lifetime of RST material was achieved by different surface passivation and annealing steps. These improvements resulted in a new effective lifetime record for RST material of 39.6 μs (measured by QSSPC).
Databáze:	OpenAIRE
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