Pichon, Pierre-Yves and Herlach, Dieter M. and Schönecker, Axel and Holland-Moritz, Dirk and Kolbe, Matthias (2013) Study of RGS (Ribbon Growth on Substrate) microstructure development. Frühjahrstagung Sektion Kondensierte Materie der DPG, 10. - 15. March 2013, Regensburg. (Unpublished)
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Abstract
Silicon wafer for solar cell applications can be produced at high speed and in one step by the RGS technique. Textured substrates at initial temperature below the melting point of silicon are moved at a constant speed under a silicon bath, providing the driving force for nucleation and crystal growth. Heat extraction is perpendicular to the wafer transport; therefore production rate is decoupled from crystallization velocity. The development of the microstructure is strongly influenced by the thermal-mechanical contact interface between the wafer and the substrate: the summits of the substrate surface texture make discrete contact points with the wafer. It was found that a better contact leads to higher growth velocity, smaller grain size and higher dislocation density. The important parameters influencing the formation of the interface were studied during casting experiments and by bringing silicon droplets in contact with the substrate. It was found that the initial temperature of the substrate is strongly influencing the formation of the thermal contact. Under certain conditions it was found that the crystallization front can form twinned dendritic crystals. This was attributed to a higher driving force for crystal growth than the driving force for nucleation on the substrate.
Item URL in elib: | https://elib.dlr.de/81741/ | ||||||||||||||||||||||||
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Document Type: | Conference or Workshop Item (Speech) | ||||||||||||||||||||||||
Title: | Study of RGS (Ribbon Growth on Substrate) microstructure development | ||||||||||||||||||||||||
Authors: |
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Date: | 14 March 2013 | ||||||||||||||||||||||||
Refereed publication: | No | ||||||||||||||||||||||||
Open Access: | No | ||||||||||||||||||||||||
Gold Open Access: | No | ||||||||||||||||||||||||
In SCOPUS: | No | ||||||||||||||||||||||||
In ISI Web of Science: | No | ||||||||||||||||||||||||
Status: | Unpublished | ||||||||||||||||||||||||
Keywords: | Undercooling of Materials | ||||||||||||||||||||||||
Event Title: | Frühjahrstagung Sektion Kondensierte Materie der DPG | ||||||||||||||||||||||||
Event Location: | Regensburg | ||||||||||||||||||||||||
Event Type: | international Conference | ||||||||||||||||||||||||
Event Dates: | 10. - 15. March 2013 | ||||||||||||||||||||||||
Organizer: | DPG | ||||||||||||||||||||||||
HGF - Research field: | Aeronautics, Space and Transport | ||||||||||||||||||||||||
HGF - Program: | Space | ||||||||||||||||||||||||
HGF - Program Themes: | Research under Space Conditions | ||||||||||||||||||||||||
DLR - Research area: | Raumfahrt | ||||||||||||||||||||||||
DLR - Program: | R FR - Research under Space Conditions | ||||||||||||||||||||||||
DLR - Research theme (Project): | R - Vorhaben Materialwissenschaftliche Forschung (old) | ||||||||||||||||||||||||
Location: | Köln-Porz | ||||||||||||||||||||||||
Institutes and Institutions: | Institute of Materials Physics in Space | ||||||||||||||||||||||||
Deposited By: | Herlach, Dieter | ||||||||||||||||||||||||
Deposited On: | 26 Mar 2013 10:29 | ||||||||||||||||||||||||
Last Modified: | 26 Mar 2013 10:29 |
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