Browsing NTNU Open by Author "Sortland, Øyvind Sunde"
Now showing items 1-9 of 9
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Assessment of feature engineering and long short-term memory for structure loss identification from process data in monocrystalline silicon growth by the Czochralski method
Sortland, Øyvind Sunde; M'hamdi, Mohammed; Jomâa, Moez (Research report, 2019)Structure loss impairs the quality of monocrystalline ingots and represents a major productivity loss for crystal growers. If structure loss could be predicted in advance it could help reduce the lost production time or ... -
Boron removal from silicon by steam and hydrogen
Sortland, Øyvind Sunde (Doctoral thesis at NTNU;2015:268, Doctoral thesis, 2015)Solar cells are among the most promising technologies for development of sustainable power generation in terms of environmental impact and resource availability, and crystalline silicon cells dominate the present market ... -
Boron Removal from Silicon Melts by H2O/H2 Gas Blowing: Mass Transfer in Gas and Melt
Sortland, Øyvind Sunde; Tangstad, Merete (Journal article; Peer reviewed, 2014)Metallurgical routes for solar grade silicon production are being developed as alternatives to chemical processes for their potential to achieve cost reductions, increased production volume, and reduced environmental and ... -
CFD Modeling of boron removal from liquid silicon with cold gases and plasma
Vadon, Mathieu; Sortland, Øyvind Sunde; Nuta, Ioana; Chatillon, Christian; Tangstad, Merete; Chichignoud, Guy; Delannoy, Yves (Journal article; Peer reviewed, 2018)The present study focuses on a specific step of the metallurgical path of purification to provide solar-grade silicon: the removal of boron through the injection of H2O(g)-H2(g)-Ar(g) (cold gas process) or of Ar-H2-O2 ... -
Investigation of pinholes in Czochralski silicon ingots in relation to structure loss
Sortland, Øyvind Sunde; Øvrelid, Eivind Johannes; M'hamdi, Mohammed; Di Sabatino Lundberg, Marisa (Journal article; Peer reviewed, 2019)In the production of monocrystalline silicon by the Czochralski process, structure loss frequently reduces yield and increases production time. Structure loss means the transition from monocrystalline to multicrystalline ... -
Passivation Threshold for the Oxidation of Liquid Silicon and Thermodynamic Non-equilibrium in the Gas Phase
Vadon, Mathieu; Sortland, Øyvind Sunde; Tangstad, Merete; Chichignoud, Guy; Delannoy, Yves (Journal article; Peer reviewed, 2018)The present study focuses on a specific step of the metallurgical path of purification to provide solar-grade silicon: the removal of boron through the injection of H2O(g)-H2(g)-Ar(g) (cold gas process). A progressive ... -
Statistical Analysis of Structure Loss in Czochralski Silicon Growth
Sortland, Øyvind Sunde; Jomâa, Moez; M'hamdi, Mohammed; Øvrelid, Eivind Johannes; Di Sabatino Lundberg, Marisa (Chapter, 2019)In Czochralski monocrystalline silicon growth, structure loss (SL) is the loss of the mono-crystalline structure. It represents a significant loss of productivity. In this work, this phenomenon is investigated by statistical ... -
Statistical analysis of structure loss in Czochralski silicon growth
Sortland, Øyvind Sunde; Jomâa, Moez; M'hamdi, Mohammed; Øvrelid, Eivind Johannes; Di Sabatino Lundberg, Marisa (Journal article; Peer reviewed, 2019)In Czochralski monocrystalline silicon growth, structure loss (SL) is the loss of the mono-crystalline structure. It represents a significant loss of productivity. In this work, this phenomenon is investigated by statistical ... -
Wet Chemical Synthesis of Materials for Intermediate Band Solar Cells
Sortland, Øyvind Sunde (Master thesis, 2011)The economical feasibility of commercial, single-junction solar cells is limited by high costs and limited efficiencies. New solar cell concepts and materials are sought to decrease the production costs and increase the ...