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Home  >  Journal list  >  MATERIALS TRANSACTIONS  >  Vol.50  No.8 (2009)  >  pp.1978-1984

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A Thermochemical Database for the Solar Cell Silicon Materials

Kai Tang1), Eivind J. Øvrelid1), Gabriella Tranell2) and Merete Tangstad2)
1) SINTEF Materials and Chemistry
2) Norwegian University of Science and Technology

The fabrication of solar cell grade silicon (SOG-Si) feedstock involves processes that require direct contact between solid and liquid phases at near equilibrium conditions. Knowledge of the phase diagram and thermochemical properties of the Si-based system is therefore important for providing boundary conditions in the analysis of processes. A self-consistent thermodynamic description of the Si-Ag-Al-As-Au-B-Bi-C-Ca-Co-Cr-Cu-Fe-Ga-Ge-In-Li-Mg-Mn-Mo-N-Na-Ni-O-P-Pb-S-Sb-Sn-Te-Ti-V-W-Zn-Zr system has recently been developed by SINTEF Materials and Chemistry. The assessed database has been designed for use within the composition space associated with SoG-Si materials. The thermochemical database has further been extended to calculate the surface tensions of liquid Si-based melts. In addition to thermochemical and phase equilibrium calculation, several surface-related properties (temperature and composition gradients, surface excess quantity etc.) are able to simulate simultaneously using the database. The databases can be regarded as the state-of-art equilibrium relations in the Si-based multicomponent system.

thermochemical database, solar cell grade silicon, surface properties

Received: March 30, 2009
Accepted: May 18, 2009 , Published online: July 25, 2009
Copyright (c) 2009 The Japan Institute of Metals



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