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Meeting 2020 TMS Annual Meeting & Exhibition
Symposium Solar Cell Silicon
Presentation Title Molten Salt Electrolysis Production of Solar Silicon from Natural Quartzite
Author(s) Aditya Moudgal, Sarat Buasai, Alexander Joseph McMahon, Yi Jie Wu, Adam C. Powell, Uday Pal, Yu Zhong
On-Site Speaker (Planned) Aditya Moudgal
Abstract Scope Polysilicon production for photovoltaics (PV) via the dominant Siemens process is costly due to numerous unit operations, energy-intensity, and inherent safety problems. Molten salt electrolysis reduction of silica could potentially achieve similar energy use and cost to the Hall-Héroult process which produces the world’s aluminum, i.e. 90% lower energy use and 80% lower cost vs. the Siemens process. Recently a new molten salt was engineered for this purpose comprised of CaF₂-MgF₂-YF₃-CaO-SiO₂ with low volatility <0.1 μg/cm²·s, low viscosity <5 mPa·s, high ionic conductivity >4 S/cm and SiO₂ solubility >5 wt%, and inert anode compatibility – an order of magnitude better on all metrics than prior work. This presentation will describe experimental and modeling work to engineer a silicon reduction process using this molten salt. The process produces solid silicon using periodic current reversal to suppress cathodic instabilities.
Proceedings Inclusion? Planned: Supplemental Proceedings volume


Combustion Synthesis of Nanostructured Silicon
Dislocation-based Thermodynamic Models of V-pits Formation and Strain Relaxation in InGaN/GaN Epilayers on Si Substrates
First Principles Modeling of Water-induced Polymer Encapsulant Degradation in Silicon Modules
Molten Salt Electrolysis Production of Solar Silicon from Natural Quartzite
Phase Diagrams of the Si-P Binary System
Thermo-calc Determination of the Phase Diagram of Si-B Binary System
Thermodynamic Properties of Si-P Binary System
Using Thermo-calc Software to Deduce the Thermodynamic Properties of Si-B Binary System
Zr Addition for Enhanced B Removal from Si by Si-Cu Solvent Refining

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