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Energy Efficiency Opportunities in Silicon Ingot Manufacturing

01 December 1999 | By Mark Osborne | White Papers > Edition 10, Cleanroom

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BRYAN FICKETT, GREG MIHALIK, Siemens Solar, Vancouver, WA, USA

ABSTRACT

Energy and argon are two costly components used in the Czochralski (CZ) growth of silicon ingot. Siemens Solar Industries (SSI), in cooperation with the Northwest Energy Efficiency Alliance (NEEA), are developing a method which significantly reduces consumption of these costly resources. A discrete finite element package was used to model CZ growth conditions on a Kayex CG6000 crystal growth furnace. Based on these simulations an energy efficient hotzone was designed and assembled. The modifications resulted in substantial reductions in energy and argon, as well as improvements in productivity, yield, and ingot characteristics.
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