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Gas-lift pumps for the flow and purification of molten silicon

A melt, flow direction technique used in the field of making melts flow or pumping melts to address issues such as low angles, thermal stress dislocations or defects

Inactive Publication Date: 2015-08-19
VARIAN SEMICON EQUIP ASSOC INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Fourth, complex pulling devices may be required to obtain low angles
Thermal stress can cause dislocations or defects

Method used

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  • Gas-lift pumps for the flow and purification of molten silicon
  • Gas-lift pumps for the flow and purification of molten silicon
  • Gas-lift pumps for the flow and purification of molten silicon

Examples

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Embodiment Construction

[0028] Embodiments of the apparatus and methods herein are described in connection with solar cells. However, these embodiments can also be used to produce, for example, integrated circuits, panels, LEDs, or other substrates known to those skilled in the art. Furthermore, although the melt is described herein as silicon, the melt may contain germanium, silicon and germanium, gallium, gallium nitride, other semiconductor materials, or other materials known to those skilled in the art. Accordingly, the invention is not limited to the specific examples described below.

[0029] figure 1 is a cross-sectional side view of an embodiment of an apparatus for separating sheets from a melt. The sheet forming device 21 has a container 16 . The container 16 can be, for example, tungsten, boron nitride, aluminum nitride, molybdenum, graphite, silicon carbide or quartz. The container 16 is used to accommodate the melt 10. The melt 10 can be silicon. The sheet 13 will be formed in the mel...

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Abstract

The embodiments herein relate to a sheet production apparatus. A vessel is configured to hold a melt of a material and a cooling plate is disposed proximate the melt. This cooling plate configured to form a sheet of the material on the melt. A pump is used. In one instance, this pump includes a gas source and a conduit in fluid communication with the gas source. In another instance, this pump injects a gas into a melt. The gas can raise the melt or provide momentum to the melt.

Description

technical field [0001] The present invention relates to sheet formation from a melt, and more particularly to methods of flowing or pumping the melt. Background technique [0002] Silicon wafers or sheets are used, for example, in the integrated circuit or solar cell industries. As the demand for renewable energy increases, the demand for solar cells continues to increase. Most solar cells are made from silicon wafers, such as monocrystalline silicon wafers. Currently, the major cost of crystalline silicon solar cells is the wafers from which the solar cells are made. The efficiency of a solar cell, or the amount of electricity generated under standard lighting, is limited in part by the quality of the wafer. As the demand for solar cells increases, one goal of the solar cell industry is to reduce the cost / power ratio. Any reduction in manufacturing wafer cost without sacrificing quality will reduce the cost / power ratio and enable wider availability of this clean energy ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C30B11/00C30B29/06
CPCY10T117/1068C30B11/007C30B29/06Y10T117/1044Y10T117/1048C30B11/00C30B15/06C30B29/08C03B29/08
Inventor 彼德·L·凯勒曼菲德梨克·卡尔森
Owner VARIAN SEMICON EQUIP ASSOC INC