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Segment extraction method for single-crystal rod, and single-crystal rod formed by using method

A single-crystal rod and section-lifting technology, which is applied in the field of photovoltaics, can solve the problem of large reverse elongation of single crystal rods, achieve the effects of increasing the number, increasing the availability, and reducing production costs

Active Publication Date: 2016-10-05
YINGLI GRP +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The main purpose of the present invention is to provide a method for lifting single crystal rods, so as to solve the problem of large reverse elongation of single crystal rods in the prior art

Method used

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  • Segment extraction method for single-crystal rod, and single-crystal rod formed by using method
  • Segment extraction method for single-crystal rod, and single-crystal rod formed by using method
  • Segment extraction method for single-crystal rod, and single-crystal rod formed by using method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] For 8-inch N-type single crystal rods with broken edges, when the length of the broken edges of the single crystal rods is 10mm, start to lift the section; lower the position of the crucible so that the bottom of the single crystal rods is 45mm away from the liquid surface, that is, the bottom of the single crystal rods Located at position 1; in order to avoid cracks in the single crystal rod caused by too fast heat dissipation rate of the single crystal rod, the initial lifting speed of the single crystal rod should not be too fast, and the single crystal rod should be lifted up at a pulling speed of 200mm / h until The bottom end of the single crystal rod reaches position 2, that is, the bottom end of the single crystal rod enters the guide tube; the temperature inside the guide tube is low and the heat dissipation rate is fast. At this time, the single crystal is pulled at a pulling speed of 500mm / h until the bottom of the single crystal rod leaves the guide tube and en...

Embodiment 2

[0039] The 8-inch N-type single crystal ingot with broken edges was lifted, and the specific operating parameters of the lift are shown in Table 1. The inverse elongation of the obtained single crystal rod is shown in Table 2.

Embodiment 3

[0041] The 8-inch N-type single crystal ingot with broken edges was lifted, and the specific operating parameters of the lift are shown in Table 1. The inverse elongation of the obtained single crystal rod is shown in Table 2.

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Abstract

The invention provides a segment extraction method for a single-crystal rod, and a single-crystal rod formed by using the method. The segment extraction method comprises the following steps: step 1, beginning segment extraction when the fault edge of the single-crystal rod is 10 to 20 mm long; and step 2, carrying out segment extraction on the single-crystal rod. According to the method, since segment extraction begins when the fault edge of the single-crystal rod is 10 to 20 mm long, heat will not be continuously transmitted to the single-crystal rod from a liquid surface, so possibility of extra damage to an unstable single-crystal structure is small, and the reverse elongation length of the single-crystal rod is small and is 70 to 80% of the value of a diameter, much less than the reverse elongation length of single-crystal rods prepared by using conventional segment extraction methods; and thus, the slicing amount of the single-crystal rod is increased, the utilization rate of the single-crystal rod is improved, and manufacturing cost for the single-crystal rod is reduced.

Description

technical field [0001] The invention relates to the field of photovoltaics, in particular to a method for extracting single crystal rods and the single crystal rods formed by the method. Background technique [0002] Photovoltaic cells are silicon-based power generation system units. Czochralski N-type monocrystalline rod is the most important substrate for photovoltaic cells. When making N-type single crystal rods, broken edges of the single crystal and the segment after the broken edges are unavoidable. Single crystal broken edges refer to four protruding ridges on the surface of the 100-type single crystal rod. When the ridges disappear, it is called For broken edges. [0003] Single crystal edge fracture is the external conditions such as sudden temperature changes and the influence of impurities that make the crystal unable to nucleate normally, and the single crystal rod produces dislocations and defects, and then reverses, that is, the original single crystal with a...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C30B15/00C30B29/60C30B29/06
Inventor 周浩尹东坡司佳勇
Owner YINGLI GRP