Unlock instant, AI-driven research and patent intelligence for your innovation.

Preparation method for boron master alloy

A boron master alloy and equipment technology, which is applied in the field of photovoltaic raw material preparation, can solve the problems of boron master alloy rod influence and high cost of boron master alloy rod

Inactive Publication Date: 2017-12-29
JINKO SOLAR CO LTD +1
View PDF5 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above situation, it is necessary to provide a boron master alloy preparation method for the high cost of drawing boron master alloy rods through single crystal furnaces in the prior art, and the direct crushing of boron master alloy rods affects the debugging efficiency of silicon ingot resistivity. method

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method for boron master alloy
  • Preparation method for boron master alloy
  • Preparation method for boron master alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] see figure 1 It is the preparation method of the seed boron master alloy in the embodiment of the present invention, including steps S1-S6.

[0030] Step S11, selecting an industrial silicon raw material with the same or similar boron element concentration as the target boron master alloy, and the sum of the metal element concentrations in the industrial silicon raw material is not higher than 1000ppmw.

[0031] In this embodiment, the industrial silicon raw material with the same or similar boron concentration as the target boron master alloy rod is used, and the total concentration of the metal elements in the industrial silicon raw material is not higher than 1000 ppmw, and the cost is low. The industrial silicon raw material selected in the present invention requires impurity elements gallium, phosphorus, arsenic and other individual impurity element content3 atoms / cm 3 That's it.

[0032] The concentration of the boron element in the target boron master alloy rod...

Embodiment 2

[0055] Step S21, selecting 130kg of industrial silicon raw materials with the same or similar boron concentration as the target boron master alloy, and the sum of metal element concentrations in the industrial silicon raw materials is not higher than 1000ppmw.

[0056] Step S22, pretreat the industrial silicon raw material, wash it with mixed acid for 0.5 min, wash it with pure water, and then dry it after ultrasonic cleaning; put the pretreated industrial silicon raw material into the quartz crucible of the single crystal equipment, close the single The door of the crystal furnace is vacuumed and the leakage rate is detected. The vacuum degree in the furnace is 5pa, and the leakage rate is 3pa / 5min; turn on the heater, and increase the power every 8 minutes, gradually increasing from the initial power of 15kw to 90kw, so that the industrial silicon The temperature of the raw material reaches 1500°C and begins to melt; when the industrial silicon raw material in the quartz cruc...

Embodiment 3

[0062] Step S31, select 150kg of industrial silicon raw materials with the same or similar boron concentration as the target boron master alloy rod, and the sum of metal element concentrations in the industrial silicon raw materials is not higher than 1000ppmw.

[0063] Step S32, pretreat the industrial silicon raw material, wash it with mixed acid for 2 minutes, wash it with pure water, and then dry it after ultrasonic cleaning; put the pretreated industrial silicon raw material into the quartz crucible of the single crystal equipment, close the single crystal Vacuum the furnace door and check the leakage rate. The vacuum degree in the furnace is 8pa, and the leakage rate is 5pa / 5min; turn on the heater, increase the power every 10 minutes, and gradually increase from the initial power of 15kw to 95kw, so that the industrial silicon raw material The temperature reaches 1550°C and begins to melt; when the industrial silicon raw material in the quartz crucible melts to Φ250mm, r...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
Lengthaaaaaaaaaa
Resistivityaaaaaaaaaa
Login to View More

Abstract

The invention relates to a preparation method for a boron master alloy. The method comprises the following steps: selecting an industrial silicon raw material in the concentration the same as or similar to the concentration of boron element in a target boron master alloy bar, wherein the sum of the metal element concentration in the industrial silicon raw material is not above 1000ppmw; utilizing a czochralski method to prepare the industrial silicon raw material into a boron master alloy bar; cutting off a shouldering part and a tailing part of the boron master alloy bar, dividing the electrical resistivity of the remaining boron master alloy bar into multiple grades according to a segregation principle and cutting the boron master alloy bar into blocks according to the grade of the electrical resistivity, thereby acquiring boron master alloy blocks at multiple grades of electrical resistivity; measuring the practical electrical resistivity of the boron master alloy block at each grade of electrical resistivity; crushing the boron master alloy block at each grade of electrical resistivity into grains and separately packaging according to the grade of electrical resistivity.

Description

technical field [0001] The invention relates to the technical field of photovoltaic raw material preparation, in particular to a method for preparing a boron master alloy. Background technique [0002] With the rapid development of new energy technologies, more and more people pay attention to the research and development of photovoltaic cells. Monocrystalline silicon ingots or polycrystalline silicon ingots are important components in photovoltaic cells. P-type polysilicon and quasi (similar) monocrystalline silicon used in photovoltaic cells need to perform resistivity compensation treatment on the silicon material during ingot casting or drawing, so that the resistivity of cast polycrystalline silicon ingots and quasi (similar) monocrystalline silicon ingots is controlled at 0.5Ω·cm to 6Ω·cm is suitable for making photovoltaic cells. [0003] A master alloy is a refined, compositionally precise alloy material for casting. As the base metal of casting, it has strong gen...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
IPC IPC(8): C30B29/06C30B15/00
CPCC30B15/00C30B29/06
Inventor 彭瑶苏勇邱建峰王义斌周慧敏
Owner JINKO SOLAR CO LTD