Corrosion method for germanium substrate sheet of solar battery

A technology for solar cells and negatives, applied in circuits, electrical components, climate sustainability, etc., can solve the problems of easily broken pieces and low strength of germanium sheets, and achieve the effects of short operation time, reliable quality and enhanced strength

Inactive Publication Date: 2013-08-07
中锗科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The germanium substrate used for solar cells needs to be ground or back-thinned before cleaning and chemical mechanical polishing to remove the saw pattern on the surface of the germanium sheet or defects left by other previous processes, so that the processed germanium sheet is often stronger. low, easily broken

Method used

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  • Corrosion method for germanium substrate sheet of solar battery

Examples

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Comparison scheme
Effect test

Embodiment 1

[0024] Embodiment 1: take the example of corroding 4 inches of germanium sheet, its etching method comprises the following steps:

[0025] (1) Measure 1200:ml of pure water and pour it into the corrosion tank, then measure 140ml of hydrofluoric acid with a mass concentration of 48% and pour it into the corrosion tank to form No. 1 corrosion liquid;

[0026] (2) Insert the ground germanium slices into the plug in parallel order (such as figure 1 As shown in ), place 10 pieces for each plug, rinse with pure water, immerse the plug horizontally in No. Plug, after corroding the germanium sheet for 7 seconds, take it out;

[0027] (3) Quickly put the removed jam into the pure water tank and push it back and forth for cleaning, then rinse it with pure water, take out one of the germanium sheets to measure its thickness, and check whether the corrosion loss requirement is met, and the corrosion loss is required to be 3 ~5μm; the service life of No. 1 corrosion solution is guarantee...

Embodiment 2

[0032] Embodiment 2: take the example of corroding 6 inches of germanium sheet, its etching method comprises the following steps:

[0033] (1) Measure 1250:ml of pure water and pour it into the corrosion tank, then measure 146ml of hydrofluoric acid with a mass concentration of 49% and pour it into the corrosion tank to form No. 1 corrosion liquid;

[0034] (2) Insert the ground germanium slices into the plug in parallel order (such as figure 1 As shown), place 15 pieces of each plug, rinse with pure water, immerse the plug horizontally in No. 1 corrosion solution to ensure that the germanium sheet is completely submerged, and shake the plug back and forth in a direction parallel to the surface of the germanium sheet , after corroding the germanium sheet for 8 seconds, take it out;

[0035] (3) Quickly put the removed jam into the pure water tank and push it back and forth for cleaning, then rinse it with pure water, take out one of the germanium sheets to measure its thickne...

Embodiment 3

[0040]Embodiment 3: take the example of corroding 8 inches of germanium sheet, its etching method comprises the following steps:

[0041] (1) Measure 1300:ml of pure water and pour it into the corrosion tank, then measure 150ml of hydrofluoric acid with a mass concentration of 50% and pour it into the corrosion tank to form No. 1 corrosion solution;

[0042] (2) Insert the ground germanium slices into the plug in parallel order (such as figure 1 As shown), place 20 pieces of each plug, rinse with pure water, immerse the plug horizontally in No. 1 corrosion solution to ensure that the germanium sheet is completely submerged, and shake the plug back and forth in a direction parallel to the surface of the germanium sheet , after corroding the germanium sheet for 10 seconds, take it out;

[0043] (3) Quickly put the removed jam into the pure water tank and push it back and forth for cleaning, then rinse it with pure water, take out one of the germanium sheets to measure its thick...

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Abstract

The invention discloses a corrosion method for germanium substrate sheet of solar battery, comprising the following steps of: preparing No.1 corrosion liquid medicine by 1200-1300ml of pure water and 140-150ml of hydrofluoric acid with mass concentration of 48-50%, orderly placing the germanium sheet in a clamping plug, showering the clamping plug with the pure water and then dipping the clamping plug into the No.1 corrosion liquid medicine, shaking the clamping plug, after corroding the germanium sheet for 7-10 seconds, taking out the germanium sheet, quickly placing the germanium sheet into a pure water tank for washing, and showering the germanium sheet with the pure water; preparing a No.2 corrosion liquid medicine by 150-160ml of glacial acetic acid with mass concentration of not less than 99.7%, 3-5ml of bromine water with mass concentration of 99.5% and 250-260ml of hydrogen nitrate with mass concentration of 98%; dipping the clamping plug with the germanium sheet into the No.2 corrosion liquid medicine, shaking the clamping plug, taking out the germanium sheet after corroding for 20-30 seconds, placing the germanium sheet into the pure water tank for washing, showering the germanium sheet with the pure water, and finally, placing the clamping plug and the germanium sheet into a flowing water tank. By corrosion according to the method provided by the invention, the strength of the germanium sheet is enhanced, the strength is more than 18bf, and the breakage rate of the germanium sheet is greatly reduced.

Description

technical field [0001] The invention relates to a germanium substrate sheet of a solar cell, in particular to an etching process for a solar germanium substrate sheet. Background technique [0002] my country is currently the world's largest producer and exporter of germanium, but the overall technical level of the germanium industry is not high, causing serious waste of resources, and the germanium substrate materials currently used in my country are almost imported. For space solar cells, the thickness requirements, electrical properties and mechanical properties of solar germanium substrates will become higher and higher in the future. As an indispensable process for the processing of germanium single crystal materials, chemical corrosion plays an important role in the quality of germanium products. In the future, the thickness of the germanium sheet can even reach about 120 μm. If such a thin germanium sheet wants to achieve high strength and reduce the problem of high d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C23F1/24H01L31/18
CPCY02P70/50
Inventor 王卿泳孙小华郭德文赵双艳
Owner 中锗科技有限公司
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