A cleaning process before preparing black silicon by solar polycrystalline RIE
A technology of solar energy and black silicon, applied in the direction of sustainable manufacturing/processing, final product manufacturing, semiconductor/solid-state device manufacturing, etc., can solve the problems of low production capacity, low market share, poor appearance uniformity of cells, etc., and achieve improved conversion efficiency, reduced recombination in vivo, and reduced surface contamination
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[0024] Example 1
[0025] A cleaning process before solar polycrystalline RIE prepares black silicon, including the following steps:
[0026] a) Pre-cleaning: The silicon wafer is cleaned with a cleaning solution to remove organic impurities and particulate impurities. The cleaning temperature is 50°C and the cleaning time is 2 minutes. After completion, rinse with water; the cleaning solution is composed of sodium hydroxide solution, hydrogen peroxide and water It is composed of 1:1:4 by volume; the sodium hydroxide solution is a sodium hydroxide solution with a mass concentration of 35%;
[0027] b) Cleaning: The silicon wafers treated in step a) are immersed in a high-concentration alkaline solution for 3 minutes to remove the damaged layer, at a temperature of 50°C, and rinsed with water after completion; the high-concentration alkaline solution is 15% by mass Sodium hydroxide solution; the thickness of the removed damage layer is controlled to be 18-22 microns;
[0028] c) Oxida...
Example Embodiment
[0030] Example 2
[0031] A cleaning process before solar polycrystalline RIE prepares black silicon, including the following steps:
[0032] a) Pre-cleaning: The silicon wafer is cleaned with a cleaning solution to remove organic impurities and particulate impurities. The cleaning temperature is 60°C and the cleaning time is 5 minutes. After completion, rinse with water; the cleaning solution is composed of sodium hydroxide solution, hydrogen peroxide and water It is composed by volume ratio of 1:2.5:7; the sodium hydroxide solution is a sodium hydroxide solution with a mass concentration of 45%;
[0033] b) Cleaning: The silicon wafers treated in step a) are immersed in a high-concentration alkaline solution for 5 minutes to remove the damaged layer, at a temperature of 60°C, and rinsed with water after completion; the high-concentration alkaline solution is 25% by mass Sodium hydroxide solution; the thickness of the removed damage layer is controlled to be 18-22 microns;
[0034] ...
Example Embodiment
[0036] Example 3
[0037] A cleaning process before solar polycrystalline RIE prepares black silicon, including the following steps:
[0038] a) Pre-cleaning: The silicon wafer is cleaned with a cleaning solution to remove organic impurities and particulate impurities. The cleaning temperature is 50°C and the cleaning time is 2 minutes. After completion, rinse with water; the cleaning solution is composed of sodium hydroxide solution, hydrogen peroxide and water It is composed of 1:1:6 by volume; the sodium hydroxide solution is a sodium hydroxide solution with a mass concentration of 40%;
[0039] b) Cleaning: The silicon wafers treated in step a) are immersed in a high-concentration alkaline solution for 3 minutes to remove the damaged layer, at a temperature of 60°C, and rinsed with water after completion; the high-concentration alkaline solution is 20% by mass Sodium hydroxide solution; the thickness of the removed damage layer is controlled to 22 microns;
[0040] c) Oxidation l...
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