Additive for silicon wafer alkali liquor texturing
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A technology of additives and lye, applied in the field of photovoltaic texturing technology, can solve the problem that it is difficult to obtain suede
Pending Publication Date: 2021-06-01
武汉宜田科技发展有限公司
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Problems solved by technology
Polycrystalline isotropic, it is difficult to obtain suede by alkali corrosion alone
Method used
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Embodiment 1
[0034] Monocrystalline lye texturing additive:
[0035] Buffer component: 6.5%
[0036] Dispersion component; 1.5%
[0037] Suede conditioning component A: 4%
[0038] Suede conditioning component B: 0.5%
[0039] Distilled water: 87.5%.
[0040] The process steps are as follows:
[0041] 1. Dissolve 120g of potassium hydroxide in 3880g of deionized water to prepare a potassium hydroxide solution with a mass fraction of 3%.
[0042] 2. In the potassium hydroxide solution in step 1, add 0.35% of the texturing additive of embodiment 1 by weight.
[0043] 3. Soak the monocrystalline silicon wafer for solar cells in the solution in step 2, control the texturing temperature at 80-85°C, and the texturing time for 540s.
[0044] The reflectance after texturing was 10.17%. Table 1 shows the test data of the polycrystalline silicon wafer obtained by using the present invention in Example 1, wherein the cell conversion efficiency is 21.37.
[0045] Table 1
[0046] Isc ...
Embodiment 2
[0048] Polycrystalline lye texturing additive:
[0049] Buffer component: 8%
[0050] Dispersion component; 2.5%
[0051] Suede conditioning component A: 2.5%
[0052] Suede conditioning component B: 0.08%
[0053] Distilled water: 86.92%.
[0054] The process steps are as follows:
[0055] 1. Dissolve 280g of potassium hydroxide in 3720g of deionized water to prepare a potassium hydroxide solution with a mass fraction of 7%.
[0056] 2. In the potassium hydroxide solution in step 1, add 0.3% the texturing additive of embodiment 1.
[0057] 3. Soak the monocrystalline silicon wafer for solar cells in the solution in step 2, control the texturing temperature at 75-80°C, and rough texturing time for 260s.
[0058] 4. The rough textured silicon wafer obtained in step 3 is obtained by the black silicon texturing process (silvering-opening-removing silver-reaming) to obtain a polycrystalline textured silicon wafer.
[0059] The reflectance after texturing was 20.47%. Table 2...
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Abstract
The invention provides an additive for silicon wafer alkali liquor texturing, and belongs to the technical field of photovoltaics. The mass percent of each component is as follows: 0.5%-15% of a buffer component, 0.5%-10% of a dispersing component, 0.1%-8% of a suede adjusting component A, 0.01%-5% of a suede adjusting component B and the balance of water. The obtained texturing additive can be applied to diamond wire cutting single crystal alkali liquor texturing and can also be applied to diamond wire polycrystal alkali liquor rough texturing. Compared with traditional alcohol added components, the additive has the advantages of no toxicity, no volatilization, uniform reaction rate, no piebaldness and excellent foam control effect. The staying and separating time of bubbles on the surface of the silicon wafer can be controlled by adjusting the proportion of the suede adjusting components A and B, and the alkali suede making effect is enhanced. After the single crystal is applied, the silicon wafer has high photoelectric conversion rate. After the polycrystal is applied, the conversion efficiency can be improved by combining the existing black silicic acid texturing technology.
Description
technical field [0001] The invention relates to an additive for texturing of silicon wafers with alkaline solution, which belongs to the field of photovoltaic technology, in particular to the field of photovoltaic texturing technology. Background technique [0002] The rapid economic growth of countries around the world and the increasing demand for energy have led to a rapid shortage of non-renewable resources such as oil, natural gas, and coal mines. Environmental pollution and energy shortages have become serious constraints on social development. Solar energy resource is a kind of real green and environment-friendly energy, because of its inexhaustible supply and inexhaustible use, it has become an urgent need of human society. An important way to apply solar energy to life is photovoltaic power generation, and silicon wafers are the most important raw materials for the photovoltaic power generation industry. By increasing the light absorption on the surface of the sili...
Claims
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