Additive used for monocrystalline silicon wafer alkaline flocking and application method thereof
A single-crystal silicon wafer, alkali texturing technology, applied in chemical instruments and methods, crystal growth, post-processing details, etc. The problem of unsatisfactory fluffing liquid effect, etc., can achieve the effect of good texturing effect, eliminating inorganic substances on the surface and eliminating fingerprints on the surface.
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Embodiment 1
[0031] Example 1: (1) Prepare additives, add 15 mol ethanolamine, 10 mol sodium tripolyphosphate, 5 mol sodium dodecylbenzenesulfonate, 2 mol sodium hydroxide into 90 mol deionized water, mix evenly to prepare texturing additives. (2) Prepare an alkaline texturing liquid, and dissolve sodium hydroxide in deionized water to obtain an alkaline texturing liquid, wherein the mass percentage of sodium hydroxide is 1.5%. Add 8 L of prepared additives to 100 L of alkaline texturing liquid to obtain texturing agent. Dip monocrystalline silicon wafers for solar cells into the texturing agent for texturing. During texturing, the temperature is controlled at 80°C, and the texturing time is 17 minutes. The size of the pyramid textured surface of the obtained silicon wafers is 1-3 μm as detected by scanning electron microscopy. And the size is uniform, there is no gap between adjacent pyramids, the reflectivity is 10.0%, and the thinning amount of silicon wafer is 5.5 μm by etching on one ...
Embodiment 2
[0032] Example 2: (1) Prepare additives, add 15 mol ethanolamine, 10 mol sodium tripolyphosphate, 5 mol sodium dodecylbenzenesulfonate, 2 mol sodium hydroxide into 90 mol deionized water, mix well to prepare texturing additives. (2) Prepare an alkaline texturing liquid, and dissolve sodium hydroxide in deionized water to obtain an alkaline texturing liquid, wherein the mass percentage of sodium hydroxide is 1.5%. Add 8 L of prepared additives to 100 L of alkaline texturing liquid to obtain texturing agent. Dip monocrystalline silicon wafers for solar cells into the texturing agent for texturing. During texturing, the temperature is controlled at 75°C, and the texturing time is 15 minutes. The size of the pyramid textured surface of the obtained silicon wafers is 1-2 μm as detected by scanning electron microscopy. And the size is uniform, there is no gap between adjacent pyramids, the reflectivity is 10.9%, and the silicon wafer single-side corrosion thinning is 4.5μm.
Embodiment 3
[0033] Example 3: (1) Preparation of additives, adding 20 mol of ethanolamine, 12 mol of potassium tripolyphosphate, 8 mol of sodium dodecylbenzene sulfonate, and 3 mol of sodium hydroxide into 100 mol of deionized water, and mixing evenly to prepare a texturing additive. (2) Prepare an alkaline texturing liquid, and dissolve sodium hydroxide in deionized water to obtain an alkaline texturing liquid, wherein the mass percentage of sodium hydroxide is 1.5%. Add 10L of the prepared additive to 100L of alkaline texturing liquid to obtain the texturing agent. Dip monocrystalline silicon wafers for solar cells into the texturing agent for texturing. During texturing, the temperature is controlled at 80°C, and the texturing time is 17 minutes. The size of the pyramid textured surface of the obtained silicon wafers is 1-2 μm as detected by scanning electron microscopy. And the size is uniform, there is no gap between adjacent pyramids, the reflectivity is 11.3%, and the silicon wafer...
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