Corrosive liquid used for monocrystal line silicon matte preparation and monocrystal line silicon matte preparation method

Abstract

The invention relates to a corrosive liquid used for monocrystal line silicon matte preparation and a use method thereof. The components of the corrosive liquid are 1-5% (mass ratio) of NaOH or KOH aqueous solution, 1-50mg / L sodium dodecyl sulfate and 0-6% (mass ratio) of sodium silicate. Monocrystal line silicon slice is immerged in the corrosive liquid when preparing the matte and corroded for 10-60 minutes at the temperature of 70-95 DEG C, and the matte is obtained. The method of the invention is simple, inexpensive and stable and is applicable to mass industrialization.

Description

technical field [0001] The invention relates to an etching solution for preparing monocrystalline silicon textured surfaces and a preparation method for monocrystalline silicon textured surfaces. Background technique [0002] Under the background of the energy crisis, renewable energy such as solar cells has been paid more and more attention by people. Solar energy is inexhaustible, and it is a clean energy with great development potential. From the appearance of solar cells in laboratories in the 1970s to the widespread use of solar cells in space and on the ground, solar cells have made great progress. Especially the monocrystalline silicon cell, because of its relatively low price, high efficiency, and its relatively simple and reliable process, has been widely valued by people in recent years. [0003] In the preparation process of monocrystalline silicon cells, the first step is surface texturing. Texturing the surface can effectively reduce the reflectivity of the b...

AI Technical Summary

Problems solved by technology

For example, Chinese patents 200810122243.7, 200510111453.2 and 200810163097.2 respectively proposed the method of adding active agent on the basis of the currently used corrosion solution (NaOH or KOH solution mixed with ethanol or isopropanol and sodium silicate), and they respectively proposed adding 0.02‰~0.1‰ of Pb(NO 3 ) 2 Or Pb, glucose and metaaluminate, although the addition of active agents can improve the suede quality, but because it also depends on alcohol-based additives (ethanol or isopropanol) to reduce surface tension and defoaming, it does not solve the problem of corrosion solution instability

And China's patent application 200810163098.7 proposes to add ultrasound on the basis of NaOH aqueous solution, and achieve the effect of eliminating air bubbles through ultrasonic vibration. This method has a significant effect in eliminating air bubbles, but it cannot reduce the surface tension of the solution, because the uniformity of the suede surface is still insufficient. Room for improvement

Chinese patent 200510029562.X, using SiC sandblasting method and acid corrosion solution corrosion method to prepare suede, high cost and not suitable for industrial production

In addition, Chinese patent 200810020206.5 uses 1.5% to 10% of sodium hydroxide or potassium hydroxide, 1 to 200 ppm of surfactant, 0.5% to 5% of sodium silicate, and 85.0% to 98.0% of deionized water to be used as a corrosion solution , also avoiding the addition of isopropanol or ethanol, but the preparation method is complicated, and it needs to be stirred in a dispersion pot for 10 to 30 minutes to completely dissolve the surfactant, then filter and discharge

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