Bubbling and stirring type liquid-replenishing device with texturing tank

Abstract

The invention provides a bubbling and stirring type liquid-replenishing device with a texturing tank. The bubbling and stirring type liquid-replenishing device comprises a liquid-storing pot, a liquid-conveying pipe, a liquid-replenishing pump, a unidirectional valve, a flow meter and the texturing tank; a bubbling and stirring component is arranged at the bottom of the liquid-storing pot; the bubbling and stirring component consists of an electromagnetic reversing valve, a main air inlet pipe and branch air-blowing pipes; the main air inlet pipe is communicated with the branch air-blowing pipes and communicated with a pressure nitrogen source through the electromagnetic reversing valve; and air outlet holes are formed on the branch air-blowing pipes. The pressure nitrogen source feeds nitrogen into the main air inlet pipe by opening the electromagnetic reversing valve within 3 to 5 minutes before the liquid-replenishing pump replenishes liquid into the texturing tank, and the nitrogen is exhausted from the air outlet holes on the branch air-blowing pipes; as a chemical reagent in the liquid-storing pot cannot react with the nitrogen, the effect of bubbling and stirring by using the pressure nitrogen is ideal, the chemical reagent in the liquid-storing pot can be ensured to be uniformly stirred before liquid replenishment, so that consistent concentration of liquid replenishment by the liquid-replenishing pump is guaranteed, the stability of the texturing process is enhanced, and the texturing quality of silicon sheets is ensured.

Description

Technical field: [0001] The invention relates to texturing equipment in the production of solar cells, in particular to a liquid supplement device on the texturing equipment. Background technique: [0002] In the production process of solar cells, the preparation of the suede structure is an important step to increase the light absorption rate of the solar cell. The ideal suede structure helps to improve the performance of the battery. Due to the multiple reflection and refraction of incident light on the surface of the silicon wafer, the absorption of light is increased, and its reflectivity is very low, which is mainly reflected in the increase of short-circuit current. The so-called suede structure is prepared by using chemical corrosive agents such as sodium hydroxide diluent, ethylenediamine and phosphoquinol water, ethanolamine aqueous solution to sued the surface of the silicon wafer. After the treatment, the surface of the silicon wafer forms a dense pyramid-shaped squar...

AI Technical Summary

Problems solved by technology

Because the chemical reagent solution contains multiple chemicals and water, stratification will occur after standing still for a long time, thereby causing the concentration of the chemical reagent solution at the bottom of the liquid storage tank 1 to be higher than the concentration at the top, so that the supplemented in different periods The concentration of the chemical reagent solution is different, which affects the stability of the texturing process

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