Control method for controlling suede dimension of monocrystalline silicon heterojunction solar battery cell

Abstract

The invention discloses a control method for controlling the suede dimension of a monocrystalline silicon heterojunction solar battery cell. The method comprises the steps of conducting the damage layer removing treatment on the surface of a silicon wafer by using a strong alkaline solution; cleaning the silicon wafer by using a mixed solution of ammonia water and hydrogen peroxide; texturing by using a mixed solution of KOH / NaOH and a texturing additive so as to form pyramids on the surface of the silicon wafer, wherein the dimension of the pyramids is controlled through controlling the concentration of KOH / NaOH and the texturing time, and the concentration of KOH / NaOH and the texturing time are in directly proportional relationship with the dimension of the pyramid; cleaning the textured silicon wafer by using a mixed solution of hydrochloric acid and hydrogen peroxide; subjecting the textured silicon wafer to dehydration treatment by using a hydrofluoric acid solution, slowly pulling out the silicon wafer and drying the silicon wafer. According to the technical scheme of the invention, through controlling the concentration of KOH / NaOH, the texturing time and the texturing temperature, the range of the suede dimension can be controlled. In this way, the dimension of texturing pyramids on the silicon wafer is controlled within a certain range. Therefore, the suede uniformity of the silicon wafer is improved.

Description

technical field [0001] The invention relates to the field of crystalline silicon solar cells, in particular to a method for controlling the texture size of a monocrystalline silicon heterojunction solar cell. Background technique [0002] Silicon-based heterojunction solar cells are one of the most widely studied high-efficiency solar cell technologies. This type of cell uses n-type crystalline silicon with a high minority carrier life as the substrate for making cells, and its minority carrier life requires >1000us , the PN junction, that is, the emitter is composed of a p-type amorphous silicon film with a bandwidth of about 1.7eV and an n-type single crystal silicon surface with a bandwidth of 1.12eV, forming a heterojunction due to the difference in bandwidth. This type of cell has the characteristics of symmetrical structure, low process temperature, high conversion efficiency, and good temperature characteristics. It is one of the high-efficiency solar cell technolo...

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Problems solved by technology

[0005] In view of the above problems, the present invention provides a method for controlling the size of the textured surface of a monocrystalline silicon heterojunction solar cell, which can control the size of the textured pyramid of the silicon wafer, improve the uniformity of the textured surface of the silicon wafer, and solve the shortcomings of the prior art. The control of the size difference of the pyramids, the problem of large differences in the size of the pyramids in the texturing process

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