Cleaning method for texturing of poly-silicon wafer

Abstract

The invention discloses a cleaning method for texturing of a poly-silicon wafer. The cleaning method is used for cleaning the silicon wafer after being textured and comprises the following steps of S1, texturing with an acid; S2, washing the silicon wafer after being subjected to the step S1; S3, placing the silicon wafer after being washed in a first cleaning liquid for immersion and cleaning; S4, washing the silicon wafer after being cleaned by the first cleaning liquid; S5, placing the silicon wafer after being washed in the step S4 in a second cleaning liquid for immersion and cleaning; S6, washing the silicon wafer after being cleaned by the second cleaning liquid; S7, placing the silicon wafer after being washed in the step S6 in a third cleaning liquid for immersion and cleaning; and S8, drying the silicon wafer after being cleaned by the third cleaning liquid. By the cleaning method, the reaction of an alkali and the silicon wafer during the alkali cleaning process is obviously improved, an existing texturing surface is prevented from being damaged to form texturing equipment with lower reflectivity, so that the electrical property of a battery is improved.

Description

technical field [0001] The invention relates to the technical field of solar cell panel manufacturing, and more specifically, relates to a method for cleaning polycrystalline silicon chip texture. Background technique [0002] Photovoltaic power generation is a technology that directly converts light energy into electrical energy by using the photovoltaic effect of the semiconductor interface. It is one of the main ways to use solar energy at present. Photovoltaic power generation has no risk of depletion; safe and reliable, no noise, no pollution emissions In addition, it is absolutely clean (no pollution); it is not limited by the geographical distribution of resources, and the advantages of building roofs can be used; for example, areas without electricity, and areas with complex terrain; local power generation and power supply can be generated without consuming fuel and erecting transmission lines; energy With the advantages of high quality, it has become an emerging ind...

AI Technical Summary

Problems solved by technology

Texturing is the first process for manufacturing crystalline silicon cells, also known as "surface texturing". The effective textured structure makes the incident light reflect and refract multiple times on the surface of the silicon wafer, increasing light absorption and reducing reflectivity , which helps to improve the performance of the battery. After the suede is prepared, the required suede is prepared by washing, alkali washing, water washing, pickling and other processes. However, during the alkali washing, the alkali will further corrode the silicon wafer. Since the crystal structure of polysilicon is an irregular crystal orientation, if all reactions are in the same crystal orientation, the brightness will be inconsistent with other crystal orientations. At this time, the reaction rate cannot be well controlled, resulting in a large suede surface when preparing the suede surface. and small suede case

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