Textured mono-crystalline silicon solar battery, preparation method and preparation system thereof

Abstract

The invention provides a method for preparing an textured mono-crystalline silicon solar battery. The method comprises the following steps: preparing a protective film on one side of a mono-crystalline silicon wafer, so as to form a mono-crystalline silicon wafer provided with a single-side protective film; placing the mono-crystalline silicon wafer provided with the single-side protective film in an etching solution to carry out the etching treatment, so that the other side of the mono-crystalline silicon wafer is etched into an textured side; placing the mono-crystalline silicon wafer with one side being the textured side and the other side being the protective layer in a film-removing solution to carry out the removal treatment of the protective film, so as to form the mono-crystalline silicon wafer with one side being the textured side; forming the mono-crystalline silicon solar battery through the processes of diffusion and junction preparation by using the mono-crystalline silicon wafer with one textured side. The invention further provides a textured mono-crystalline silicon solar battery prepared by the method and a preparation system thereof. The mono-crystalline silicon solar battery with the single-side textured structure, which is prepared by the method of the invention, improves the conversion efficiency of the battery, prevents 'aluminum bubbles' from generating, and improves the utilization rate of the devices by using the existing devices in the production line.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a textured monocrystalline silicon solar cell, a preparation method and a preparation system thereof. Background technique [0002] With the decrease of traditional energy sources, people pay more and more attention to solar cells as a renewable energy source. How to improve battery efficiency and reduce battery cost has always been the goal of people's efforts. In terms of improving cell efficiency, the textured structure of silicon wafers is currently a commonly used structure in the preparation of single crystal silicon solar cells. . The typical types of monocrystalline silicon wafer textured structure are as follows: figure 1 shown. For a solar cell with a flat silicon wafer, about 33% of the sunlight incident on the surface is reflected by the surface and cannot be absorbed by the cell. For the textured structure, due to the pyramid structure on the surface, the ref...

AI Technical Summary

Problems solved by technology

Considering that the thickness of the silicon wafer itself is only 200-300 microns, the requirements for equipment control are very high, and the control of the etching liquid level is very precise. If it is too high or too low, there will be excessive etching or unetched parts, so it is necessary to invest in high cost

In addition, there are certain requirements for the working environment of the equipment, and small disturbances in the environment will also have a greater impact on the control of the liquid level.

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