Preparation method capable of improving efficiency of thin film solar cell

Abstract

The invention discloses a preparation method capable of improving efficiency of a thin film solar cell. The preparation method is used for a preparation process of a silicon-based thin-film cell or a COGS cell and comprises the steps of plating a first processing layer on a substrate, etching a first trench, plating a second processing layer, etching a second trench, plating a third processing layer and etching a third trench. The preparation method is characterized in that, during etching, average width a of all sections of a zone A is enabled to be greater than total average width d, average width b of all sections of a zone B is enabled to be smaller than total average width d and average width c of all sections of a zone C is enabled to be equal to total average width d. By changing the commonly used uniform etching method to a compensation and correction etching method, selectively and properly widening sub-cells on edges and slightly narrowing sub-cells with a good cell regional characteristic, under the situation that the effective opening width of the whole film layer of a cell panel is not influenced, the stabilization efficiency of a cell module is improved by more than one percent. Moreover, the preparation method has the advantages of wide application scope, no increase in manufacturing cost, simplicity, convenience, feasibility and the like.

Description

technical field [0001] The invention belongs to the technical field of thin-film solar cells, in particular to a preparation method for improving the efficiency of thin-film solar cells. Background technique [0002] As a member of solar cells, thin-film solar cells (including silicon-based thin-film solar cells and copper indium gallium selenium CIGS, CIS thin-film solar cells and other products) are due to saving raw materials, low energy consumption in the manufacturing process, low manufacturing cost, large substrate size, and convenient Large-scale production, easy to form integrated energy-saving products with buildings and other advantages have become one of the main development directions of solar cells. However, compared with monocrystalline and polycrystalline silicon cells, thin-film solar cells also have the following disadvantages: their conversion efficiency is relatively low, they need to occupy a large installation area and increase installation and maintenan...

AI Technical Summary

Problems solved by technology

[0007] The above data shows that the relative average attenuation rate of the samples at the corners is 11.5%, which is much higher than the relative average attenuation rate of the samples at the center of 8.6%, indicating that the efficiency of the "subcells" at the corners is low and the light attenuation rate is large

The reason for the above situation is that due to the equipment and technical limitations of large-scale vacuum coating equipment, the film properties in the corner area are different from those in the middle area.

Since the entire battery is connected in series, these (even individual) "sub-cells" with relatively poor performance will affect the efficiency and light degradation rate of the entire series-connected components

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