Solar cell piece and preparation method thereof and solar cell module

Abstract

The invention provides a solar cell piece and a preparation method thereof and a solar cell module, wherein the solar cell piece is provided with metal grid lines which are low in electrical resistivity in a transparent conducting layer, so that the collection capacity of the transparent conducting layer on carriers can be greatly improved, the resistance of the transparent conducting layer is lowered, and the current loss during working of the solar cell is lowered; the thickness of the transparent conducting layer can be reduced by arranging the metal grid lines, so that the light transmittance is improved, and the photoelectric conversion efficiency of the solar cell is improved; meanwhile, the width of a sub battery can be properly increased, so that the number of scribed lines is reduced, and the dead zone area is reduced; in addition, compared with a continuous metal film layer, the light transmission area on the metal grid lines can further improve the light transmittance; the metal grid lines are covered with a first transparent thin film layer, so that the appearance consistency of the solar cell pieces can be improved; and the first transparent thin film layer can also protect the metal grid lines from being oxidized, so that the reliability of the solar cell is improved.

Description

technical field [0001] The invention relates to the technical field of solar energy, in particular to a solar battery sheet, a preparation method thereof, and a solar battery module. Background technique [0002] Thin-film solar cells have the advantages of strong light absorption, low manufacturing cost, flexibility, stable power generation, and environmental friendliness. They are one of the most likely materials to replace silicon cells in the future. A typical thin-film battery has the following structure: a substrate, a bottom electrode, an absorber layer, a buffer layer, a window layer or a high-resistance layer, and a transparent conductive layer are sequentially stacked to form a PN junction structure to realize solar power generation. In the process of plating each functional film layer, different scribing processes are used to form different sub-cells, and the series or parallel connection between the sub-cells is realized. [0003] For thin-film solar cell compon...

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Problems solved by technology

[0003] For thin-film solar cell components, photogenerated carriers need to travel a long distance in the transparent conductive layer after passing through the PN junction. However, the existing materials of the transparent conductive layer such as AZO have poor conductivity, so it will produce a relatively long distance. Large series resistance, resulting in large carrier transport losses

In order to reduce the resistance of the transparent conductive layer in the prior art, on the one hand, since the resistance is inversely proportional to the cross-sectional area of ​​the carrier transport, the resistance can be reduced by increasing the thickness of the film such as AZO, but the thickened film is transparent On the other hand, since the resistance is proportional to the distance of carrier transmission, reducing the width of the sub-cell through the scribing process can also reduce the series resistance, but the width of the sub-cell is reduced, which means The number of scribed lines increases, resulting in a larger dead zone area

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