Preparation method of heterojunction solar cell

Abstract

The invention belongs to the technical field of solar cells, and provides a preparation method of a heterojunction solar cell, and the method comprises the steps: forming a substrate device and forming a grid line on the surface of the substrate device, and the formation of the grid line comprises the following steps: forming a patterned mask layer on the surface of the substrate device, wherein the mask layer is provided with a plurality of openings, and the opening is used for defining the position of the grid line, the mask layer comprises a first sub-mask layer to an Nth sub-mask layer which are stacked in sequence, N is an integer greater than or equal to 2, and the exposure precision of the (k+1)th sub-mask layer is greater than the exposure precision of the kth sub-mask layer; taking the mask layer as a mask, and forming a grid line in the opening by adopting an evaporation process; and after the grid line is formed, removing the mask layer. According to the invention, the grid line is prepared through the mask and the evaporation process, and the pattern of the grid line is limited in the opening of the mask layer, so that overflow widening of the grid line in the width direction is avoided, width widening is avoided, incident light is increased, the conversion efficiency of the cell is improved, and the short-circuit current of the cell is improved.

Description

technical field [0001] The invention belongs to the technical field of solar cells, and in particular relates to a preparation method of a heterojunction solar cell. Background technique [0002] At present, the grid line technology of heterojunction solar cells is to prepare grid lines by screen-printing conductive silver paste, and the existing grid line material is resin-type low-temperature curing silver paste. Studies have shown that screen printing resin-type low-temperature curing silver paste has the following problems as metal electrodes: [0003] (1) Large expansion of line width: there is overflow and widening in the width direction of the grid line, which will cause a wide expansion of the width, which will block the incident light and cause the conversion efficiency of the battery to decrease; [0004] (2) Low aspect ratio: The aspect ratio of silver grid lines prepared by screen printing low-temperature silver paste is generally 30% at present. The aspect rat...

AI Technical Summary

Problems solved by technology

[0008]Therefore, the technical problem to be solved by the present invention is to overcome the problem that the gate lines of existing heterojunction cells have a larger spread in the width direction, and to provide a heterojunction cell A method for preparing a mass-junction solar cell, which can effectively prevent the width of the grid line from being expanded, thereby increasing the incident light, increasing the conversion efficiency of the cell, and improving the short-circuit current of the cell

Images