Mask-free preparation method of copper electrode of heterojunction solar cell

Abstract

The invention discloses a mask-free preparation method of a copper electrode of a heterojunction solar cell, which comprises the following steps of: preparing a heterojunction cell substrate, depositing transparent conductive films on two surfaces of the heterojunction cell substrate, preparing a metal grid line on the P side of the heterojunction cell substrate, immersing the N side into a solution to serve as a negative electrode, and connecting P-side metal grid line with the platinum electrode to serve as a positive electrode; preparing an indium layer metal seed layer through laser assistance; preparing a metal bonding layer on the formed metal seed layer in a chemical plating manner; preparing a metal conducting layer on the formed metal bonding layer in a bipolar pulse electroplating mode. According to the invention, the preparation of the metal electrode can be realized without adopting any mask pattern, the process complexity can be obviously reduced, the seed layer is formed by a laser-assisted method, the mask removal and the corrosion process of the full-area seed layer are avoided, the interface contact resistance can be reduced, the performance of the heterojunction cell is improved, and the purposes of high efficiency and low cost are realized.

Description

technical field [0001] The invention belongs to the field of heterojunction solar cells, in particular to a maskless preparation method for copper electrodes of heterojunction solar cells. Background technique [0002] With the development of social economy, the demand for energy continues to increase, the energy crisis is intensified, and the energy consumption process has caused serious damage to the ecological environment, and the contradiction between the two has become increasingly prominent. In order to achieve sustainable development of the social economy , renewable energy and clean energy will play an increasingly important role. As an important part of renewable energy in the 21st century, under the background of global warming and energy depletion, solar energy has the characteristics of inexhaustible, wide coverage, environmental protection, safety, green and low carbon. It has been paid more and more attention to and utilized by the governments of various count...

AI Technical Summary

Problems solved by technology

However, although this method does not require the subsequent selective etching of the seed layer, it still needs to prepare a mask pattern and the subsequent etching of the mask pattern. The process is relatively complicated, which runs counter to the goal of high efficiency and low cost for heterojunction solar cells.

[0008] The most commonly used methods for preparing metal seed layers at present: physical vapor deposition (including PVD, sputtering, etc.), chemical vapor deposition, inkjet printing, printing, spraying, electroplating, electroless plating, etc., but the above-mentioned traditional methods for forming seed layers The process is more complex and consumable

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