Back contact solar cell and solar cell component

Abstract

The invention discloses a back contact solar cell, including an n type silicon substrate, a P + doped region, an N + doped region, a passivation and anti-reflection layer, a positive electrode fine grid and a negative electrode fine grid as well as a positive electrode wire and a negative electrode wire. The positive electrode wire is arranged in the positive electrode fine grid the negative electrode fine grid. The contact part between the positive electrode wire and positive electrode fine grid is provided with a conductive material. The positive electrode wire at the contact part between the positive electrode wire and the negative electrode fine grid is wrapped with an insulating material. The negative electrode wire is arranged in the positive electrode fine grid and negative electrode fine grid. The contact part between the negative electrode wire and negative electrode fine grid is provided with a conductive material. The negative electrode wire at the contact part between the negative electrode wire and the positive electrode fine grid is wrapped with an insulating material. The back contact solar cell can reduce the influence of the fine grid on resistance, reduce the use amount of silver paste, increase the filling factor, and reduce the shielding effect of the back metal on the back of the incident light.

Description

technical field [0001] The invention belongs to the field of solar cells, and in particular relates to a back-contact solar cell and a solar cell assembly. Background technique [0002] A solar cell is a semiconductor device that converts light energy into electrical energy. Lower production costs and higher energy conversion efficiency have always been the goals pursued by the solar cell industry. For conventional solar cells at present, the positive electrode contact electrode and the negative electrode contact electrode are respectively located on the front and back sides of the battery sheet. The front of the battery is the light-receiving surface, and the coverage of the metal positive electrode on the front will inevitably cause a part of the incident sunlight to be reflected by the metal electrode, resulting in a part of optical loss. The coverage area of ​​the front metal electrode of an ordinary crystalline silicon solar cell is about 7%, and reducing the front cov...

AI Technical Summary

Problems solved by technology

In the previous manufacturing process of back-contact solar cells, most of the metallization process is realized by electroplating with a relatively complicated process. Complex, the discharged waste seriously pollutes the environment, and is incompatible with the mainstream metallization method of industrial production, so it is difficult to promote low-cost industrialization

The metallization of the back contact battery using the current mainstream screen printing technology. If the conventional busbar design is adopted, the two main problems faced are 1. Between the busbar and the opposite electrode thin grid and between the busbar and the opposite electrode. Insulation between doped regions corresponding to electrodes

2. In order to reduce the line resistance on the main grid line and the thin grid line, wider grid lines are required, and more paste consumption will lead to a sharp increase in cost

Due to the printing method and the characteristics of the insulating paste that limit the thickness of the paste and the tip effect caused by the uneven surface of the silicon wafer, the insulation effect is not ideal, and breakdown will occur in a local area, resulting in reverse leakage current of the cell. increase

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