A kind of non-network front silver paste for crystalline silicon perc solar cell and preparation method thereof

Abstract

The invention discloses a non-network junction front silver paste for crystalline silicon PERC solar cells and a preparation method thereof. The non-network front silver paste for crystalline silicon PERC solar cells is composed of the following components in weight percentage: silver powder 86-90%, glass powder 0.5-3%, organic vehicle 4-10%, additives 0.2-3%, The organic vehicle comprises the following components by weight percentage: 3-10% resin, 3-6% thixotropic agent and 84-93% solvent. In the present invention, by adopting a limited method, the obtained no-knot front conductive silver paste can be adapted to the smooth printing of a no-knot screen with a line width of 18-20 μm, which solves the problem of "the traditional screen printing screen used by the front electrode" in the background technology. The fine grid line uses the conventional netted screen with a line width of 24‑28 μm. The existence of the network knot limits the line width of the fine grid line and limits the improvement of the aspect ratio of the fine grid line, and can obtain a sintered line width of 28‑28 μm 40μm, a height of 12-18μm, and a thin grid line with an aspect ratio of 0.4-0.54, which greatly improves the current export capability of the cell and increases the photoelectric conversion efficiency.

Description

technical field [0001] The invention belongs to the technical field of solar cells, and specifically relates to a front silver paste without mesh junction for crystalline silicon PERC solar cells and a preparation method thereof. Background technique [0002] Energy is the cornerstone of economic and social development. When electricity, coal, oil and other non-renewable energy sources are frequently in emergency, energy issues have increasingly become a bottleneck restricting the development of international society and economy. Solar energy is the most abundant renewable energy available to human beings, and solar cells directly convert solar energy into electrical energy. Driven by the huge potential of the international photovoltaic market, the solar cell manufacturing industries of various countries are scrambling to invest huge amounts of money to expand production in order to gain a place. Considering the conversion efficiency and material sources, silicon-based sola...

AI Technical Summary

Problems solved by technology

[0004] The fine grid line of the screen printing screen used in the traditional front electrode uses the conventional mesh screen with a line width of 24-28 μm. The existence of the network knot limits the line width of the fine grid line and limits the improvement of the aspect ratio of the fine grid line, so it is urgent It is necessary to develop a non-network front silver paste with a narrow line width of 18-20 μm, reduce the width of the fine grid, increase the height of the fine grid, and increase the aspect ratio of the fine grid, thereby improving the current export capability of the cell and increasing the photoelectricity. Conversion efficiency