Preparation method for front electrode of solar cell

Abstract

The invention discloses a preparation method for a front electrode of a solar cell, and namely an electroplating method is adopted to manufacture the front electrode. The preparation method comprises two modes: the first mode is that an ink-jet printing method is first adopted to print a layer of silver electrode in a gate line area, and then the electroplating method is adopted to continue to sediment a layer of silver on the layer of silver electrode, thereby causing the front electrode to rise; and the other mode is that lasers are adopted to open a front electrode contact window, and then the electroplating method is adopted to electroplate the front electrode on the contact window. The preparation method causes the width of the front gate line electrode to be reduced and the height thereof to be increased, thereby causing series resistance of the cell to be decreased and a sunlight area to be enlarged, and helping improve the performance of the solar cell.

Description

technical field [0001] The invention relates to the field of photovoltaic utilization of solar energy, in particular to a method for preparing a front electrode of a crystalline silicon solar cell. Background technique [0002] The current production process of commercial solar cells is as follows: figure 1 Shown: Remove the damaged layer on the surface of the silicon wafer, make the textured surface → in POCl 3 Diffusion of P in the atmosphere to form n + Diffusion layer → use PECVD process to coat SiNx anti-reflection film on the front → screen print front and back electrodes, back electric field → sinter in a sintering furnace to form an ohmic contact. This commercial solar cell manufacturing technology is relatively simple, low in cost, suitable for industrialized and automated production, and thus widely used. [0003] At present, the fine grid electrode of the front electrode prepared by screen printing has a height of 5-30 microns and a width of 60-180 microns. The...

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Problems solved by technology

[0003] At present, the fine grid electrode of the front electrode prepared by screen printing has a height of 5-30 microns and a width of 60-180 microns. The wider front grid line width blocks more sunlight, making the solar cell The light utilization efficiency is not very good, and the grid line width needs to be further narrowed. It is difficult for the traditional screen printing process to reduce the fine grid width to a lower level.

The shorter thin grid increases the series resistance of the solar cell, a larger part of the current will be consumed in the form of heat, and the final collected current becomes smaller

It is also difficult to increase the height of the fine grid to a higher level in the traditional process

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