Gridline Manufacturing Process for Photovoltaic Cells

Abstract

The invention discloses a gate line manufacturing process for a photovoltaic cell. First slurry and second slurry are respectively put in a container connected with a lower nozzle and an upper nozzle, and the lower nozzle and the upper nozzle have an advancing speed of 125mm / s; the drying temperature of the electrode gate line at the front face of a battery is 140 to 160 DEG C; the first slurry is composed of an organic carrier, silver powder, glass powder, and an ohmic contact additive, and the organic carrier in the first slurry is formed by terpineol, butylcarbitol, ethyl cellulose and allowance according to a 55:30:10:5 weight ratio; the second slurry comprises, at a weight ratio, an organic carrier, silver powder, glass powder and a metal binder; the first slurry layer has a width of 40 to 80mum and a height of 5 to 10mum; and the second slurry layer has a width of 40 to 80mum and a height of 15 to 30mum. The positioning precision problem is solved, the electrode metal gate line itself has good conductive performance, and the height to width ratio of the acquired metal gate line is large.

Description

technical field [0001] The invention relates to a grid wire manufacturing process for photovoltaic cells, belonging to the technical field of solar cell preparation. Background technique [0002] A solar cell is a semiconductor device with "photovoltaic effect". The PN junction of the device generates voltage after being illuminated, that is, the process of generating electrical energy from light energy. Then, according to the above principle, the most critical thing is that there must be a connected circuit to form electrical energy into a current. to use. Therefore, it is very important to prepare electrodes on the surface of solar cells to draw current. At present, the industrialized solution is to print paste on both sides of the solar cell to make electrodes, one of which is used for the aluminum or aluminum / silver electrode on the back of the solar cell; the other is used for the light-receiving surface (front) of the solar cell Compared with the performance of solar...

AI Technical Summary

Problems solved by technology

[0003] The invention provides a grid wire manufacturing process for photovoltaic cells. This preparation process can prepare solar cell front electrodes with a high aspect ratio and solve the problem of positioning accuracy; secondly, it can meet the requirements for electrode shape and conductivity, and avoid The pressure exerted on the wafer during processing causes the wafer to shatter

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