Device and method for preparing gate electrodes of solar cell

A technology for solar cells and grid electrodes, applied in the field of solar cells, can solve the problems of low light absorption rate and low conversion efficiency of solar cells, and achieve the effect of high aspect ratio

Active Publication Date: 2013-12-18
HUAZHONG UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a device for preparing solar cell grid electrodes, the purpose of which is to improve the conversion efficienc...

Method used

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  • Device and method for preparing gate electrodes of solar cell
  • Device and method for preparing gate electrodes of solar cell
  • Device and method for preparing gate electrodes of solar cell

Examples

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preparation example Construction

[0039] figure 2 It is a schematic structural diagram of a device for preparing solar cell grid electrodes provided by an embodiment of the present invention, including: a silver paste supply device 1, a nozzle height adjustment module 2, a nozzle 3, a programmable high-voltage generator 4, an adsorption platform 5, and a motion platform 6 , solar substrate 7, control unit 8. The silver paste supply device 1 supplies silver paste to the nozzle 3 and provides the back pressure required for electrospinning. The nozzle height adjustment module 2 is used to precisely adjust the height of the nozzle 3 . The height of the nozzle 3 is defined as the distance between the printing end and the solar cell to be printed. Nozzle 3 is a direct actuator for printing grid electrodes, including a printing end, a silver paste supply interface and an electrical interface. The nozzle 3 is to be metallized for establishing an electric field. The function of the nozzle 3 is: as the positive ele...

Embodiment 1

[0071] Example 1: Now it is necessary to print an n with a side length of 125mm and a diagonal of 165mm + The upper electrode of the p-type monocrystalline silicon solar cell is made of silver paste, and its volume resistivity is 3.0uΩ.cm. According to the solar cell grid optimization theory and technological constraints, it is calculated that the spacing of the fine grid lines should be controlled at About 2.5mm, the height is controlled between 10-30um. Further, array nozzles are used to improve production efficiency.

[0072] Specific steps are as follows:

[0073] (1) The nozzle array is arranged in two rows, placed at equal intervals, each row has 25 nozzles, and the distance between the nozzles is set to 5mm, and the diameter of the nozzles is 200um, so that the theoretical thin grid line spacing printed out is 2.5mm, and the nozzles The width that can be printed is equal to the width of the battery sheet, and the printing of the fine grid can be completed in a single ...

Embodiment 2

[0079] Embodiment 2: On the basis of Embodiment 1, the height of the thin grid is controlled between 15-20um, and the parameters are reset as follows:

[0080] (1) The nozzle array is arranged in two rows, placed at equal intervals, each row has 25 nozzles, and the distance between the nozzles is set to 5mm, and the diameter of the nozzles is 300um, so that the theoretical thin grid line spacing printed out is 2.5mm, and the nozzles The width that can be printed is equal to the width of the battery sheet, and the printing of the fine grid can be completed in a single printing.

[0081] (2) Place the solar cells to be printed with grid lines on the adsorption platform and absorb them well.

[0082] (3) Add the silver paste to be printed into the cavity of the nozzle, and fill the metal nozzle. Connect the nozzle to the positive pole of the high voltage generator, and set the voltage to 1.5kV;

[0083] (4) Adjust the height of the nozzle array, and set the height to 1.5cm;

...

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Abstract

The invention provides a device and method for preparing gate electrodes of a solar cell. The device comprises a silver paste supplying device, a nozzle height adjusting module, a nozzle, a programmable-control high-voltage generator, an adsorption platform, a motion platform and a control unit. The method comprises the steps of placing a solar substrate on the adsorption platform, and preparing the first gate electrode and the second gate electrode, wherein the width of the second gate electrode is larger than that of the first gate electrode. The electric spinning direct writing process is utilized for printing the solar electrodes, an electric field is utilized for pulling silver paste in the nozzle to lines with the diameters smaller than the diameter of the nozzle, and the widths and the heights of the printed grid lines can be controlled by controlling the different voltages, the height of the nozzle and the feed speed of a substrate. The voltages affect the stability of a Taylor cone at a certain height, the height affects the heights of the printed grid lines mainly by affecting the degree of cure of the grid lines in the air, the larger the height is, the higher the printed grid lines become, the feed speed of the substrate mainly affects the widths of the printed grid lines, and the higher the speed is, the thinner the grid lines become.

Description

technical field [0001] The invention belongs to the field of solar cells, and more specifically relates to a device and method for preparing solar cell grid electrodes. Background technique [0002] A solar cell is a device that directly converts light energy into electrical energy through the photoelectric effect or photochemical effect. With the continuous progress of the photovoltaic industry, the market has put forward higher requirements for photovoltaic products. High efficiency and low cost have become important goals for the development of solar cells. One of the key steps in the production of solar cells is to fabricate very fine circuits on the front and back sides of the silicon wafers to direct the photo-generated electrons out of the cell. At the same time, in order to obtain a high-efficiency solar cell, the shading area of ​​the grid line must be reduced, and at the same time, it must have an efficient charge collection capability, so the preparation of the ...

Claims

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Application Information

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IPC IPC(8): H01L31/18B41J2/01
CPCY02P70/50
Inventor 黄永安尹周平汤朋朋潘艳桥吴林松熊有伦
Owner HUAZHONG UNIV OF SCI & TECH
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