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Solar cell capable of saving silver paste and preparation process thereof

A technology for solar cells and silver paste, applied in the field of solar cells, can solve the problems of high cost and complex preparation process, and achieve the effects of high production efficiency, good electrical conductivity, and reduction of welding equipment and personnel investment.

Inactive Publication Date: 2012-07-11
LESHAN VOCATIONAL & TECHN COLLEGE
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although these cells are highly efficient, their preparation is complex and costly

Method used

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  • Solar cell capable of saving silver paste and preparation process thereof
  • Solar cell capable of saving silver paste and preparation process thereof
  • Solar cell capable of saving silver paste and preparation process thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Such as Figure 1 to Figure 7 As shown, a solar cell that can save silver paste according to the present invention includes a silicon wafer 1, the back of the silicon wafer 1 is printed with an all-aluminum paste layer 2, and the back of the silicon wafer 1 is printed with an all-aluminum paste layer 2 is provided with a silver-plated copper strip 3 on the back, and the front of the silicon chip 1 is provided with a pattern of auxiliary grid lines 4, and the surface of the auxiliary grid lines 4 is provided with a number of silver-plated front surfaces with silver paste 5 on the bottom surface. Copper strips 6, the front silver-plated copper strips 6 are arranged at intervals and extend outward from the side of the silicon chip 1 and toward the back of the adjacent silicon chip. The main grid line 61 of the electrode and the soldering strip 62 that bends and extends outward and toward the back of the silicon chip 1, and the soldering material 62 is provided on the solde...

Embodiment 2

[0052] This embodiment is basically the same as the above-mentioned embodiment 1, the difference is that the specific steps of the solar cell preparation process are different: specifically, the thickness of the aluminum paste layer 2 in the above step (1) is 15-20 μm;

[0053] In the above step (2), the width of the silver-plated copper strip 3 on the back is 2mm, and the silver-plated thickness on the silver-plated copper strip 3 on the back is 1 μm, and its surface roughness is R6.4;

[0054] In the above step (3), the width of the auxiliary gate line 4 is 90 μm, and the height is 15-20 μm;

[0055] In the above step (4), the thickness of the silver paste 5 is 15-20 μm, and the front silver-plated copper strip 6 directly above the front of the silicon wafer 1 has a width of 600 μm and a height of 300 μm; The width of the epitaxial part is 1.2 mm, the height is 200 μm, the silver plating thickness on the front silver-plated copper strip 6 is 1 μm, and its surface roughness i...

Embodiment 3

[0058] This embodiment is basically the same as the preceding two embodiments, and the difference is that in the preparation process:

[0059] The thickness of the aluminum paste layer 2 in the above step (1) is 20-25 μm;

[0060] The width of the silver-plated copper strip 3 on the back side in the above step (2) is 2.5 mm, the silver-plated thickness on it is 2 μm, and the surface roughness is R12.5;

[0061] In the above step (3), the auxiliary gate line 4 has a width of 100 μm and a height of 25-30 μm;

[0062] The front silver-plated copper strip 6 that is brushed with silver paste 5 on the bottom surface of the above-mentioned steps (4) is pressed on the above-mentioned silicon chip 1 front with the auxiliary grid line 4 pattern, and is dried by a drying furnace. The thickness of the silver paste 5 is 25-30 μm, the width of busbar 61 in the front silver-plated copper strip 6 directly above the front surface of silicon wafer 1 is 900 μm, and the height is 250 μm, and the...

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Abstract

The invention belongs to the technical field of solar cells, and particularly discloses a solar cell capable of saving silver paste and a preparation process of the solar cell. The solar cell comprises a silicon chip, a full-aluminium paste layer is coated on the back of the silicon chip, a back silver-plated copper band is arranged on the surface of the full-aluminium paste layer on the back of the silicon chip, a pattern of auxiliary grid lines is arranged on the front of the silicon chip, a plurality of front silver-plated copper bands with bottoms coated with silver paste are arranged on the surface of the auxiliary grid lines; the front silver-plated copper bands are arranged at intervals, and are extended out from the side surface of the silicon chip towards the back of the silicon chip; the front silver-plated copper bands comprise main grid lines and an outward welding band, wherein the main grid lines are arranged on the front of the silicon chip at intervals and form a front electrode, and the welding band is bent and extends towards the back of the silicon chip and is provided with a soldering tin material welded with the silver-plated copper band at the bottom of the adjacent silicon chip. With adoption of the solar cell capable of saving silver paste and the preparation process of the solar cell, the use of silver paste can be reduced, the shading area is reduced, the efficiency of the solar cell is improved, and simultaneously, the silver-pated copper bands can be directly used as the welding band between cell plates, thereby simplifying the welding process, effectively reducing the production cost and being suitable for large-scale industrial production.

Description

technical field [0001] The invention belongs to the technical field of solar cells, and in particular relates to a solar cell capable of saving silver paste and a preparation process thereof. Background technique [0002] In recent years, the rapid development of the photovoltaic industry has benefited from the continuous improvement and progress of solar cell technology, as well as the encouragement of governments of various countries to the new energy industry. Improving the efficiency of solar cells and reducing the cost of cell production are the main directions of research on solar cell technology. In order to achieve these two directions, people continue to improve traditional processes, such as screen printing and paste processes, and try various new processes and technologies to achieve the goal of affordable Internet access. [0003] At present, most of the paste used on the front side of the solar cell is silver paste, and nearly 70% of the silver paste is preciou...

Claims

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Application Information

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IPC IPC(8): H01L31/0224H01L31/18B41M1/12
CPCY02P70/50
Inventor 王丽沈辉王晓忠刘家敬梅建滨邹禧武
Owner LESHAN VOCATIONAL & TECHN COLLEGE
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