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Solar cell capable of saving silver paste and preparation process thereof

A solar cell and silver paste technology, which is applied in the field of solar cells, can solve the problems of complex preparation process and high cost, and achieve the effects of good conductivity, high production efficiency, and reduced series resistance

Inactive Publication Date: 2014-03-05
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

[0042] Such as Figure 1 to Figure 7 As shown, a solar cell capable of saving silver paste according to the present invention includes a silicon wafer 1, an all-aluminum paste layer 2 is printed on the back of the silicon wafer 1, and an all-aluminum paste layer on the back of the silicon wafer 1 The surface of 2 is provided with a back-side silver-plated copper tape 3, the front side of the silicon wafer 1 is provided with a pattern of sub-grid lines 4, and the surface of the sub-grid lines 4 is provided with a number of bottom surfaces brushed with silver paste 5 on the front side. Copper strips 6, the front silver-plated copper strips 6 are arranged at intervals and extend outward from the side of the silicon wafer 1 and extend to the back of the adjacent silicon wafer. The front silver-plated copper strip 6 includes a front surface arranged at intervals on the front surface of the silicon wafer The main grid line 61 of the electrode and the solder ribbon 62 extending outwar...

Embodiment 2

[0053] This embodiment is basically the same as the first embodiment above, and the difference is that the specific steps of the solar cell manufacturing process are different: specifically, the thickness of the aluminum paste layer 2 in the above step (1) is 15-20 μm;

[0054] In the above step (2), the width of the back silver-plated copper strip 3 is 2 mm, the silver-plated thickness on the back silver-plated copper strip 3 is 1 μm, and its surface roughness is R6.4;

[0055] In the above step (3), the width of the secondary gate line 4 is 90 μm and the height is 15-20 μm;

[0056] In the above step (4), the thickness of the silver paste 5 is 15-20 μm, and the front side silver-plated copper strip 6 directly above the front surface of the silicon wafer 1 has a width of 600 μm and a height of 300 μm; The width of the epitaxial part is 1.2mm, the height is 200μm, the thickness of silver plating on the front silver-plated copper strip 6 is 1μm, and its surface roughness is R6.4.

[00...

Embodiment 3

[0059] This embodiment is basically the same as the previous two embodiments, and the difference lies in the preparation process:

[0060] In the above step (1), the thickness of the aluminum paste layer 2 is 20-25 μm;

[0061] In the above step (2), the width of the back silver-plated copper tape 3 is 2.5 mm, the thickness of the silver plating on it is 2 μm, and the surface roughness is R12.5;

[0062] In the above step (3), the width of the auxiliary gate line 4 is 100 μm and the height is 25-30 μm;

[0063] In the above step (4), the silver-plated copper tape 6 on the front side with the silver paste 5 brushed on the bottom surface is pressed on the front side of the silicon wafer 1 with the pattern of the sub-grid lines 4, and dried in a drying oven. The thickness of the silver paste 5 is 25-30μm, the width of the busbar 61 in the front silver-plated copper tape 6 directly above the front surface of the silicon wafer 1 is 900 μm and the height is 250 μm, and the width of the oute...

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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 specifically 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 and the incentives of governments of various countries for the new energy industry. Improving solar cell efficiency and reducing cell production costs 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 parity. [0003] At present, most of the pastes used on the front of solar cells are silver pastes, and nearly 70% of the silver pastes are precious metal silver. At the same time, the solderability of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
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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