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Solar cell and manufacturing method thereof

A solar cell and manufacturing method technology, applied in the field of solar cells, can solve the problems of slow update speed of paste and screen technology, and difficulty in meeting the requirements for improving conversion efficiency.

Inactive Publication Date: 2020-01-31
CSG PVTECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the increasing pursuit of improving the conversion efficiency of crystalline silicon solar cells, traditional printing methods mainly rely on the development of paste and screen technology, but the update speed of paste and screen technology has slowed down, making it difficult to meet the requirements for improving conversion efficiency.

Method used

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  • Solar cell and manufacturing method thereof
  • Solar cell and manufacturing method thereof
  • Solar cell and manufacturing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0083] The manufacturing process of the solar cell of the present embodiment is as follows:

[0084] (1) Print aluminum paste on the first surface of the coated silicon wafer and at a distance of 0.75 mm from the edge of the first surface, and the printed aluminum paste covers the surface of the silicon wafer. Then, the silicon wafer is dried in a drying oven at a drying temperature of 180° C. and a drying time of 10 s to form a back aluminum layer.

[0085] (2) Print the back silver paste on the surface of the back aluminum layer in the above step (1), and evenly distribute and cover the surface of the back aluminum layer. Then, the silicon wafer is dried in a drying oven at a drying temperature of 150° C. and a drying time of 10 s to form a back silver layer. The back silver layer has 20 sub-electrodes, which are evenly arranged in 4 rows and 5 columns.

[0086] (3) On the second surface of the silicon wafer in the above step (2) and at a distance of 0.875 mm from the edge ...

Embodiment 2

[0091] The manufacturing process of the solar cell of the present embodiment is as follows:

[0092] (1) Print aluminum paste on the first surface of the silicon wafer after coating and at a distance of 0.75 mm from the edge of the first surface, and the printed aluminum paste covers the first surface of the silicon wafer. Then, the silicon wafer is dried in a drying oven at a drying temperature of 200° C. and a drying time of 8 seconds to form a back aluminum layer.

[0093] (2) Print the back silver paste on the surface of the back aluminum layer in the above step (1), the printed silver paste pattern has 4 rows and 5 columns, and is evenly distributed on the back aluminum layer surface. Then the silicon wafer is dried in a drying oven at a drying temperature of 170° C. and a drying time of 8 s to form a back silver layer in which 20 sub-electrodes are evenly arranged in 4 rows and 5 columns.

[0094] (3) In the above step (2), print the front silver paste on the second sur...

Embodiment 3

[0099] The manufacturing process of the solar cell of the present embodiment is as follows:

[0100] (1) Print aluminum paste on the first surface of the coated silicon wafer and at a distance of 0.3 mm from the edge of the first surface, and the printed aluminum paste covers the first surface of the silicon wafer. Then, the silicon wafer is dried in a drying oven at a drying temperature of 150° C. and a drying time of 25 s to form a back aluminum layer.

[0101] (2) In the above step (1), the backside silver paste is printed on the surface of the backside aluminum layer, and the printed backside silver paste pattern has 4 rows and 5 columns, and is evenly distributed on the backside aluminum layer surface. Then, the silicon wafer is dried in a drying oven at a drying temperature of 100° C. and a drying time of 30 s to form a back silver layer.

[0102] (3) Print the front silver paste on the second surface of the silicon wafer in the above step (2) and at a distance of 0.5 m...

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Abstract

The invention relates to a solar cell and a manufacturing method thereof. The manufacturing method of the solar cell comprises the following steps that: a silicon wafer with a first surface and a second surface are provided; a back electrode is formed on the first surface, the back electrode comprises a back aluminum layer stacked on the first surface and a back silver layer stacked on the back aluminum layer; a first grid-line-shaped silver layer is formed on the second surface through printing; a second grid-line-shaped silver layer is formed on one side, far away from the second surface, ofthe first silver layer through printing, and the orthographic projection of the second silver layer on the first silver layer at least partially falls on the first silver layer; a third grid-line-shaped silver layer is formed on one side, away from the first silver layer, of the second silver layer through printing, and at least part of the orthographic projection of the third silver layer on thesecond silver layer falls on the second silver layer, and therefore, an auxiliary grid line electrode is obtained; a main grid line electrode is formed on the second surface; and the main grid line electrode partially covers the auxiliary grid line electrode. With the manufacturing method of the solar cell adopted, the conversion efficiency of the obtained solar cell can be improved.

Description

technical field [0001] The invention relates to the technical field of solar cells, in particular to a solar cell and a manufacturing method thereof. Background technique [0002] Crystalline silicon solar cell is a device that directly converts light energy into electrical energy through the photoelectric effect, and its conversion efficiency has become one of the important factors for photovoltaic power grid parity. The printing method of crystalline silicon solar cells has an important impact on its electrical properties, especially the improvement of conversion efficiency. In the increasing pursuit of improving the conversion efficiency of crystalline silicon solar cells, traditional printing methods mainly rely on the development of paste and screen technology, but the update speed of paste and screen technology has slowed down, making it difficult to meet the requirements for improving conversion efficiency. Contents of the invention [0003] Based on this, it is ne...

Claims

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Application Information

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IPC IPC(8): H01L31/0224H01L31/068H01L31/18
CPCH01L31/022433H01L31/022441H01L31/0682H01L31/1804H01L31/1864Y02E10/547Y02P70/50
Inventor 王道发梁杭伟李家兰王丹丹
Owner CSG PVTECH
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