Silicon solar cell with hot spot laser etching ring and preparing method thereof

A technology of silicon solar cells and solar cells, applied in photovoltaic power generation, circuits, electrical components, etc., can solve the problems of rising cost of solar cells, failure of leakage current to meet standards, and no treatment methods, etc., to achieve low cost and reduced surface leakage current Small size, the effect of reducing battery production cost

Inactive Publication Date: 2009-11-11
CHINA SUNERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In industrial production, the leakage current of about 1% of batteries cannot meet the standard and become unqualified cells, which increases the cost of solar cells
Currently, there is no effective solution

Method used

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  • Silicon solar cell with hot spot laser etching ring and preparing method thereof
  • Silicon solar cell with hot spot laser etching ring and preparing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1, the preparation method of the crystalline silicon solar cell with hot spot laser engraving ring, its process steps are as follows:

[0019] 1. Find out the position and size of the hot spot on the silicon wafer surface of the crystalline silicon solar cell with the hot spot and mark around the hot spot;

[0020] 2. Freeze the battery silicon wafer;

[0021] 3. Use a laser beam to etch a circle around the hot spot to isolate the hot spot from the metal electrode junctions of other parts of the battery.

[0022] The silicon solar cell produced according to the above method has a metal electrode layer 1 and a Pn junction layer 2 on the surface, and a laser etching ring 4 is provided around the hot spot 3 on the surface, and the laser etching ring connects the hot spot and the metal of other parts of the battery. The electrode junctions are isolated. Since the laser etching ring separates the hot spot from the metal electrode, and the resistance of the Pn ju...

Embodiment 2

[0023] Embodiment 2 is basically the same as Embodiment 1, except that the battery to be processed is a thin-film solar cell, and step 2 is to apply water around the hot spot as a coolant. The depth of the laser etched ring penetrates the Pn junction, isolating the hot spot from the Pn junction in the rest of the cell.

Embodiment 3

[0024] Embodiment 3 is basically the same as Embodiment 1, except that step 2 is to apply alcohol around the hot spot as a cooling agent.

[0025] Such as figure 1 with figure 2 As shown, the silicon solar cell produced according to the above method has a metal electrode layer 1 and a Pn junction layer 2 on the surface, and a laser etching ring 4 is provided around the hot spot 3 on the surface, and the depth of the laser etching ring penetrates the Pn junction, Isolate the hot spot from the Pn junction, so the hot spot does not generate cell surface leakage current or produces minimal cell surface leakage current.

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Abstract

The invention relates to a silicon solar energy cell with hot spot laser etching ring. A metal electrode layer and a Pn joint layer are on a surface. The hot spots are on a surface of the cell. A laser etching ring is arranged in periphery of the hot spot, separating the metal electrode or penetrating the Pn joint in depth. The preparation method is: finding out position and size of the hot pot on the surface of the silicon solar cell with the hot spot and marking; coating a refrigerant on periphery of the hot spot or refrigerating the cell; etching a circle on the periphery of the hot spot by the laser beam to form the laser etching ring, separating the metal electrode or penetrating the Pn joint in depth; separating the Pn joints on other parts of the hot spot and the cell. Because the laser etching ring separates the hot spot and the metal electrode and the Pn joint, the drainage current caused by the hot spot is extremely reduced, even eliminated, which reduces a defective index in cell production and cost of production.

Description

technical field [0001] The invention relates to a silicon solar cell and a production method thereof, belonging to a treatment technology for hot spots on the surface of a silicon solar cell, in particular to a silicon solar cell with a hot spot laser etching ring and a method for treating hot spots on the surface of a silicon solar cell . Background technique [0002] Silicon solar cells (such as crystalline silicon solar cells, thin-film solar cells) are semiconductor devices that use PN junctions to convert light energy into electrical energy. The electric field is separated, and a potential difference is formed at the electrodes at both ends, and the electric energy can be output after being connected to the load. [0003] Due to raw material defects, contamination introduced in the process, excessive sintering and other problems, the Pn junction on the battery surface will be destroyed, and the electrons on the front of the battery will flow back to the substrate, form...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/042H01L31/06H01L31/18
CPCY02E10/50Y02P70/50
Inventor 宫昌萌王杰陈明赵建华王艾华
Owner CHINA SUNERGY CO LTD
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