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Solar cell capable of reducing cutting loss and preparation method

A technology for solar cells and batteries, applied in the field of solar cells, can solve the problems of increased compound current in the edge region, loss of efficiency of small cells, and reduced open voltage, etc., and achieves the effects of excellent effect, high efficiency concentration, and improved utilization rate.

Pending Publication Date: 2021-03-12
CHANGZHOU SHICHUANG ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the final process of the finished battery sheet, in the process of laser scribing and splitting, a damaged layer is formed on the edge of the small cell after splitting, and the defect state density of the damaged layer is high, resulting in an increase in the recombination current in the edge area and a decrease in the opening voltage, which in turn leads to Efficiency Loss in Small Cells

Method used

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  • Solar cell capable of reducing cutting loss and preparation method
  • Solar cell capable of reducing cutting loss and preparation method
  • Solar cell capable of reducing cutting loss and preparation method

Examples

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Effect test

Embodiment 1

[0054] A solar cell that can reduce cutting loss. Four strip-shaped pre-cut windows are pre-set on the side of the silicon wafer with the emitter by laser scribing, and the obtained finished solar cells are divided into solar cells along the pre-cut windows Four stick battery cells. The preparation process comprises the following steps:

[0055] Take a textured p-type silicon wafer 1 with a thickness of 200um for diffusion and junction, and make an n-emitter 2 on the surface of the silicon wafer, and at the same time deposit a layer of phosphosilicate glass on the surface of the silicon wafer after diffusion;

[0056] A groove with a depth of 5um is formed on the surface of the silicon wafer 1 with the n-emitter 2 by laser scribing, and three V-shaped strip-shaped pre-cut windows 6 are arranged on the surface of the silicon wafer;

[0057] The silicon wafer 1 with the pre-cut window 6 on the surface is cleaned with NaOH solution, and the NaOH solution reacts with the PN junct...

Embodiment 2

[0061] A solar cell capable of reducing cutting losses. Four strip-shaped pre-cut windows are pre-set on the side of the silicon wafer with the emitter electrode by screen printing corrosion paste, and the obtained finished solar cells are cut along the pre-cut windows. The battery is split into four strip cells. The preparation process comprises the following steps:

[0062] Take a textured p-type silicon wafer 1 with a thickness of 180um for diffusion and junction, and make an n-emitter 2 on the surface of the silicon wafer, and deposit a layer of phosphosilicate glass on the surface of the silicon wafer after diffusion;

[0063] On the surface of the silicon wafer 1 with the n-emitter 2, a groove with a depth of 2-5 um is formed by screen printing etching paste. In this embodiment, the depth of the groove is 3 um, and three U-shaped strips are arranged on the surface of the silicon wafer. Shaped pre-cut window 6; wherein the composition of the etching slurry includes ammon...

Embodiment 3

[0068] A solar cell that can reduce cutting loss. Four strip-shaped pre-cut windows are pre-set on the surface of the original silicon wafer by laser scribing. The obtained finished solar cell is divided into four strip-shaped cells along the pre-cut window. unit. The preparation process comprises the following steps:

[0069] Take the original P-type silicon wafer with a thickness of 200um, use laser scribing to form grooves with a depth of 10um on the front of the silicon wafer, and set three V-shaped strip-shaped pre-cut windows on the surface of the silicon wafer for texturing;

[0070] Diffusion of the silicon wafer to prepare the emitter on the surface of the silicon wafer;

[0071] Polish the silicon wafer on the back, oxidize the front to form an oxide layer, plate the front passivation anti-reflection film and the back passivation film, laser groove the back, print the positive electrode and the back electrode, and sinter to make PERC solar cells;

[0072] Take the ...

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Abstract

The invention discloses a solar cell capable of reducing cutting loss and a preparation method, one side of the solar cell with an emitter is provided with a plurality of strip-shaped pre-cutting windows, and the pre-cutting windows are grooves formed on the surface of the emitter in a laser scribing or corrosive slurry printing manner. According to the battery piece structure disclosed by the invention, the PN junction at the cutting part is removed by presetting the pre-cutting window, so that the cutting loss of a finished battery during cutting is greatly reduced, the conversion efficiencyof the strip-shaped battery unit obtained after cutting is improved, and finally the output power of the module is improved; the proportion of the depth of the pre-cutting window to the thickness ofthe solar cell is small, and the mechanical performance, such as the fragment rate, of the cell piece in the subsequent process is not influenced; and the preparation method can be realized by utilizing the existing laser slicer and screen printer resources, so that the utilization rate of equipment is improved, and the cost is reduced to a certain extent.

Description

technical field [0001] The invention relates to the field of solar cells, in particular to a solar cell capable of reducing cutting loss and a preparation method. Background technique [0002] With the continuous development of the photovoltaic industry, reducing the cost of power generation has become the consistent pursuit of the photovoltaic industry. High-efficiency components are sought after by the market because they can improve conversion efficiency, thereby reducing the system footprint and system BOS cost. Half-chip or small-piece photovoltaic module technology and shingled module technology are two important directions of high-efficiency solar module technology. Among them, half-chip or small-piece photovoltaic module technology uses laser scribing equipment to divide the finished battery into two or more pieces, reducing the internal resistance loss of the module, thereby increasing the power of the module. However, in the final process of the finished battery ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/042H01L31/0224H01L31/18
CPCH01L31/022425H01L31/042H01L31/1804Y02E10/547Y02P70/50
Inventor 绪欣许佳平曹育红张胜军沈梦超顾振华
Owner CHANGZHOU SHICHUANG ENERGY CO LTD
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