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Texturing method for solar cell

A solar cell sheet and backside technology, applied in the field of solar energy utilization, can solve the problems of reducing reflectivity, complex process, high cost, etc., and achieve the effects of reducing recombination rate, simple process, and improving utilization efficiency

Inactive Publication Date: 2011-09-14
JETION SOLAR HLDG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, with the rapid development of the photovoltaic industry in recent years, the existing texturing process has reached the bottleneck stage. This is because: no matter whether it is a pyramid-shaped textured structure or a wormhole-shaped textured structure, it is impossible to reduce without limit Reflectivity, improve short-circuit current to achieve the purpose of improving the utilization efficiency of solar cells
To this end, some laboratories have developed reactive ion etching technology, honeycomb textured structure technology, electrochemical corrosion technology, etc. to modify the textured structure, thereby reducing the reflectivity and improving the utilization efficiency of solar cells, but the research done by the laboratory is not High cost and complicated process are required, so it is difficult to apply it to commercial production

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0032] As mentioned in the background technology section, the texturing process in the commercial production of the prior art has reached the bottleneck stage, and it is no longer possible to reduce the reflectivity of silicon wafers to improve the utilization efficiency of solar cells. Although the laboratory can use some technical means to Modify the suede structure to reduce the reflectivity, but the research done in the laboratory requires high cost and complicated process, so it is difficult to apply it to commercial production. The inventors found that in the prior art, the reflectivity is reduced by modifying the textured structure, that is, in the prior art, only the front textured structure of the solar cell is focused on, and the reflection is reduced by modifying the textured structure of the front surface. rate, increase the short-circuit current, and ultimately improve the utilization efficiency of solar cells.

[0033] Based on this, the present invention finds a...

Embodiment 2

[0045] The method for making texture of a solar battery sheet provided by the present invention is described in detail below with a specific embodiment, and the method specifically includes:

[0046] Step S1: Texturing the front side of the solar battery sheet.

[0047] Solar cells, that is, silicon wafers, are divided into monocrystalline silicon and polycrystalline silicon. In the texturing process, the texturing liquid and some process conditions used for monocrystalline silicon and polycrystalline silicon will be different. The two situations are described below.

[0048] When the solar cells are monocrystalline silicon, step S1 may further include the following steps:

[0049] Step S11: placing the front side of the solar battery sheet in the alkaline solution and the back side out of the alkaline solution.

[0050] Before this step, the single crystal silicon needs to be ultrasonically cleaned and pretreated, and then put into a texturing tank for texturing. The textur...

Embodiment 3

[0093] Provide two batches of the same P-type monocrystalline silicon samples and two batches of the same P-type polysilicon samples, the resistivity can be between 1Ω·cm~6Ω·cm, and each batch contains 10 samples. The first and second batches of samples are monocrystalline silicon, and the third and fourth batches of samples are polycrystalline silicon.

[0094] The first batch of samples is subjected to double-sided texturing according to the prior art, and the specific implementation process can be: ultrasonic cleaning and pretreatment of the first batch of samples; immersion of the first batch of samples in the alkaline solution described in Example 2 In 80°C, velvet was made for 30 minutes; after velvet making, the first batch of samples were placed in a warm water isolation tank at 45°C for the first rinsing operation; after the first rinsing operation, the first batch of samples were placed in hydrochloric acid solution Dehydration and removal of metal ions are carried o...

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Abstract

The embodiment of the invention discloses a texturing method for a solar cell. The method comprises the following steps of: texturing the front surface of the solar cell; and polishing the back surface of the solar cell. By the provided texturing method, a low-reflectivity textured surface structure is formed on the front surface of the solar cell, and a high-reflectivity polished surface structure is formed on the back surface of the solar cell; and by the high-reflectivity polished surface structure, the long wave response is increased, and a recombination rate of a back metal electrode and a silicon wafer is reduced; and the open-circuit voltage, the short-circuit current and filling factors are improved, so the utilization efficiency of the solar cell can be improved. Furthermore, the texturing method is lower in cost, and is simple, so the texturing method can be widely applied to commercial production.

Description

technical field [0001] The invention relates to the technical field of solar energy utilization, and more specifically, relates to a method for making texture of a solar battery sheet. Background technique [0002] A solar cell, also known as a photovoltaic cell, is a semiconductor device that converts the sun's light energy directly into electrical energy. Because it is a green product, does not cause environmental pollution, and is a renewable resource, solar cells are a new energy source with broad development prospects in today's energy shortage situation. [0003] At present, the manufacturing process of solar cells has been standardized, and its main steps are as follows: [0004] 1. Texturing: Through chemical reaction, the originally bright silicon wafer surface (including the front and back) forms an uneven structure to prolong the propagation path of light on its surface, thereby improving the light absorption efficiency of solar cells. [0005] 2. Diffusion junc...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/18C23F1/24C23F1/40
CPCY02P70/50
Inventor 李建飞孙林李扬王守志祝耀华
Owner JETION SOLAR HLDG
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