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Solar cell back electrode, solar cell and preparation method thereof

A technology for solar cells and back electrodes, applied in the field of solar cells, can solve the problems of uncontrollable deformation, increase in battery cost, uncontrollable deformation amount, etc. Effect

Inactive Publication Date: 2017-10-24
神华(北京)光伏科技研发有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the use of high-temperature resistant glass instead of ordinary soda-lime glass as the glass substrate can improve the photoelectric conversion efficiency of solar cells, the cost of the cell will also increase significantly, and it is still unable to overcome the uncontrollable deformation caused by the stress of each film layer at high temperature
In addition, since the elastic modulus of soda-lime glass decreases with the increase of temperature, lower stress at high temperature will lead to larger deformation, and the amount of deformation caused by thermal softening is uncontrollable, which will lead to In mass production, it is difficult to control the consistency of product quality, which is not conducive to the industrial application and promotion of thin-film solar cells

Method used

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  • Solar cell back electrode, solar cell and preparation method thereof
  • Solar cell back electrode, solar cell and preparation method thereof
  • Solar cell back electrode, solar cell and preparation method thereof

Examples

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preparation example Construction

[0028] The preparation method of the solar cell back electrode provided by the present invention includes forming a bottom electrode on the non-tin surface of the glass substrate, wherein the method further includes forming a support layer on the tin surface of the glass substrate.

[0029] According to the present invention, as mentioned above, the support layer can adopt various existing methods that can effectively avoid the bending deformation caused by the decrease of the elastic modulus of the glass and the residual stress of the film under the subsequent high-temperature process (that is, it can effectively avoid the irreversible occurrence of the glass substrate. deformation), preferably at least one of a molybdenum layer, a chromium layer, a gold layer, a nickel layer, a platinum layer, a silver layer, a copper layer and a silicon oxide layer, more preferably a molybdenum layer, a chromium layer and a silicon oxide layer At least one of them is particularly preferably ...

Embodiment 1

[0060] This example is used to illustrate the solar cell back electrode provided by the present invention and its preparation method.

[0061] (1) Place the soda-lime glass substrate (size 5cm×5cm×3mm) into 10% by weight hydrochloric acid and ultrasonically clean it for 20 minutes, then take out the glass substrate and rinse it with deionized water to remove residual acid, then Place the glass substrate in absolute ethanol for 20 minutes, then take out the glass substrate, rinse it with deionized water to remove the residual ethanol liquid, then place the glass substrate in ultrapure water for 20 minutes, and clean the of glass substrates with N 2 Blow dry with an air gun and set aside.

[0062] (2) Use a tin surface meter to confirm the tin surface and non-tin surface of the soda-lime glass substrate. Then put the soda-lime glass substrate into the coating frame of the back electrode magnetron sputtering coating vacuum chamber, use metal molybdenum as the target material, a...

Embodiment 2

[0069] This example is used to illustrate the solar cell back electrode provided by the present invention and its preparation method.

[0070] (1) Same as Example 1.

[0071] (2) Use a tin surface meter to confirm the tin surface and non-tin surface of the soda-lime glass substrate. Then put the soda-lime glass substrate into the coating rack of the back electrode magnetron sputtering coating vacuum chamber, use metal molybdenum as the target material, and use the non-tin surface as the coating surface to perform DC magnetron sputtering on the non-tin surface of the glass substrate Molybdenum layer is formed. Specifically, draw a background vacuum to below 4.0E-4Pa, heat the glass substrate to 100°C, stop heating after 15 minutes, pass in argon gas of 30 sccm, adjust the air pressure to 0.8Pa by controlling the position of the cold pump plate valve, and start the glow And after 10 minutes of pre-sputtering, start to coat the first high-pressure layer for 600s; then adjust th...

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Abstract

The invention relates to the field of solar cells, and discloses a solar cell back electrode, a solar cell and a preparation method thereof. The solar cell back electrode comprises a glass substrate and a bottom electrode which is attached to a non-tin surface of the glass substrate. The solar cell back electrode further comprises a support layer which is attached to a tin surface of the glass substrate. The solar cell back electrode is controllable in deformation, so that the finished product ratio in industrial mass production can be substantially improved. Meanwhile, an absorption layer can be plated on the solar cell back electrode at a high temperature, and thus the photoelectric conversion efficiency of the solar cell can be improved.

Description

technical field [0001] The invention relates to the field of solar cells, in particular to a back electrode of a solar cell, a method for preparing the back electrode of a solar cell, a solar cell, a method for preparing a solar cell, and a solar cell prepared by the method. Background technique [0002] Due to the gradual depletion of fossil energy sources, new energy sources such as solar energy and wind energy are gradually emerging. As a device that directly converts solar energy into electrical energy, solar cells have the advantages of various installation forms, safety and pollution-free, inexhaustible and inexhaustible, and have been vigorously developed in recent years. [0003] As a very important solar cell, CIGS (copper indium gallium selenide) thin film solar cell usually includes a glass substrate and a bottom electrode (molybdenum layer or chromium layer), an absorber layer, and a cadmium sulfide layer stacked on the non-tin surface of the glass substrate lay...

Claims

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Application Information

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IPC IPC(8): H01L31/0224H01L31/18H01L31/032
CPCH01L31/022441H01L31/0322H01L31/1876Y02E10/541Y02P70/50
Inventor 李新连于涛张传升宋斌斌郭凯左宁赵树利
Owner 神华(北京)光伏科技研发有限公司
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