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Front electrode and preparation method thereof

A front electrode and silver electrode technology, applied in the field of electrodes, can solve the problems that silicon solar cells cannot be promoted vigorously, the aspect ratio of thin grid lines is small, and the loss of large front electrodes, etc., to achieve reduced shading loss, small shading loss, and low contact The effect of resistance

Pending Publication Date: 2021-06-25
JIANGSU RIYU PHOTOVOTTAIC NEW MATERIAL TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0002] Most of the front electrodes of traditional crystalline silicon solar cells are made by traditional screen printing. The screen printing fine grid lines have a small aspect ratio, resulting in relatively large front electrode losses, including shading loss, resistive loss, composite loss, etc.
Moreover, the cost of silver electrodes used in current silicon solar cells accounts for 15% of the manufacturing cost of the entire silicon solar cells.

Method used

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  • Front electrode and preparation method thereof
  • Front electrode and preparation method thereof

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preparation example Construction

[0024] The second aspect of the present invention provides a method for preparing the front electrode, the method comprising:

[0025] (1) Print a trapezoidal silver electrode on the front surface of the silicon substrate that has been processed through texturing, diffusion, post-cleaning, coating and printing the back electrode process (it can be understood that the trapezoidal silver electrode is the same as the aforementioned first The dimensions of the trapezoidal silver electrodes in the middle and lower layers are exactly the same);

[0026] (2) carrying out the first metallization treatment to the silver electrode printed on the front surface of the silicon substrate;

[0027] (3) Triangular copper electrodes are printed on the surface of the silver electrodes after metallization (it can be understood that the triangular copper electrodes are exactly the same size as the upper small triangular copper electrodes in the aforementioned first aspect), forming electrode sta...

Embodiment approach

[0036] According to a preferred embodiment of the present invention, the preparation method of the front electrode comprises:

[0037] (1) Print a trapezoidal silver electrode on the front surface of the silicon substrate after the process of texturing, diffusion, post-cleaning, coating and printing the back electrode;

[0038] (2) carrying out the first metallization treatment to the silver electrode printed on the front surface of the silicon substrate;

[0039] (3) Print triangular copper electrodes on the surface of the silver electrodes after metallization to form electrode stacks;

[0040] (4) Performing a second metallization treatment on the copper electrode to form a front electrode of copper-silver alloy.

[0041] The present invention will be described in detail below by way of examples.

Embodiment 1

[0043] (1) Print a trapezoidal silver electrode on the front surface of the silicon substrate after the process of texturing, diffusion, post-cleaning, coating and printing the back electrode;

[0044] (2) carrying out the first metallization treatment to the silver electrode printed on the front surface of the silicon substrate;

[0045] (3) Print triangular copper electrodes on the surface of the silver electrodes after metallization to form electrode stacks;

[0046] (4) Performing a second metallization treatment on the copper electrode to form a front electrode of copper-silver alloy.

[0047] The above mentioned parameters are listed in Table 1. Test its photoelectric conversion rate according to the test method of Example 1 in CN103021510B, as shown in Table 2.

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Abstract

The invention relates to the technical field of electrodes, in particular to a front electrode and a preparation method thereof. The front electrode comprises strip-shaped composite silver electrodes evenly distributed on the front face of a silicon substrate at equal intervals, wherein the cross section of each composite silver electrode is in a triangle shape, the angles of the two base angles of each triangle are 45-80 degrees, the maximum width of the composite silver electrode is 15-60 [mu]inches, the composite silver electrode is of a composite structure of an upper layer and a lower layer, the lower layer is a silver electrode, the upper layer is a copper electrode, and the height ratio of the upper layer to the lower layer is (2-5):1. The front electrode is low in silver consumption, large in height-width ratio, small in shading loss and low in contact resistance, so that the photoelectric conversion rate of the solar cell is high.

Description

technical field [0001] The invention relates to the technical field of electrodes, in particular to a front electrode and a preparation method thereof. Background technique [0002] Most of the front electrodes of traditional crystalline silicon solar cells are made by traditional screen printing. The screen printing fine grid lines have a small aspect ratio, resulting in relatively large front electrode losses, including shading loss, resistive loss, compound loss, etc. Moreover, the cost of silver electrodes used in current silicon solar cells accounts for 15% of the manufacturing cost of the entire silicon solar cells. . Contents of the invention [0003] The purpose of the present invention is to overcome the above-mentioned defects in the prior art, and provide a front electrode and a preparation method thereof. The front electrode uses less silver, has a large aspect ratio, has a small shading loss, and has low contact resistance, thereby making solar cells The ph...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/0224H01L31/054H01L31/18
CPCH01L31/022425H01L31/054H01L31/1804Y02P70/50Y02E10/547Y02E10/52
Inventor 刘国民
Owner JIANGSU RIYU PHOTOVOTTAIC NEW MATERIAL TECH CO LTD
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