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Solar cells with reflectors

A technology of solar cells and reflectors, applied in the field of solar cells, can solve the problems of front shading loss, benefit, and large shading loss of finger grid lines, so as to improve conversion efficiency and avoid shading loss

Active Publication Date: 2017-06-23
凤阳瞩日能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the width of the screen-printed front electrode finger lines is generally 50-100 microns, and due to the technical bottleneck of the screen printing technology itself, it is difficult to further reduce the width of the finger lines, which inevitably results in a 5-10% Frontal shading loss left and right
[0005] In order to further reduce the shading loss caused by the front electrodes, many new technologies have been developed in the industry, such as reducing the width of the finger grid lines by electroplating or inkjet printing, so that the width of the front finger grid lines can be 40 microns or even narrower, but even so, the shading loss of the finger grid line is still relatively large, and cannot be completely eliminated or further significantly reduced
At the same time, these technologies are also relatively expensive, and it is difficult to bring benefits to the entire industry
[0006] In addition, there is also a full back contact technology, using this technology, the positive and negative electrodes of the solar cell are made on the back of the battery, thus completely eliminating the shading loss of the front electrode, but this technology requires more and more precise The production cost of processing equipment and production technology will be more expensive, and it is difficult to introduce and apply it to the current general commercial production line

Method used

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  • Solar cells with reflectors
  • Solar cells with reflectors
  • Solar cells with reflectors

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0047] Step 1: Solar Cell Preparation

[0048] Select a P-type polycrystalline solar cell with a size of 156mm*156mm, and make a front electrode by screen printing, wherein the printed front finger grid has a width of 80 microns, a height of 15 microns, and a length of 153 mm. The distance between the two most edge finger grid lines and the edge of the cell is 1.5mm. The battery with the printed front and back electrodes is subjected to a sintering test, and the subsequent steps are awaited. The aforementioned front electrode can also be prepared by spraying.

[0049] Step 2: Prepare the reflector

[0050] Prepare a triangular reflective strip with a base length of 100 microns, a height of 150 microns, and a length of 153 mm by stamping or injection molding, clean its three surfaces, and then spray a specular shot layer on its three surfaces, and One bottom edge is coated with a 30 micron thick adhesive layer.

[0051] Step 3: Integrate the reflector on the solar cell

[...

Embodiment 2

[0055] Step 1: Solar Cell Preparation

[0056] Select a P-type polycrystalline solar cell with a size of 156mm*156mm, and make a front electrode by screen printing, wherein the printed front finger grid has a width of 80 microns, a height of 15 microns, and a length of 153 mm. The distance between the two most edge finger grid lines and the edge of the cell is 1.5mm. The battery with the printed front and back electrodes is subjected to a sintering test, and the subsequent steps are awaited. The front electrode mentioned above can also be prepared by spraying, or by other processes such as line-enhanced metallization technology.

[0057] Step 2: Prepare the reflector

[0058] Use transparent materials to prepare triangular groove rows with a base length of 100 microns, a height of 150 microns, and a length of 153 mm by stamping or injection molding. The two surfaces of the triangular groove are smooth and clean, and then the mirror reflection layer is sprayed on both sides,...

Embodiment 3

[0063] Step 1: Prepare solar cells with contact electrodes in advance

[0064] Select a P-type polycrystalline solar cell with a size of 156mm*156mm, and make a front electrode by screen printing, wherein the printed front finger grid has a width of 80-150 microns, a height of 5 microns to 15 microns, and a length of 153 mm. The distance between the two most edge finger grid lines and the edge of the cell is 1.5mm. Put the battery with printed front and back electrodes into a sintering furnace for sintering, and wait for the next step. The aforementioned front electrode can also be prepared by spraying.

[0065] Step 2: Prepare a light-reflective conductor with a flux layer

[0066] The copper copper wire is drawn into a round copper wire with a diameter of 60 microns by a drawing process, and then a layer of lead-tin flux layer with a thickness of about 20 microns is coated on it by a thermal coating process; The wire is placed in the stamping die and punched, so that the ...

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PUM

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Abstract

The invention provides a solar battery with a reflector. The solar battery comprises a battery plate substrate, wherein a gate line used for converging electrons on the battery plate substrate is arranged on the battery plate substrate; the reflector used for reflecting light on the gate line in a no-hiding bare area on the battery plate substrate is arranged on the gate line; a triangle is formed by two reflection planes of the reflector and a plane on which the gate line is located; the reflector is arranged along the extending direction of the gate line. According to the solar battery, the reflector is arranged on the upper part of the gate line in parallel or in vertical so as to reduce the incidence loss of light, enhance the conductivity of the gate line, conduct and converge the current and reduce or completely eliminate the loss of incident light because of the occlusion of an electrode on the front surface of the battery, thereby improving the generating efficiency of the solar battery.

Description

technical field [0001] The invention relates to the battery field, in particular to a solar battery with a light reflector. Background technique [0002] Solar cells are photovoltaic devices made of one or several photoelectric quantum effects based on the specific morphology and structure of related materials, such as silicon materials, gallium arsenide, tellurium sulfide and other semiconductor materials or other organic or inorganic materials. compound material. Solar cells are generally made of these host materials through a special process to form a structure that can realize photoelectric conversion and combined with certain metallization techniques. [0003] The main processing technology of crystalline silicon solar cells is mainly to form a functional structure that can absorb light with maximum efficiency and enable photons to generate corresponding hole-electron pairs after entering the matrix material, and then pass through the metallization technology to genera...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/054
CPCY02E10/52
Inventor 余小翠
Owner 凤阳瞩日能源科技有限公司