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Polycrystalline solar cell and diffusion technology thereof

A solar cell and diffusion process technology, applied in the field of solar cells, can solve the problems of low conversion efficiency of solar cells, achieve high conversion efficiency, avoid the rise of series resistance, and reduce packaging loss

Active Publication Date: 2015-04-22
ZHEJIANG GUANGLONG ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] In the actual production process, the conversion efficiency of solar cells using the one-step diffusion method in the prior art is generally low

Method used

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  • Polycrystalline solar cell and diffusion technology thereof
  • Polycrystalline solar cell and diffusion technology thereof
  • Polycrystalline solar cell and diffusion technology thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Such as figure 1 As shown, the polycrystalline solar cell includes a plate-shaped body 1, one side of the body 1 is a positive electrode, the other side of the body 1 is a negative electrode, and four main grids 2 and 90 fine grids are evenly distributed on the positive electrode. 3. The main grid 2 and the fine grid 3 are vertically arranged and they are electrically connected. The distance between each main grid 2 is 35 mm, the width of the main grid 2 is 0.8 mm, and the spacing of the fine grid 3 is 1.4 mm. The width is 0.035mm.

[0034] Such as figure 1 As shown, the main grid 2 is arranged longitudinally and uniformly by several main grid segments; the length of each main grid segment is 7 mm; the length of the fine grid 3 is 152 mm.

[0035] Such as figure 2 Shown, the diffusion process of this polycrystalline solar cell, this process comprises the following steps:

[0036] A. Low-temperature deposition: Put the body into an ordinary diffusion furnace, and ke...

Embodiment 2

[0048] Such as figure 1 As shown, the polycrystalline solar cell includes a plate-shaped body 1, one side of the body 1 is a positive electrode, the other side of the body 1 is a negative electrode, and four main grids 2 and 90 fine grids are evenly distributed on the positive electrode. 3. The main grid 2 and the fine grid 3 are vertically arranged and they are electrically connected. The distance between each main grid 2 is 42 mm, the width of the main grid 2 is 1.2 mm, and the spacing of the fine grid 3 is 2.0 mm. The width is 0.045 mm.

[0049] Such as figure 1 As shown, the main grid 2 is arranged longitudinally and uniformly by several main grid segments; the length of each main grid segment is 11 mm; the length of the fine grid 3 is 158 mm.

[0050] Such as figure 2 Shown, the diffusion process of this polycrystalline solar cell, this process comprises the following steps:

[0051] A. Low-temperature deposition: Put the body into an ordinary diffusion furnace. The ...

Embodiment 3

[0062] Such as figure 1 As shown, the polycrystalline solar cell includes a plate-shaped body 1, one side of the body 1 is a positive electrode, the other side of the body 1 is a negative electrode, and four main grids 2 and 90 fine grids are evenly distributed on the positive electrode. 3. The main grid 2 and the fine grid 3 are vertically arranged and they are electrically connected. The distance between each main grid 2 is 38 mm, the width of the main grid 2 is 1.0 mm, and the spacing of the fine grid 3 is 1.7 mm. The width is 0.04 mm.

[0063] Such as figure 1 As shown, the main grid 2 is arranged longitudinally and uniformly by several main grid segments; the length of each main grid segment is 9 mm; the length of the fine grid 3 is 155 mm.

[0064] Such as figure 2 Shown, the diffusion process of this polycrystalline solar cell, this process comprises the following steps:

[0065] A. Low-temperature deposition: Put the body into an ordinary diffusion furnace, and ke...

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Abstract

The invention provides a polycrystalline solar cell and a diffusion technology of the polycrystalline solar cell and belongs to the technical field of solar cells. According to the polycrystalline solar cell and the diffusion technology of the polycrystalline solar cell, the technical problem that in the prior art, the conversion efficiency of a solar cell based on the one-step diffusion method is generally low and other technical problems are solved. The polycrystalline solar cell includes a platy body. A positive electrode is arranged on one side of the body, and a negative electrode is arranged on the other side of the body. Four main grids and ninety fine grids are evenly distributed on the positive electrode. The main grids are perpendicular to the fine grids and are in electric connection with the fine grids. The distances between all the main grids are 35 mm-42 mm, the width of the main grids is 0.8 mm-1.2 mm, the distances between the fine grids are 1.4 mm-2.0 mm, and the width of the fine grids is 0.035 mm-0.045 mm. The polycrystalline solar cell and the diffusion technology of the polycrystalline solar cell have the advantages that encapsulation loss is low, and the conversion efficiency of the polycrystalline solar cell is high.

Description

technical field [0001] The invention belongs to the technical field of solar cells, and relates to a polycrystalline solar cell and a diffusion process thereof. Background technique [0002] The production process of traditional polycrystalline solar cells mainly includes: texturing, diffusion, wet etching, PE coating, drying, printing back field, drying, printing back electrode, printing positive electrode, sintering and test sorting. The diffusion process directly affects the open circuit voltage of polycrystalline solar cells. The main influencing factor is the doping concentration on the surface of the diffusion. High doping concentration on the surface will cause heavy doping effect. The heavy doping effect will cause the narrowing of the forbidden band width, affect the intrinsic carrier concentration, affect the effective doping concentration and reduce the minority carrier lifetime. In silicon crystals, heavy doping can cause changes in the energy band structure, fo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/0224H01L31/18H01L21/223
CPCH01L21/223H01L31/022425H01L31/18H01L31/1804Y02E10/547Y02P70/50
Inventor 朱金浩蒋剑波王猛许布万光耀陈珏荣高非朱庆庆
Owner ZHEJIANG GUANGLONG ENERGY TECH
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