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Solar cells, assemblies, systems and methods for producing solar cells

A solar cell and cell technology, applied in the field of solar cells, can solve the problems of low welding strength, poor reliability and stability, etc.

Active Publication Date: 2020-10-09
CHANGCHUN YONGGU TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the extremely low welding strength between the welding strip and the aluminum back field, the welding strip is fixed by adhesive tape, which has poor reliability and stability

Method used

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  • Solar cells, assemblies, systems and methods for producing solar cells
  • Solar cells, assemblies, systems and methods for producing solar cells
  • Solar cells, assemblies, systems and methods for producing solar cells

Examples

Experimental program
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preparation example Construction

[0150] According to the preparation method of the present invention, the sintering temperature of the front silver electrode is 750-1000°C; the sintering temperature of the aluminum back field is 450-650°C. Preferably, the sintering temperature of the front silver electrode is 800-950°C; the sintering temperature of the aluminum back field is 550-650°C. In a specific embodiment, the sintering temperature of the front silver electrode is 850°C; the sintering temperature of the aluminum back field is 580°C. Of course, the simultaneous sintering of the front silver electrode and the aluminum back field can be realized after drying separately, and one sintering is completed.

[0151] In the method of the present invention, the curing condition is to keep a constant temperature for 20 seconds to 5 hours at a temperature of 90-250° C., more preferably to cure in an oven at a temperature of 140-180° C. for 0.5 to 1.5 hours, or more preferably at 140° C. Curing at -180°C for 20 secon...

Embodiment 1

[0177] In this embodiment, epoxy resin-based conductive adhesive is used. Specifically, the epoxy resin is prepared according to the following method.

[0178] The components used to prepare the conductive adhesive are as follows:

[0179] 6 parts of epoxy resin DER-354 (Dow Chemical), 4 parts of epoxy resin DER-852 (Dow Chemical), 2 parts of curing agent diaminodiphenylsulfone (Nanjing Chemical Reagent Co., Ltd.), 1 part of diluent , 10 parts of 4-butanediol diglycidyl ether (Aladdin reagent), 75 parts of flake silver powder (METALOR), 2 parts of curing accelerator 1,1-dimethyl-3-phenylurea (Aladdin reagent) , 0.5 parts of conduction accelerator succinic acid (Aladdin reagent), 0.5 parts of coupling agent Z6040 (DOWCORNING), the sum of the above components is 100 parts.

[0180] The preparation method of conductive adhesive is as follows:

[0181] First mix the above epoxy resin with the above diluent and coupling agent evenly, then add the above curing agent, the above con...

Embodiment 2

[0188] Prepared according to the same method as Example 1, except that only 5 parts of epoxy resin DER-354 is used, no other epoxy resin is used, and the amount of 1,4-butanediol diglycidyl ether diluent is changed to 5 parts Part, 1 part of diaminodiphenyl sulfone curing agent, 1 part of 1,1-dimethyl-3-phenylurea curing accelerator is changed into 1 part, and flake silver powder is changed into 88 parts, according to the same as embodiment 1 The conductive adhesive was prepared in this way.

[0189] The crystalline silicon substrate was processed in the same manner as in Example 1, and what was used here was an N-type single-sided single-crystal cell (wherein the difference from Example 1 was only in the diffusion process, and powdered boron nitride Press the tablet for diffusion, the diffusion temperature is 950-1000°C, and the diffusion time is 15-30min). In addition to coating 3 spacer lines with a width of 2mm and a total length of 120mm on the aluminum back field, the pa...

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Abstract

The invention relates to a solar cell sheet with no back silver electrodes, an assembly comprising the solar cell sheet with no back silver electrodes, a system and a preparation method of the solar cell sheet. The solar cell sheet comprises an aluminum back field, a back surface passivation layer, a crystalline silicon substrate, a front surface passivation layer, an anti-reflection film, positive silver fine gate lines, and positive silver electrodes which are disposed sequentially from bottom to top; the aluminum back field is provided with the back surface electrode formed by curing conductive paste. With the solar cell sheet, the assembly, system and preparation method of the embodiments of the invention adopted, the cost of back silver paste can be decreased; screen printing processsteps can be simplified; the difficulty of a screen printing process can be lowered; no back silver electrodes are adopted, however, the conductivity of the solar cell sheet with is equivalent to theconductivity of a solar cell sheet with aback silver electrode; the passivation area of the aluminum back field is increased, and photon utilization efficiency can be improved.

Description

technical field [0001] The invention belongs to the field of solar cells and relates to a solar cell without a back silver electrode, a component and a system including the solar cell without a back silver electrode, and a preparation method of the solar cell. Background technique [0002] A solar cell is an energy conversion device that converts light energy into electrical energy. The working principle of a solar cell is based on the photovoltaic effect of a semiconductor P-N junction. Among them, crystalline silicon solar cells are the most widely used solar cells. [0003] Conventional crystalline silicon solar cells are made into cells containing P-N junctions through processes such as texturing, diffusion, etching, and coating, which generate potential differences under sunlight. In order to draw electric current, need make positive and negative two electrodes on P-N junction. The most common method for making electrodes is screen printing, which usually includes bac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/0224H01L31/04H01L31/18
CPCH01L31/022441H01L31/04H01L31/18Y02E10/50
Inventor 郑岩王群刘姝李丹飞郑岚赵柏杨
Owner CHANGCHUN YONGGU TECH
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