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Organic bond and preparation method thereof for front silver paste of crystalline silicon solar cell

An organic binder and solar cell technology, which is applied in the direction of binder types, cellulose binders, non-polymer binder additives, etc., can solve problems such as difficult drying, and achieve easy operation and simple preparation process. , the effect of low residual

Active Publication Date: 2015-04-01
GUANGZHOU RUXING TECH DEV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

If volatilization is too fast, it is not easy to form holes and micro-cracks on the surface of the film layer, but if it is too slow, it will make it difficult to dry after coating, and there will be defects after sintering.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] In parts by mass, 4 parts of ethyl cellulose, 2 parts of acrylic resin, 5 parts of Tween-20, 18 parts of ethylene glycol propyl ether, 30 parts of butyl carbitol acetate, 6 parts of butyl oleate, diethylene glycol 35 parts of alcohol monobutyl ether acetate. The raw materials constituting the organic binder were put into the reaction kettle in proportion, and stirred and mixed electrically at a speed of 150 rpm for 60 minutes. Then, the temperature of the reaction kettle was set to 90° C., the speed of the stirring paddle was set to 200 rpm, and the mixture was stirred at constant temperature for 4 hours to form a homogeneous solution. Natural cooling, detection. Its boiling range is 120-300°C, its viscosity is 860mpa·S (Brookfeild viscometer), and its residue by thermogravimetric analysis at 0-600°C is 1.2%.

[0023] The organic binder, silver powder, and inorganic binder are prepared in a certain proportion to make a front silver paste, and the silver paste is print...

Embodiment 2

[0025] In parts by mass, 8 parts of ethyl cellulose, 1 part of acrylic resin, 3 parts of Tween-20, 30 parts of ethylene glycol propyl ether, 25 parts of butyl carbitol acetate, 10 parts of butyl oleate, diethylene glycol 23 parts of alcohol monobutyl ether acetate. The raw materials constituting the organic binder were put into the reaction kettle in proportion, and stirred and mixed by electric motor at a speed of 150 rpm for 45 minutes. Then, the temperature of the reaction kettle was set to 100° C., the speed of the stirring paddle was set to 200 rpm, and the mixture was stirred at constant temperature for 3 hours to form a homogeneous solution. Natural cooling, detection. Its boiling range is 120-300°C, its viscosity is 760mpa·S (Brookfeild viscometer), and its residue by thermogravimetric analysis at 0-600°C is 0.7%.

[0026] The organic binder, silver powder, and inorganic binder are prepared in a certain proportion to make a front silver paste, and the silver paste is...

Embodiment 3

[0028] In parts by mass, 10 parts of ethyl cellulose, 5 parts of acrylic resin, 3 parts of Tween-40, 28 parts of ethylene glycol propyl ether, 16 parts of butyl carbitol acetate, 8 parts of butyl oleate, diethylene glycol 30 parts of alcohol monobutyl ether acetate. The raw materials constituting the organic binder were put into the reaction kettle in proportion, and electric stirring and mixing were performed at a speed of 180 rpm for 50 minutes. Then, the temperature of the reaction kettle was set to 110° C., the speed of the stirring paddle was set to 230 rpm, and the mixture was stirred at constant temperature for 4 hours to form a homogeneous solution. Natural cooling, detection. Its boiling range is 120-300°C, its viscosity is 1160mpa·S (Brookfeild viscometer), and its residue by thermogravimetric analysis at 0-600°C is 0.4%.

[0029] The organic binder, silver powder, and inorganic binder are prepared in a certain proportion to make a front silver paste, and the silve...

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Abstract

The invention discloses an organic bond for front silver paste of a crystalline silicon solar cell. The organic bond comprises, by mass, 4-10 parts of ethyl cellulose, 0-5 parts of acrylic resin, 0-10 parts of Tween, 15-30 parts of ethylene glycol propyl ether, 10-30 parts of butyl carbitol acetate, 5-10 parts of butyl oleate and 15-35 parts of diethylene glycol monobutyl ether acetate. The invention further discloses a preparation method for the organic bond. According to the organic bond, the boiling range is 120-300 DEG C, the viscosity is 270-1300mPa*S (by Brookfield viscosity), and thermogravimetric analysis (TGA) residues under 0-600 DEG C is 0-2%. The front silver paste prepared by the organic bond has a good dispersity and has no delamination and sedimentation after placed still for a long time; the average conversion efficiency for mass production is >=18.3% when the silver paste is applied to a monocrystalline silicon solar cell, and the average conversion efficiency for mass production is >=17.0% when the silver paste is applied to the crystalline silicon solar cell; and the welding tensile force of the silver paste when applied onto the crystalline silicon solar cell is 2.5N (leaded or lead-free welding through a solder strip in 180 degrees).

Description

technical field [0001] The invention relates to a crystalline silicon solar cell, in particular to an organic binder for front silver paste of a crystalline silicon solar cell and a preparation method thereof. Background technique [0002] The organic binder is one of the main components of the front silver paste for crystalline silicon solar cells, which is used to provide a stable dispersion system for the silver paste and is responsible for the bonding before sintering. Its selection directly affects the leveling, viscosity, adhesion and drying and sintering characteristics of the silver paste. [0003] Organic adhesives are mainly composed of polymer resins, organic solvents and surfactants. Among them, the role of the polymer resin is to determine the viscosity and plasticity of the front silver paste, such polymers are generally network or chain. The function of the organic solvent is to change the interaction between the silver particles and between the silver parti...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C09J101/28C09J133/00C09J11/06H01B1/16H01B1/22
Inventor 丁冰冰倪妙妮
Owner GUANGZHOU RUXING TECH DEV