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A kind of conductive paste for solar cell

A technology of conductive paste and conductive metal powder, which is applied in the direction of conductive materials, circuits, and electrical components dispersed in non-conductive inorganic materials, can solve the problems of low photoelectric conversion efficiency of batteries, and achieve the improvement of photoelectric conversion efficiency and photoelectric conversion. The effect of high efficiency and good construction performance

Active Publication Date: 2017-04-12
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing conductive paste still has many problems in the process of preparation and construction, which will lead to low photoelectric conversion efficiency of the prepared battery

Method used

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  • A kind of conductive paste for solar cell
  • A kind of conductive paste for solar cell

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] (1) Preparation of organic carrier

[0037] According to the mass ratio, butyl carbitol: terpineol: butyl carbitol acetate=70:20:10 is mixed evenly to form the organic solvent used for the conductive paste. Dissolve 5 parts (parts by weight, the same below) of ethyl cellulose with an ethoxy content of 49.6% by weight and a viscosity specification of 100mPa·s, and 1.5 parts of cetyl alcohol in 93.5 parts of an organic solvent, and heat to 100°C , Stir for 1h, make it fully dissolved, and cool to obtain an organic vehicle.

[0038] (2) Preparation of conductive paste

[0039] Put 23.5 parts of the organic carrier obtained in step (1) into the stainless steel tank of the high-speed disperser, and add 1.5 parts of glass powder for aluminum conductive paste (model V2027, PbO-B 2 o 3 -SiO 2 series of glass powders, the glass powders used in the following examples to prepare aluminum conductive pastes are the same), stir evenly; then add 75 parts of spherical aluminum powd...

Embodiment 2

[0041] (1) Preparation of organic carrier

[0042] According to the mass ratio, butyl carbitol: terpineol: butyl carbitol acetate=70:20:10 is mixed evenly to form the organic solvent used for the conductive paste. Dissolve 4 parts of ethyl cellulose with an ethoxy content of 51.0% by weight and a viscosity specification of 150 mPa·s, and 1 part of cetyl alcohol in 95 parts of an organic solvent, heat to 90 ° C, stir for 2 hours, and make it fully Dissolved and cooled to obtain an organic vehicle.

[0043] (2) Preparation of conductive paste

[0044] Put 29.5 parts of the organic carrier obtained in step (1) into the stainless steel tank of the high-speed disperser, add 0.5 parts of glass powder for aluminum conductive paste while stirring, and stir evenly; then add 70 parts of spherical aluminum powder, and the aluminum powder is divided into Add three times, stir well after each addition, and then add the next time; after all the addition is completed, stir at a high speed ...

Embodiment 3

[0046] (1) Preparation of organic carrier

[0047] Take butyl carbitol according to the mass ratio: butyl carbitol acetate=80:20 and mix evenly to form the organic solvent used for the conductive paste. The content of 4.5 parts of ethoxy groups is 53.0% by weight, and the viscosity specification is ethylcellulose of 200mPa·s, 3 parts of alkyd resin (brand is AK2010), 5 parts of cetyl alcohol, dissolve in 87.5 parts of organic solvents, Heat to 120°C, stir for 0.5h to fully dissolve, and cool to obtain an organic carrier.

[0048] (2) Preparation of conductive paste

[0049] Put 20 parts of the organic carrier obtained in step (1) into the stainless steel tank of the high-speed disperser, add 3 parts of glass powder for aluminum conductive paste while stirring, and stir evenly; then add 77 parts of spherical aluminum powder, and the aluminum powder is divided into Add three times, stir well for each addition, and then add the next time; after all the addition is completed, st...

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Abstract

The invention relates to a conductive paste for a solar battery. The conductive paste for the solar battery is composed of conductive metal powder, glass powder and an organic carrier, wherein the organic carrier contains thickener, organic solvent and lubricant, the thickener contains ethyl cellulose, the ethyoxyl content of the ethyl cellulose is 49.6-53.0% by weight percentage. The conductive paste for the solar battery is high in workability, avoids screen leakage when standing on a screen mesh for a long time, achieves shear-free flowing even at relatively low temperature, and avoids sedimentation and caking at the bottom of tank even being stored for a long time. Patterns obtained through screen printing are order in boundary, clear, good in effects and low in organic residue after being burnt; metal film formed through the conductive paste is smooth and flat, good in attachment to a silicone substrate; a solar plate prepared through the conductive paste is high in photoelectric conversion efficiency.

Description

technical field [0001] The invention relates to a conductive paste for solar cells. Background technique [0002] Conductive paste is one of the electronic information materials, and it is also the main auxiliary material for making crystalline silicon solar cells. The production and construction process of conductive paste have a great influence on its performance. The conductive paste is usually composed of conductive powder, glass powder and organic vehicle, and the organic vehicle is composed of thickener, thixotropic agent and organic solvent. The commonly used thickener is ethyl cellulose, nitrocellulose or resin products, the most commonly used is ethyl cellulose, wherein the content of ethoxy in ethyl cellulose is in the range of 44.0-49.5% by weight Inside, which is known as K-type or N-type ethyl cellulose on the market. The role of the thickener is to dissolve in the organic solvent to form a viscous solution to provide viscosity. [0003] The thixotropic agent...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B1/22H01L31/0224
Inventor 谭伟华
Owner BYD CO LTD
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