Composition of lead-free conductive slurry for crystalline silicon solar cell and preparation method for lead-free conductive slurry

A technology of solar cells and conductive paste, applied in conductive materials, circuits, photovoltaic power generation, etc. dispersed in non-conductive inorganic materials, to achieve the effect of ensuring ohmic contact, reducing contact resistance, and good electrical conductivity

Inactive Publication Date: 2016-04-13
WUHAN BOXIN TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this type of glass powder contains metal substances that pollute the environment such as lead, and the glass powder made of silver conductive paste needs lead to achieve high-efficiency electrical performance. Therefore, it is necessary to find a lead-free glass to replace the previous one. Leaded glass, and meet the requirements of electrical properties, adhesion, reliability, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The mass percentage is calculated as 70 parts of silver powder, 2.5 parts of organic binder, 27 parts of inorganic glass and 0.5 parts of inorganic additives, put them into a vacuum mixer, and keep stirring for about 2 hours to form a uniform mixture; then disperse through a three-roll mill , ground into a homogeneous slurry with a scraper fineness of ≤10 μm and a viscosity of 40-60 pa.s, and then filtered through a 225-mesh screen to obtain the silver conductive paste of the present invention.

Embodiment 2

[0019] The mass percentage is calculated as 60 parts of silver powder, 4.5 parts of organic binder, 35 parts of inorganic glass and 0.5 parts of inorganic additives, put them into a vacuum mixer, and keep stirring for about 2 hours to form a uniform mixture; then disperse through a three-roll mill , ground into a homogeneous slurry with a scraper fineness of ≤10 μm and a viscosity of 40-60 pa.s, and then filtered through a 225-mesh screen to obtain the silver conductive paste of the present invention.

Embodiment 3

[0021] The mass percentage is calculated as 65 parts of silver powder, 46 parts of organic binder, 328.5 parts of inorganic glass and 0.5 parts of inorganic additives, put them into a vacuum mixer, and keep stirring for about 2 hours to form a uniform mixture; then disperse through a three-roll mill , ground into a homogeneous slurry with a scraper fineness of ≤10 μm and a viscosity of 40-60 pa.s, and then filtered through a 225-mesh screen to obtain the silver conductive paste of the present invention.

[0022] In the three embodiments, the silver powder is a spherical silver powder with an average particle size of 0.5-1.5 μm, a specific surface area of ​​1.0-1.5%㎡ / g, and a tap density of 4.0-4.5g / ml. It can be purchased in the market; lead-free glass is SHBF-160 series low-melting glass, which is today's environmentally friendly low-melting glass; inorganic additives are made from Ti, Zn, Fe three metals, and Ti, Zn, Fe Choose one of the oxide powders, the average particle s...

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Abstract

The invention relates to a composition of lead-free conductive slurry for a crystalline silicon solar cell and a preparation method for the lead-free conductive slurry. The slurry is prepared from the following raw materials in percentage by mass: 55-70% of silver powder, 1-15% of inorganic glass powder, 20-35% of organic binder and 0.5-1% of inorganic auxiliaries. According to the preparation method, SHBF-160 series glass is taken as an inorganic binding phase of the silver conductive slurry, so that high wettability and reactivity with a base material are obtained, and the sintering of the silver powder is facilitated; consequently, a back surface silver electrode is high in conductivity, weldability, soldering resistance, adhesive force and reliability, and the lead-free silver conductive slurry is realized; Ti, Zn, Fe, metal powder or other oxide powder are added to the silver conductive slurry, so that the contact resistance between the silver electrode and the silicon base material is reduced, and the ohmic contact between the sintered silver electrode and the base material is ensured under the premise of not affecting the weldability, soldering resistance, adhesive force and reliability of the sintered silver electrode.

Description

technical field [0001] The invention belongs to the field of crystalline silicon solar cell panels, and in particular relates to the composition and preparation method of a lead-free conductive paste for crystalline silicon solar cells. Background technique [0002] With the consumption of non-renewable energy, the human demand for new clean energy is becoming more and more urgent. Crystalline silicon solar cells are just the representative of new energy sources, which are cells that convert sunlight energy into electrical energy. At present, in order to ensure a high photoelectric conversion rate, some improvements are usually made to the conductive paste on the monocrystalline silicon plate, which requires good adhesion between the silver electrode and the substrate; in production, the properties of the sintered film layer of the silver conductive paste Under certain sintering conditions, it depends on the glass powder used as the inorganic binder phase in the silver cond...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01L31/0224
CPCH01B1/22H01L31/022425Y02E10/50
Inventor 张超
Owner WUHAN BOXIN TECH CO LTD
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