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Composition and preparation method of silicon solar battery electrode slurry

A technology for silicon solar cells and electrode paste, which is used in circuits, electrical components, and final product manufacturing, etc., can solve problems such as inability to achieve, and achieve the effects of increasing coverage, improving electrical performance, and improving ohmic contact.

Inactive Publication Date: 2010-02-17
谭富彬
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this purpose, relying on artificial functional elements added in advance cannot be achieved at high temperature and high speed.
In addition, the conversion efficiency of the battery is also related to the smoothness of the grid on the sunny side and the back field electrode. The smoother the electrode and the greater the coverage of silicon, the power per unit area of ​​the battery will be increased. Battery manufacturers require the elimination of metal beads on both sides of the electrode, Bubbles, burrs and de-powdering phenomena have not been solved by any slurry production technology so far

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1: Preparation of silver grid paste on the sunny side 78.0% spherical silver powder, 0.20% antimony powder, 1.0% antimony silicide powder (SbSi), 99.4% by mass of Sb in the antimony silicide powder, 0.6% by mass of Si, and 6.0% by mass of glass powder %, organic binder 14.8%, the mixture is rolled by a three-roll mill to a particle size of 2.5 μm and a viscosity of 102,000 mpa·s. The measured square resistance is 2.7mΩ / □, and the line resolution is 0.123mm. It is matched with domestic FP-3HD aluminum paste and FERRO3398 silver-aluminum paste. After high-temperature and high-speed sintering, the surface is silvery white and smooth. The original thickness of monocrystalline silicon is 0.18mm, the size is 125×125mm, and the bending is less than 1.0mm. The solderability of the solder is good, and the peeling force of the lead tape is 320g. The average photoelectric conversion efficiency of the battery is 17.28%.

Embodiment 2

[0029] Example 2: Preparation of silver-aluminum paste for back field: 77.0% spherical silver powder. Spherical aluminum powder 3.2%. Silicide gold powder (AuSi) 0.8%, silicide gold powder contains Au 96.8 mass%, Si 3.2 mass%, glass powder 6.0 mass%, organic binder 13.0 mass%. The mixture was rolled by a three-roll mill to a particle size of 10.0 μm and a viscosity of 97,000 mpa·s. The measured square resistance was 3.2mΩ / □. It is matched with domestic FP-3HD aluminum paste and DuPont PV149 silver paste. The original thickness of printed monocrystalline silicon is 0.18mm, and the size is 125×125mm. After high-temperature and high-speed sintering, the surface is silvery white and smooth. mm wide lead tape, good soldering, peeling force 312g. The average photoelectric conversion efficiency of the battery is 17.32%.

Embodiment 3

[0030] Example 3: Preparation of aluminum slurry for back field: 70% by mass of aluminum powder, 0.5% by mass of indium powder, 16% by mass of organic binder, 4% by mass of inorganic binder, 9.5% by mass of manganese silicide powder, manganese silicide powder containing 95% by mass of Mn, 5% by mass of Si, the total amount is 100%. Weigh and mix uniformly according to the above formula, and use a three-roll mill to roll to a particle size of 22-25 μm and a viscosity of 30000-40000 mpa·s. Obtain the back field aluminum paste product. The obtained aluminum paste is off-white and smooth after sintering, the EVA bonding is qualified, and the photoelectric conversion efficiency is high.

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Abstract

The invention relates to composition and a preparation method of silicon solar battery electrode slurry. The silicon solar battery electrode slurry comprises silicon solar battery sunny slope grid electrode silver slurry, back surface field silver-aluminium slurry and back surface field aluminium slurry which are used for preparing an ohm contact layer containing silicon alloy powder. In the invention, silver powder, aluminium powder, a simple substance element and the silicon alloy powder are used as raw materials, and an organic bond and an inorganic bond are used as accessories, and after the raw materials and the accessories are evenly mixed, a three-roller rolling mill is utilized to roll the mixture into the silicon solar battery electrode slurry of which the fineness is 20.0-25.0mum and the viscosity is 20000-40000mpa.s.

Description

1. Technical field: [0001] The invention relates to a composition and a preparation method of a silicon solar cell electrode paste, which is a method for preparing electronic information material—conductive paste by a chemical method, and belongs to the technical field of chemical preparation. 2. Background technology: [0002] The silver paste of the grid on the sunny side of the silicon solar cell, the aluminum paste of the back field, and the silver-aluminum paste are one of the electronic information materials. Solar energy is an inexhaustible green energy. Silicon solar cells are one of them. In recent years, the rapid development of silicon solar cells at home and abroad, only my country's production last year exceeded 2000MW. The grid silver paste on the sunny side is made by mixing and rolling chemically reduced silver powder, adding ohmic contact elements, glass powder, and organic binder. Back-field silver-aluminum paste is made by mixing and rolling chemically r...

Claims

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Application Information

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IPC IPC(8): H01L31/0224H01L31/18
CPCY02P70/521Y02P70/50
Inventor 谭富彬谭朝亮谭浩巍迟超
Owner 谭富彬
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