High-conductivity lead-free silver paste used for crystalline silicon solar cell and preparation method thereof

A technology of solar cells and high conductivity, applied to conductive materials dispersed in non-conductive inorganic materials, cable/conductor manufacturing, circuits, etc., can solve problems such as the photoelectric conversion efficiency of series resistors that cannot reach the sintering temperature of nano-silver paste , to achieve the effect of improving photoelectric conversion efficiency, high conductivity, and reducing series resistance

Inactive Publication Date: 2012-03-07
NANCHANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] The silver paste described in patent 200810025431.8 and patent 200810025430.3 uses lead-free glass binder, but the conductive phase uses micron-scale silver powder, which cannot achieve nano-silver doping, which can reduce the sintering temperature of silver paste, reduce the series resistance, and Triple Effect of Improving Photoelectric Conversion Efficiency of Solar Cells

Method used

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  • High-conductivity lead-free silver paste used for crystalline silicon solar cell and preparation method thereof
  • High-conductivity lead-free silver paste used for crystalline silicon solar cell and preparation method thereof
  • High-conductivity lead-free silver paste used for crystalline silicon solar cell and preparation method thereof

Examples

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Effect test

example 1

[0036] 1. The components of the glass adhesive are weighed according to the following weight ratio: Bi 2 o 3 70%; B 2 o 3 20%; SiO 2 10%, followed by mixing the above components evenly and placing them in a high-temperature muffle furnace. The temperature is controlled at 1200°C and kept for 60 minutes, and then the molten glass system is quenched and ball milled;

[0037] 2. The components of the inorganic additives are weighed according to the following weight ratio: Al 2 o 3 20%; MnO 2 20%; MgO 20%; CaO 20%; Ta 2 o 5 20%, and mix the above components evenly in a glass mortar;

[0038] 3. The organic solvent and the organic additive are mixed uniformly with a weight ratio of 5: 1, wherein α-terpineol and 2-ethoxyethyl acetate in the organic solvent are uniformly mixed with a weight ratio of 2: 1;

[0039] 4. After weighing 8% and 62% of micron silver powder with an average particle size of 2.5 μm and 6 μm and 5% of nano silver powder with a particle size of 30...

example 2

[0045] 1. The components of the glass adhesive are weighed according to the following weight ratio: Bi 2 o 3 70%; B 2 o 3 20%; SiO 2 10%, followed by mixing the above components evenly and placing them in a high-temperature muffle furnace. The temperature is controlled at 1200°C and kept for 60 minutes, and then the molten glass system is quenched and ball milled;

[0046] 2. The components of the inorganic additives are weighed according to the following weight ratio: Al 2 o 3 20%; MnO 2 20%; MgO 20%; CaO 20%; Ta 2 o 5 20%, and mix the above components evenly in a glass mortar;

[0047] 3. The organic solvent and the organic additive are mixed uniformly with a weight ratio of 5: 1, wherein α-terpineol and 2-ethoxyethyl acetate in the organic solvent are uniformly mixed with a weight ratio of 2: 1;

[0048] 4. 8% and 57% of micron silver powder with an average particle size of 3.5 μm and 8.5 μm and 10% of nano-silver powder with a particle size of 30nm, 3% of gl...

example 3

[0054] 1. The components of the glass adhesive are weighed according to the following weight ratio: Bi 2 o 3 70%; B 2 o 3 20%; SiO 2 10%, followed by mixing the above components evenly and placing them in a high-temperature muffle furnace. The temperature is controlled at 1200°C and kept for 60 minutes, and then the molten glass system is quenched and ball milled;

[0055] 2. The components of the inorganic additives are weighed according to the following weight ratio: Al 2 o 3 20%; MnO 2 20%; MgO 20%; CaO 20%; Ta 2 o 5 20%, and mix the above components evenly in a glass mortar;

[0056] 3. The organic solvent and the organic additive are mixed uniformly with a weight ratio of 5: 1, wherein α-terpineol and 2-ethoxyethyl acetate in the organic solvent are uniformly mixed with a weight ratio of 2: 1;

[0057] 4. 8.5% and 61.5% of micron silver powder with an average particle size of 3 μm and 7 μm and 5% of nano silver powder with a particle size of 20nm, 3% of gla...

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Abstract

The invention discloses a high-conductivity lead-free silver paste used for a crystalline silicon solar cell and a preparation method thereof. The high-conductivity lead-free silver paste is prepared by compounding nano silver powder and micro silver powder, wherein a silver electrode formed by performing optimized grading and sintering on the micro silver powder has extremely high conductivity. The nano-modified high-conductivity lead-free silver paste comprises the following components in percentage by weight: 8 to 9 percent of micro silver powder with the grain diameter of 2 to 4.5 mu m, 56 to 62 percent of micro silver powder with the grain diameter of 5 to 10 mu m, 5 to 10 percent of nano silver powder, 3 to 5 percent of glass cement, 3 to 5 percent of inorganic additive, and 15 to 20 percent of organic carrier, wherein the grain diameter of the nano silver powder is 20 to 70 nm; the glass cement is a bismuth-silicon-boracium mixed glass system; and the organic carrier consists of an organic solvent and an organic additive. The high-conductivity lead-free silver paste has a simple preparation process, is simple and easy to produce in large scale, and has practical significance of improving the photoelectric conversion efficiency of the crystalline silicon solar cell.

Description

technical field [0001] The invention relates to the technical field of silver paste for front electrodes of crystalline silicon solar cells, in particular to a method for preparing nano-modified high-conductivity lead-free silver paste for crystalline silicon solar cells. technical background [0002] A solar cell is a device that directly converts light energy into electrical energy through the photoelectric effect or photochemical effect. The silver electrode of a solar cell is a component that converts the current output generated in this process into electrical energy. [0003] The performance of solar cells depends not only on the concentration, distribution and mobility of carriers in the semiconductor materials used, but also on the performance of the positive and negative electrodes. The quality of the positive electrode directly affects the series resistance, shunt resistance, fill factor and photoelectric conversion efficiency of the solar cell. Therefore, the pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B13/00H01L31/0224
Inventor 杜国平罗晖陈楠
Owner NANCHANG UNIV
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