Silver paste for electrode of solar cell and method for preparing silver paste

A solar cell and electrode technology, which is applied in the manufacture of cables/conductors, conductive materials dispersed in non-conductive inorganic materials, circuits, etc., can solve problems such as resolution reduction, achieve smooth surfaces, improve electrical conductivity, and fine and uniform particles Effect

Inactive Publication Date: 2012-07-04
JIANGSU UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In addition, in the process of firing the paste into electrodes, it needs to be fired at a high temperature for a short time. During firing, the existing paste generally has problems such as a decrease in resolution due to shrinkage. Therefore, it is necessary to improve the high-temperature firing of the silver paste. performance is necessary

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] (1) formula by mass percentage:

[0022] Silver Powder 80%,

[0023] Glass powder 9%,

[0024] Organic phase 7.8%,

[0025] Organic solvent 3%,

[0026] Oxide Additive 0.2%.

[0027] (2) Preparation of silver paste and firing electrodes:

[0028] (i) Mix the glass powder evenly, put it into a crucible and melt it, and heat it at 1200°C for 1 hour.

[0029] (ii) After the glass liquid is clarified and uniform, it is directly poured into deionized water for quenching.

[0030] (iii) Ball milling on a ball mill.

[0031] (iv) Sieve the powder after ball milling with a 3000-mesh sieve, and continue ball milling the remaining large particles.

[0032] (v) mixing the sieved glass powder with the silver powder, organic phase, organic solvent and oxide additive in the formula, then thoroughly mixing the mixture in an agate mortar, and then grinding three times on a three-roll mill, Get silver paste.

[0033] (vi) Print the silver paste on the Si substrate with a screen...

Embodiment 2

[0037] (1) formula by mass percentage:

[0038] Silver Powder 80%,

[0039] Glass powder 9%,

[0040] Organic phase 7.5%,

[0041] Organic solvent 3%,

[0042] Oxide Additive 0.5%.

[0043] (2) The steps of preparing silver paste and firing electrodes are the same as those in Example 1.

[0044] (3) Result detection

[0045] The surface of the lead made after sintering is silvery white, smooth and free of defects, the peeling strength is 6.5N / cm, the soldering performance is good, and the photoelectric conversion efficiency of the prepared cell is 19%.

Embodiment 3

[0047] (1) formula by mass percentage:

[0048] Silver Powder 78%,

[0049] Glass powder 10%,

[0050] Organic phase 8%,

[0051] Organic solvent 2.5%,

[0052] Oxide Additive 1.5%.

[0053] (2) The steps of preparing silver paste and firing electrodes are the same as those in Example 1.

[0054] (3) Result detection

[0055] The surface of the lead made after sintering is silvery white, smooth and free of defects, the peeling strength is 7.5N / cm, the soldering performance is good, and the photoelectric conversion efficiency of the prepared cell is 17%.

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Abstract

The invention discloses a silver paste for an electrode of a solar cell and a method for preparing the silver paste. The silver paste comprises the following components by mass percent: 60-85% of silver powder, 8-12% of glass powder, 7-20% of organic phase, 2-8% of organic solvent and 0.1-3% of oxide additive. The silver paste disclosed by the invention has the advantages of excellent high-temperature firing performance; and the electrode fired by the silver paste has high precision and excellent conductivity and is suitable for being applied to battery assemblies with higher photoelectric conversion efficiency.

Description

Technical field: [0001] The invention relates to a silver paste used for solar cell electrodes and a preparation method thereof. The silver paste is especially suitable for silicon solar cell systems requiring high photoelectric conversion efficiency and high printing precision. technical background: [0002] In recent years, with the depletion of global energy sources and the increasing restrictions on CO2 emissions, the development of solar energy, especially crystalline silicon solar energy, has been developing rapidly. At present, my country has become the world's largest production base of solar cells, and most of the raw materials used in the solar industry have been localized, but the silver paste mainly relies on foreign imports, such as DuPont and FERRO. The role of the silver paste is to create an alloy layer for ohmic contact and serve as the lead wire of the battery. Its performance directly affects the key indicator of the solar cell - the photoelectric conversi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B13/00H01L31/0224H01L31/18
CPCY02P70/50
Inventor 杨卫国
Owner JIANGSU UNIV OF SCI & TECH
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