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Solar cell front sliver paste adaptable to low-temperature sintering

A solar cell and low-temperature sintering technology, which is applied to conductive materials, circuits, and electrical components dispersed in non-conductive inorganic materials, can solve the problems of high cost, complicated preparation process, and low sintering activity, and achieve low contact resistance, The effect of good compactness and low cost

Active Publication Date: 2013-03-27
JIANGSU RUIDE NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the structure of the silver film is not dense enough after sintering of silver powder with a single particle size.
At the same time, if silver powder with a single large particle size is used, its sintering activity is not high, and the reduction of sintering temperature cannot be realized; if nanometer or submicron silver powder is used, although the sintering activity can be improved, its preparation process is complicated, costly, and low. High conductivity cannot be achieved when the filling amount is used, and a high filling amount is often required to achieve high conductivity, which is not conducive to improving the competitiveness of the product in the market

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The invention is a solar cell front silver paste suitable for low-temperature sintering. Its components and weight percentages are: 85% of high tap density silver powder, 5% of low-temperature glass powder, 0.1% of sintering accelerator and 9.9% of organic carrier. Among them, the sintering accelerator is zinc; the tap density of high tap density silver powder is >5.5 g / cm 3 , consisting of submicron silver powder with an average particle size of 0.1-2 μm and micron silver powder with an average particle size of 2-5 μm, the weight ratio of submicron silver powder and micron silver powder is 50%:50%, and both are spherical or spherical; low temperature The softening point of glass powder is 350-450℃, the average particle size is 2 20%, Al 2 o 3 5%, MgO 7%, ZnO 8%; organic carrier consists of terpineol, polymethylmethacrylate, polyvinylpyrrolidone, castor oil, ethanol according to the weight of 60%:10%:10%:10%:10% than the composition of the mixture.

Embodiment 2

[0018] The present invention is a solar cell front silver paste suitable for low temperature sintering. Its components and weight percentages are: high tap density silver powder 55%, low temperature glass powder 4%, sintering accelerator 5%, inorganic additive 0.1%, organic carrier 35.9%. Among them, the sintering accelerator is tin; the tap density of high tap density silver powder is >5.5 g / cm 3 , consisting of submicron silver powder with an average particle size of 0.1-2 μm and micron silver powder with an average particle size of 2-5 μm, the weight ratio of submicron silver powder and micron silver powder is 20%:80%, and both are spherical or spherical; low temperature The softening point of the glass powder is 350-450°C, the average particle size is 2 1%, Al 2 o 3 3%, MgO 10%, ZnO 1%; the inorganic additive is a mixture of MgO and CaO in a weight ratio of 50%:50%; %:35%:4%:6% of the mixture by weight.

Embodiment 3

[0020] The invention is a solar cell front silver paste suitable for low-temperature sintering. Its composition and weight percentage are: 90% of high tap density silver powder, 1% of low-temperature glass powder, 1% of sintering accelerator and 8% of organic carrier. Among them, the sintering accelerator is a mixture of antimony oxide and cobalt oxide in a weight ratio of 1:1; the tap density of the high tap density silver powder is >5.5 g / cm 3 , consisting of submicron silver powder with an average particle size of 0.1-2 μm and micron silver powder with an average particle size of 2-5 μm, the weight ratio of submicron silver powder and micron silver powder is 40%:60%, and both are spherical or spherical; low temperature The softening point of the glass powder is 350-450°C, the average particle size is 2 10%, Al 2 o 3 0.5%, MgO 9.5%, ZnO 10%; the organic vehicle is composed of butyl carbitol acetate, rosin, dibutyl phthalate, and Dispers 655 in a weight ratio of 65%:20%:5%...

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Abstract

The invention relates to solar cell front sliver paste adaptable to low-temperature sintering. The solar cell front sliver paste adaptable to low-temperature sintering comprises, by weight percent, 55-90% of high tap density sliver powder, 1-5% of low temperature glass powder, 0.1-5% of sintering aid, 0-3% of inorganic additive, and the balance of organic carrier. The sintering aid is made from one or any of zinc, tin, cobalt, stadium and their compounds. The high tap density sliver powder is spherical or sphere-like and is 5.5g / cm<3> in tap density. The low-melting-point glass powder softens at 350-450 DEG C and is smaller than 2 micrometers in average particle size. Peak sintering temperature of the front sliver paste can be lowered. Production efficiency is improved while product performance is guaranteed. The solar cell front sliver paste adaptable to low-temperature sintering adapts to the future development trend of environment protection and energy conservation. In addition, the sliver paste is low in sintering shrinkage and has compact sliver film structure.

Description

technical field [0001] The invention relates to a solar cell front silver paste, in particular to a solar cell front silver paste suitable for low temperature sintering. Background technique [0002] A solar cell is a semiconductor device that converts solar energy into electricity. Structurally, it includes a back electrode, a pn junction, an anti-reflection film and a front electrode. Among them, the front electrode is used to receive light-excited electrons and output current to the outside. The quality of the front silver paste used to make the front electrode of the solar cell directly affects the series resistance of the solar cell and the photoelectric conversion efficiency of the cell, which constitutes a key technical point in the production of the solar cell. [0003] At present, the peak sintering temperature of the front silver paste for solar cells is 750-830°C. The high sintering temperature indirectly requires that the back silver paste and the back aluminum...

Claims

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Application Information

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IPC IPC(8): H01B1/22H01L31/0224
Inventor 戈士勇
Owner JIANGSU RUIDE NEW ENERGY TECH
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