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Back surface field aluminium paste for solar cells

A solar cell and back field aluminum paste technology, applied in the field of metal pigments, can solve the problems of poor conductivity and low photoelectric conversion efficiency of aluminum paste, and achieve the effect of low warpage

Active Publication Date: 2011-06-15
长沙族兴新材料股份有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

It mainly solves the technical problems of poor conductivity and low photoelectric conversion efficiency of the existing aluminum paste for solar cells

Method used

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  • Back surface field aluminium paste for solar cells

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Experimental program
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Effect test

preparation example Construction

[0105] 2) Preparation of inorganic adhesive

[0106]Weigh the components of the inorganic adhesive according to the formula requirements, mix them in a high-speed mixer, then melt at 1150°C-1250°C, water quench, and ball mill. In the case of using binders with different particle sizes, glass frits with different particle sizes can be obtained by different grinding times. In a specific embodiment of the present invention, the rotating speed of the ball mill is set to 30-50rpm, the inorganic binder B with a D50 value of 2-4 microns is obtained after ball milling for 48 hours, and the D50 value of 1-2 microns is obtained after ball milling for 72 hours. Inorganic adhesive A between microns.

[0107] 3) Preparation of organic vehicle

[0108] Weigh the solvent and resin according to the formula requirements, stir and mix in the reaction kettle, usually at an elevated temperature, for example, at a temperature of 50-80°C, slowly add the required resin into the hot solvent, After...

Embodiment 1

[0111] Aluminum powder treatment: add 50kg of aluminum powder (KY523, KY445, KY456, and KY467 account for 25% each) purchased from Luxi County Jinyuan Powder Material Co., Ltd. into the high-speed mixer, and add it by atomization according to the required amount 3kg combined treatment solution. The joint treatment solution contains 0.3kg titanate (KR-201, ethyl diisostearyl titanate), 0.2kg borate (LD-100P, produced by Yangzhou Lida Resin Co., Ltd.) and 2.5kg ethanol, titanium The ratio of ester to borate is 3 to 2, and the dosage is 1% of the aluminum powder. After adding the liquid, continue mixing for 3 minutes, take out the aluminum powder, place it at 50-70° C., and dry it under vacuum conditions for 6-8 hours to obtain the aluminum powder required for preparing the slurry.

[0112] Preparation of inorganic binder: according to 20 parts of SiO 2 , 18 copies of B 2 o 3 , 13 Al 2 o 3 , 15 Bi 2 o 3 , 16 parts of ZrO 2 Prepare the adhesive with the ratio of 10 parts ...

Embodiment 2

[0119] Treatment of aluminum powder: Add 50kg of aluminum powder (KY523, KY445, KY456, and KY467 each account for 25%) purchased from Luxi Jinyuan Powder Material Co., Ltd. into the high-speed mixer, and atomize according to the required amount Add 5kg of combined treatment solution. The joint treatment liquid contains 0.2kg titanate KR-201, 0.3kg borate (LD-100P, produced by Yangzhou Lida Resin Co., Ltd.) and 4.5kg ethanol, the ratio of titanate and borate is 2 to 3 , the dosage is 1% of the aluminum powder. After adding the liquid, continue mixing for 3 minutes, take out the aluminum powder, place it at 50-70° C., and dry it under vacuum conditions for 6-8 hours to obtain the aluminum powder required for preparing the slurry.

[0120] Preparation of inorganic adhesive: prepare adhesive according to the following ratio:

[0121] Bi 2 o 3 55 copies

[0122] SiO 2 15 copies

[0123] h 3 BO 3 20 copies

[0124] ZnO 5 parts

[0125] al 2 o 3 2 copies...

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Abstract

The invention relates to a back surface field aluminium paste for solar cells. The aluminium paste comprises the following components in parts by weight: 65-80 parts of aluminium powder, 1-5 parts of inorganic adhesive, 10-30 parts of organic carrier and 1-2 parts of modifier. Sintered films with lower warpage can be obtained through the back surface field aluminium paste.

Description

technical field [0001] The invention relates to the field of metal pigments, in particular to a back field aluminum paste for solar cells. Background technique [0002] The back field aluminum paste plays an important role in the manufacture of crystalline silicon solar cells. On the one hand, it passivates the back of the cell; The high and low junction improves the minority carrier lifetime; in addition, it can also increase the red light response. The open-circuit voltage, short-circuit current and fill factor of the cell are improved, thereby improving the conversion efficiency of the cell. [0003] The back field aluminum paste is a high temperature conductive paste, usually composed of conductive powder-aluminum powder, inorganic adhesive-glass powder, and organic vehicle-mainly solvents, organic resins and various additives. It is a paste material formed by mixing the above-mentioned components and repeatedly rolling them through a three-roll mill. After the slurry...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01L31/0224
Inventor 罗夔夏风苏力农梁晓斌
Owner 长沙族兴新材料股份有限公司
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