Aluminum paste for solar energy battery and preparation method thereof

A technology of solar cells and aluminum paste, applied in the manufacture of cables/conductors, conductive materials dispersed in non-conductive inorganic materials, circuits, etc., can solve problems affecting the uniformity of aluminum powder distribution, increasing contact resistance, cracks, etc. , to achieve strong adhesion, low ohmic contact resistance, dense and uniform electrodes

Active Publication Date: 2012-07-18
JIANGSU RUIDE NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In addition, the particle size of the aluminum powder used in the existing aluminum paste is basically the same, so if the particle size of the aluminum powder is too large, cracks will appear in screen printing, a

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] The invention relates to an aluminum paste for solar cells, the aluminum paste comprises: 65wt% of aluminum powder, 10wt% of copper powder, 10wt% of lead-free glass powder, 15wt% of organic vehicle, the organic vehicle is composed of organic Composed of a solvent and an organic additive, the weight ratio between the two is 4:1, the aluminum powder is spherical, the particle size of the aluminum powder includes two types of 1 μm and 3 μm, and the particle size of the copper powder is 3 μm; Described organic solvent comprises any one or their combination in terpineol, turpentine, butyl carbitol, dibutyl phthalate, plasticizer and tensio-active agent; Described organic additive is cellulose; So Described lead-free glass powder adopts lanthanum, boron, zinc glass system, and its component comprises: the La of 1wt% 2 o 3 , 70wt% B 2 o 3 , 5wt% Al 2 o 3 , 5wt% ZnO, 5wt% Na 2 O, 5 wt% Li 2 O, 8 wt% V 2 o 5 and 1wt% P 2 o 5 . Among the aluminum powders, those with a...

Embodiment 2

[0029]The invention relates to an aluminum paste for solar cells, the aluminum paste comprises: 75wt% of aluminum powder, 5wt% of copper powder, 10wt% of lead-free glass powder, 10wt% of organic vehicle, the organic vehicle is composed of organic Solvent and organic additives, the weight ratio between the two is 6:1, the aluminum powder is spherical, the particle size of the aluminum powder includes two kinds of 2 μm and 6 μm, and the particle size of the copper powder is 4 μm; Described organic solvent comprises any one or their combination in terpineol, turpentine, butyl carbitol, didecyl phthalate, plasticizer and surfactant; Described organic additive is cellulose; The lead-free glass powder adopts lanthanum, boron and zinc glass system, and its components include: 0.5wt% La 2 o 3 , 80wt% B 2 o 3 , 3wt% Al 2 o 3 , 2wt% ZnO, 3wt% Na 2 O, 2wt% Li 2 O, 4 wt% V 2 o 5 and 0.5wt% P 2 o 5 . Among the aluminum powders, those with a particle size of 2 μm accounted for a...

Embodiment 3

[0036] The invention relates to an aluminum paste for solar cells, the aluminum paste comprises: 70wt% aluminum powder, 7wt% copper-aluminum powder, 8wt% lead-free glass powder, 15wt% organic vehicle, the organic vehicle consists of Composed of an organic solvent and an organic additive, the weight ratio between the two is 5:1, the aluminum powder is spherical, the particle size of the aluminum powder includes two kinds of 1.5 μm and 4 μm, and the particle size of the copper powder is 5 μm; described organic solvent comprises any one or their combination in terpineol, turpentine, butyl carbitol, dioctyl phthalates, plasticizer and tensio-active agent; Described organic additive is Cellulose; described lead-free glass powder adopts lanthanum, boron, zinc glass system, and its component comprises: the La of 0.5wt% 2 o 3 , 75wt% B 2 o 3 , 5wt% Al 2 o 3 , 5wt% ZnO, 3wt% Na 2 O, 2wt% Li 2 O, 4 wt% V 2 o 5 and 0.5wt% P 2 o 5 . Among the aluminum powders, those with a par...

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Abstract

The invention discloses an aluminum paste for a solar energy battery. The aluminum paste for solar energy battery comprises an aluminum powder, a copper powder, a non-leaded glass powder and organic carriers, wherein the organic carriers are composed of organic solvents and organic addition agents, the aluminum powder is of sphere and /or of squamelliform, the aluminum powder has thick grains andthin grains; and the non-leaded glass powder adopts the glass system of lanthanum, boron and zinc. The preparation method includes uniformly mixing the raw materials of the non-leaded glass powder, subjecting the powder to heating and thermal insulation in a high temperature muffle furnace, then quenching the melted glass powder grains and grinding the grains; mixing and uniformly stirring the organic solvents and organic addition agents in proportion; weighing the aluminum powder, the copper powder, the non-leaded glass powder and the organic carriers, uniformly stirring the mixture in a container, then subjecting the mixture to grinding in a three-roll grinder and finally obtaining the uniform aluminum paste for the solar energy battery. On the premise of meeting the requirement of electrical properties of the solar energy battery, the requirement of non-leaded environmental protection can also be met.

Description

technical field [0001] The invention relates to an aluminum paste, in particular to an aluminum paste used for solar cells and a preparation method thereof. Background technique [0002] In the production process of silicon solar cells, the fabrication of the back electrode is a very important process. After the metal aluminum paste of the back electrode is screen-printed and rapidly heat-treated in a tunnel furnace, an aluminum back field can be formed on the back-side of the silicon wafer of the solar cell to increase the open circuit voltage. At the same time, the silicon-aluminum alloy formed during the sintering process can eliminate The Schottky barrier between electrodes realizes good ohmic contact, thereby improving the conversion efficiency of solar cells. This process eliminates the expensive microfabrication process required to form the P+ region in the traditional process, making mass production of solar cells possible. The structure of silicon solar cells is g...

Claims

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Application Information

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IPC IPC(8): H01B1/16H01B1/22H01B13/00H01L31/0224
Inventor 戈士勇
Owner JIANGSU RUIDE NEW ENERGY TECH
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