Lead-free glass powder for aluminum back field of silicon solar battery and preparation method thereof

A silicon solar cell and lead-free glass powder technology, which is applied in the field of crystalline silicon solar cells, can solve the problems of battery sheet electrical performance decline, ash adhesion drop, glass floating, etc., to achieve increased stability, good corrosion effect, and easy flow Effect

Active Publication Date: 2014-07-30
JIANGSU ZHENGNENG ELECTRONICS TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the aluminum paste sintering process, the glass density is not suitable, which will cause the glass to float up, increase the resistance of the cell, and affect the electrical performance of the cell
If the softening point of the glass is too low, the adhesion of sintering ash will decrease, or the phenomenon of aluminum beads will lead to a decrease in the electrical performance of the cell.
If the softening point is too high, the slurry is not fully "cooked", and the electrical properties and adhesion will be affected

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] The preparation method of the lead-free glass powder for the aluminum back field of silicon solar cells comprises the following steps in turn: according to the mass composition ratio of each component, the components with the following mass proportions are weighed respectively, Bi 2 o 3 50 copies, B 2 o 3 17.5 parts, SiO 2 18 parts, ZnO 7 parts, P 2 o 5 1 part, BaO 0.5 part, CaO 0.5 part, MoO 3 0.5 servings.

[0017] Put it into a mixer and mix it thoroughly, then transfer it into a crucible, then put the crucible into a box furnace at 1200°C, keep it warm for 100 minutes, then pour the molten glass into deionized cold water to quench, and put the quenched glass into In the ball mill, the volume ratio of ball: material: water is 1:1:2, ball mill for 12 hours, pass through a 400-mesh screen, dry, and finally transfer the glass powder into a box furnace for annealing at 500°C to obtain the particle size Glass powder for solar back silver electrodes less than ...

Embodiment 2

[0020] The preparation method of lead-free glass powder for aluminum back field of silicon solar cell comprises the following steps successively: according to the mass component distribution ratio of each component, weigh the components of the following mass proportion respectively, Bi 2 o 3 50 copies, B 2 o 3 29 parts, SiO 2 10 parts, ZnO 10 parts, P 2 o 5 3 parts, BaO 2 parts, CaO 2 parts, MoO 3 2 servings.

[0021]Put it into a mixer and mix it thoroughly, then transfer it to a crucible, then put the crucible into a box furnace at 1050°C, keep it warm for 150 minutes, and then pour the molten glass into deionized cold water for quenching, and put the quenched glass into In the ball mill, the volume ratio of ball: material: water is 1:1:2, ball mill for 11 hours, pass through a 400-mesh screen, dry, and finally transfer the glass powder into a box furnace for annealing at 425°C to obtain the particle size Glass powder for solar back silver electrodes less tha...

Embodiment 3

[0024] The preparation method of the lead-free glass powder for the aluminum back field of silicon solar cells comprises the following steps in turn: according to the mass composition ratio of each component, the components with the following mass proportions are weighed respectively, Bi 2 o 3 50 copies, B 2 o 3 16.7 parts, SiO 2 15 parts, ZnO 7 parts, P 2 o 5 6 parts, BaO 3 parts, CaO 3 parts, MoO 3 1.3 parts. Put it into a mixer and mix it thoroughly, then transfer it to a crucible, then put the crucible into a box furnace at 900°C, heat and melt for 200 minutes, then pour the molten glass into deionized cold water and quench it. Put the glass into a ball mill, in which the volume ratio of ball: material: water is 1:1:2, ball mill for 10 hours, pass through a 400-mesh screen, dry, and finally transfer the glass powder into a box furnace for annealing at 350°C. The glass frit for solar back silver electrode with particle size less than 7 μm is obtained. The so...

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Abstract

The invention relates to the technical field of solar batteries, and relates to lead-free glass powder for the aluminum back field of a silicon solar battery. The lead-free glass powder comprises the following components in parts by weight: 40-65 parts of Bi2O3, 15-35 parts of B2O3, 10-20 parts of SiO2, 3-10 parts of ZnO, 1-10 parts of P2O5, 0.5-5 parts of BaO, 0.5-5 parts of CaO and 0.5-2 parts of MoO3; the expansion coefficient of the binding phase of the glass powder is (35-50)*10<-7>, the softening point of the glass powder is 520-600 DEG C, the sintering temperature of the glass powder is 750-950 DEG C, and the density of the glass powder is 2-4 g / cm<3>. According to the lead-free glass powder disclosed by the invention, the glass powder for the aluminum back field is matched with the expansion coefficient, softening point and density of a battery silicon slice, and therefore the aluminum slurry has the advantages of small bending deformation obtained after sintering, high adhesive force with the silicon slice and good conductive property.

Description

technical field [0001] The invention relates to the technical field of crystalline silicon solar cells, in particular to a lead-free glass powder for an aluminum back field of a silicon solar cell and a preparation method thereof. Background technique [0002] Silicon solar cell is a device that directly converts solar energy into electrical energy by using the photoelectric effect, and has developed rapidly in recent years. Aluminum paste for silicon solar cells is the main component of solar electronic pastes, used to form the back surface field of silicon solar cells, and also used as the back electrode of solar cells. Aluminum paste for silicon solar cells mainly consists of binder phase glass powder, functional phase aluminum powder, organic vehicle and modifier. Aluminum powder is used as the functional phase in the aluminum electrode paste, glass is used as the binding phase, and they are uniformly dispersed in the organic vehicle. After sintering, the aluminum powd...

Claims

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Application Information

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IPC IPC(8): C03C12/00C03C8/24
Inventor 张群李鹏
Owner JIANGSU ZHENGNENG ELECTRONICS TECH CO LTD
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