Solar cell back electric field aluminium paste and preparation method thereof

A technology of solar cells and back electric field, applied in the field of solar cells, can solve the problems of slurry leakage and clogging of the screen, and achieve the effect of improving the photoelectric conversion efficiency.

Active Publication Date: 2011-08-03
BYD CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] In order to solve the technical problem of slurry leaking through the screen and blocking the screen during the screen printing process, the present invention firstly provides a solar cell back electric field aluminum paste, which includes 70-85wt% aluminum paste based on the total weight of the conductive paste. Powder, 0.2-10wt% of glass powder, 10-30wt% of organic vehicle; organic vehicle includes thickener, micronized wax, tributyl phosphate and organic solvent, based on the total weight of organic vehicle, micronized wax accounts for 0.5-3.0 wt%, tributyl phosphate accounted for 0.2 ~ 5wt%

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] 1. Preparation of Glass Powder

[0042] 70 parts by weight of bismuth oxide (Bi 2 o 3 ), 15 parts by weight of boron trioxide (B 2 o 3 ), 8 parts by weight of silicon dioxide (SiO 2 ), 4.5 parts by weight of alumina (Al 2 o 3 ), 2.5 parts by weight of zinc oxide (ZnO) were added to a V-type mixer (V-20 type, Taizhou Liming Pharmaceutical Machinery Co., Ltd.) and mixed evenly. Take it out, put it into a porcelain crucible, then put it into a silicon carbide rod furnace, raise the temperature to preheat to 550°C, keep it warm for 0.5 hours, then raise it to 1250°C, and melt for 0.5 hours. Take out, quench in water, and then filter to obtain coarse glass frit. Put the obtained coarse glass frit into a ball mill jar, control the ratio of zirconia balls: glass beads: deionized water = 2:1:0.5, and mill at a speed of 100 r / min for 55 hours. After ball milling, take it out, filter and dry to get the average particle size D 50 玻璃 = 10 μm glass frit.

[0043] 2. Prepa...

Embodiment 2

[0052] According to the method of Example 1, aluminum paste S2 was obtained. The difference is:

[0053] At 45°C, 10 parts by weight of polyamide fine powder wax was dissolved in 90 parts by weight of organic solvent, and stirred for 30 minutes to obtain a colorless transparent gel.

[0054] Dissolve 10 parts by weight of ethyl cellulose, 15 parts by weight of gel, and 1 part by weight of tributyl phosphate in 74 parts by weight of an organic solvent at 70° C., fully dissolve and then cool to obtain a transparent and uniform organic carrier. Wherein, the weight percentages of polyamide micropowder wax and tributyl phosphate are respectively 1.5wt% and 1wt%, and the ratio of weight percentage is polyamide micropowder wax: tributyl phosphate=1.5:1.

Embodiment 3

[0056] According to the method of Example 2, aluminum paste S3 was obtained. The difference is:

[0057] 10 parts by weight of ethyl cellulose, 30 parts by weight of gel, and 1 part by weight of tributyl phosphate were dissolved in 59 parts by weight of an organic solvent to obtain an organic vehicle. Wherein, the weight percentages of polyamide micropowder wax and tributyl phosphate are respectively 3wt% and 1wt%, and the ratio of weight percentage is polyamide micropowder wax: tributyl phosphate=3:1.

[0058] The viscosity of aluminum paste S4 is relatively high, and it is not easy to evenly coat the screen.

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Abstract

The invention provides a solar cell back electric field aluminium paste comprising the following components in percentage by weight based on the total mass of a conductive paste: 70-85% of aluminite powder, 0.2-10% of glass powder and 10-30% of organic carrier. The solar cell back electric field aluminium paste is characterized in that the organic carrier comprises a thickening agent, micro powder wax, tributyl phosphate and an organic solvent; and micro powder wax accounts for 0.5-3.0wt% and tributyl phosphate accounts for 0.2-5wt% by taking the total mass of the organic carrier as a reference. By utilizing the solar cell back electric field aluminium paste and the preparation method thereof, the technical problems of screen leakage and blockage in the screen printing process can be solved. In addition, the photoelectric conversion rate of a crystalline silicon solar cell can be improved.

Description

technical field [0001] The invention belongs to the field of solar cells, in particular to a silicon solar cell back electric field aluminum paste and a preparation method thereof. Background technique [0002] Increasing the back electric field on the back of the solar cell is an effective way to improve the efficiency of the cell. For example, in a battery with p-type materials, a layer of p is added to the back + Densely doped layer, forming p + -p structure, then in p + The -p interface generates a point from the p area to p + built-in electric field. Due to the accumulation of photogenerated carriers separated by this built-in electric field, a p + terminal is positive and p-terminal is negative photoelectromotive force, which has the same polarity as the photoelectromotive force at both ends of the battery P-N junction, thereby increasing the open circuit voltage V oc . In addition, due to the existence of the back electric field, the photogenerated carriers are...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01L31/0224H01L31/18H01B1/16H01B1/22H01B13/00
CPCY02P70/50
Inventor 谭伟华刘珍陈东锋周勇姜占锋
Owner BYD CO LTD
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