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Low-warpage rear aluminum paste used for crystalline silicon solar cell

A solar cell, low warpage technology, applied in the field of solar cells, can solve the problems of reducing the degree of warpage, limited space, etc., and achieve the effect of small expansion coefficient

Active Publication Date: 2016-11-23
NANTONG T SUN NEW ENERGY CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method has limited space through the expansion of fine aluminum powder, so the degree of warpage reduction is limited

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1) Aluminum powder: nano-aluminum fiber, the oxidation number is 0.6%.

[0026] 2) Glass powder: particle size D50 = 10μm.

[0027] 3) Organic carrier: 7.5 parts by mass of ethyl cellulose, 8 parts of nitrocellulose, 2.5 parts of polyamide modified phenolic resin, 4 parts of epoxy modified phenolic resin, 39 parts of terpineol, 3 parts of carbitol Parts, 36 parts of ethylene glycol.

[0028] 4) Mix 85 parts of aluminum powder, 0.4 parts of glass powder, 13 parts of organic vehicle, and 1.6 parts of additives in parts by mass, and then use a three-roll mill to grind and disperse until the fineness is < 20 μm and the viscosity is 15 Pa. S, with a printed wet weight of 1.0 g, a low-warpage all-aluminum back field with a square resistance < 60 mΩ / □ was obtained.

Embodiment 2

[0030] 1) Aluminum powder: nano-aluminum fiber, the oxidation number is 0.6%.

[0031] 2) Glass powder: particle size D50 = 14μm.

[0032] 3) Organic carrier: 10 parts by mass of ethyl cellulose, 6 parts of nitrocellulose, 1 part of polyamide modified phenolic resin, 6 parts of epoxy modified phenolic resin, 40 parts of terpineol, 10 parts of carbitol Parts, 28 parts of ethylene glycol.

[0033] 4) Mix 95 parts of aluminum powder, 0.4 parts of glass powder, 4 parts of organic vehicle, and 0.6 parts of additives in parts by mass, and then use a three-roll mill to grind and disperse until the fineness is < 20 μm and the viscosity is 10 Pa. S, with a printed wet weight of 1.0 g, a low-warpage all-aluminum back field with a square resistance < 60 mΩ / □ was obtained.

Embodiment 3

[0035] 1) Aluminum powder: nano-aluminum fiber, the oxidation number is 0.7%.

[0036] 2) Glass powder: particle size D50 = 15μm.

[0037] 3) Organic carrier: 10 parts by mass of ethyl cellulose, 3 parts of nitrocellulose, 1.5 parts of polyamide modified phenolic resin, 7 parts of epoxy modified phenolic resin, 45 parts of terpineol, 8.5 parts of carbitol Parts, 25 parts of ethylene glycol.

[0038] 4) Mix 92 parts of aluminum powder, 0.5 parts of glass powder, 6 parts of organic vehicle, and 1.5 parts of additives in parts by mass, and then use a three-roll mill to grind and disperse until the fineness is < 20 μm and the viscosity is 14 Pa. S, with a printed wet weight of 1.0 g, a low-warpage all-aluminum back field with a square resistance < 60 mΩ / □ was obtained.

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PUM

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Abstract

The invention discloses a low-warpage rear aluminum paste used for a crystalline silicon solar cell. The paste is prepared from the following raw materials in parts by weight: 85-95 parts of aluminum powder, 0.1-0.5 part of glass powder, 4-13 parts of organic carrier and 0.6-2 parts of additive. The glass powder with large particle sizes can be used for effectively lowering the coefficient of expansion of the aluminum paste. In addition, the content of the aluminum powder in a slurry formula is high, and the content of aluminum in a back surface field is guaranteed while the printing wet weight of the aluminum paste is reduced so as to achieve a purpose of lowering a silicon wafer warpage value but avoiding affecting battery performance.

Description

technical field [0001] The invention belongs to the field of solar cells, and in particular relates to a low-warp back aluminum paste for crystalline silicon solar cells. Background technique [0002] Silicon solar cell is a device that directly converts sunlight energy into electrical energy due to the photovoltaic effect. Aluminum paste for silicon solar cell is the main component of solar electronic paste. In the manufacturing process of solar cells, the aluminum paste is usually printed on the back of the silicon wafer by screen printing, and the aluminum is diffused into the silicon body through drying, sintering, cooling and other processes to form heavily doped P + The layer is the back electric field. Under the action of the back electric field, electrons are pushed away from the back surface, thereby reducing the recombination of electrons and holes during the diffusion process, thereby increasing the open circuit voltage. In addition, the aluminum powder forms a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01L31/0224
CPCH01B1/22H01L31/022425Y02E10/50H01B1/023H01L31/0224H01L31/022441
Inventor 朱鹏
Owner NANTONG T SUN NEW ENERGY CO LTD