Light attenuation resistant PERC single crystalline silicon solar cell aluminum paste and preparation method thereof

A technology of solar cells and monocrystalline silicon, which is applied in the manufacture of cables/conductors, conductive materials dispersed in non-conductive inorganic materials, circuits, etc. Reduce the photoelectric conversion efficiency and other problems to achieve the effect of reducing the light attenuation range, improving the photoelectric conversion efficiency, and enhancing the gettering effect

Active Publication Date: 2018-11-23
JIANGXI NUCLEAR IND XINGZHONG NEW MATERIALS
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the doped boron source will form a boron-oxygen complex with oxygen in the silicon wafer under the condition of light irradiation or current injection, so the doped boron source will instead increase the probability of boron-oxygen complex formation and reduce the minority carrier lifetime. increase, and the gettering effect of the boron source on a very small amount of metal impurity elements is relatively weak, resulting in an increase in the attenuation of the photoelectric conversion efficiency and reducing the stability of the photoelectric performance of the cell
At the same time, it is difficult for conventional aluminum paste to fully fill the slots, and cannot form ohmic contact with the silicon layer under the back passivation layer, which reduces the photoelectric conversion efficiency

Method used

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  • Light attenuation resistant PERC single crystalline silicon solar cell aluminum paste and preparation method thereof

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Effect test

Embodiment 1

[0019] An anti-light fading aluminum paste for PERC monocrystalline silicon solar cells, the aluminum paste is made of the following components in proportion by mass: 75 parts of aluminum powder, 1.5 parts of inorganic binder, 22.5 parts of organic binder, 1 part of inorganic additives.

[0020] The inorganic auxiliary agent is indium powder with an average particle size of 2 μm and a tap density of 3.2 g / cm 3 , the specific surface area is 1.1m 2 / g.

[0021] The aluminum powder is spherical, with an average particle size of 8.6 μm and a tap density of 2.4 g / cm 3 , the specific surface area is 1.6m 2 / g.

[0022] The organic binder is composed of 35 parts of alcohol ester twelve parts by mass, 25 parts of terpineol, 14 parts of castor oil, 12 parts of tributyl citrate, 7 parts of ethyl cellulose, 4 parts of polyamide Wax, prepared from 3 parts polyether phosphate.

[0023] Described inorganic binder is 1 part of SiO by mass parts proportioning 2 , 30 parts BaCO 3 , 12...

Embodiment 2

[0029] An anti-light fading aluminum paste for PERC monocrystalline silicon solar cells, the aluminum paste is made of the following components in proportion by mass: 78 parts of aluminum powder, 1 part of inorganic binder, 19.5 parts of organic binder, 1.5 parts of inorganic additives.

[0030] The inorganic auxiliary agent is indium oxide powder with an average particle size of 1.3 μm and a tap density of 2.1 g / cm 3 , the specific surface area is 1.8m 2 / g.

[0031] The aluminum powder is spherical, with an average particle size of 9.2 μm and a tap density of 2.8 g / cm 3 , with a specific surface area of ​​1.3m 2 / g.

[0032] The organic binder is composed of 39 parts of alcohol ester twelve parts by mass, 26 parts of terpineol, 10 parts of castor oil, 10 parts of tributyl citrate, 5 parts of ethyl cellulose, 4 parts of polyamide Wax, prepared from 6 parts polyether phosphate.

[0033] Described inorganic binder is 1 part of SiO by mass parts proportioning 2 , 26 parts B...

Embodiment 3

[0039] An anti-light fading aluminum paste for PERC monocrystalline silicon solar cells, the aluminum paste is made of the following components in proportion by mass: 80 parts of aluminum powder, 1.5 parts of inorganic binder, 18 parts of organic binder, 0.5 parts of inorganic additives.

[0040] The inorganic auxiliary agent is indium powder with an average particle size of 0.4 μm and a tap density of 1.5 g / cm 3 , the specific surface area is 2.3m 2 / g.

[0041] The aluminum powder is spherical, with an average particle size of 10 μm and a tap density of 3.3 g / cm 3 , the specific surface area is 0.9m 2 / g.

[0042] The organic binder is composed of 32 parts of alcohol ester twelve parts by mass, 15 parts of terpineol, 15 parts of castor oil, 15 parts of tributyl citrate, 10 parts of ethyl cellulose, and 8 parts of polyamide Wax, prepared from 5 parts polyether phosphate.

[0043] Described inorganic binder is 4 parts of SiO by mass parts proportioning 2 , 15 parts BaCO...

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Abstract

The invention discloses a light attenuation resistant PERC single crystalline silicon solar cell aluminum paste. The aluminum paste is prepared from the following components in parts by weight: 70 to86 parts of aluminum powder, 0.5 to 2.5 parts of an inorganic binder, 10 to 24 parts of an organic binder and 0.1 to 1.5 parts of an inorganic auxiliary agent. The invention also discloses a preparation method of the aluminum paste. The preparation method comprises the following steps: firstly uniformly stirring the organic binder and the inorganic auxiliary agent, then adding the inorganic binderand the aluminum powder in sequence to be stirred uniformly, and finally grinding to obtain the aluminum paste. An PERC single crystalline silicon solar cell obtained by using the aluminum paste hasthe characteristics of high photovoltaic conversion efficiency and light attenuation resistance.

Description

technical field [0001] The invention belongs to the technical field of aluminum paste for PERC monocrystalline silicon solar cell electrodes, and in particular relates to an anti-light decay PERC monocrystalline silicon solar cell aluminum paste and a preparation method thereof. Background technique [0002] In order to reduce the cost of crystalline silicon solar cells and improve the photoelectric efficiency, the thickness of the silicon wafer is reduced to reduce the amount of silicon used, but when the diffusion length of the minority carriers is greater than the thickness of the silicon wafer, the recombination rate of the upper and lower surfaces of the silicon wafer It has a great influence on the photoelectric efficiency. PERC crystalline silicon solar cells usually deposit a dielectric passivation layer on both the upper and lower surfaces of the silicon wafer. The back passivation layer has the functions of reducing carrier surface recombination, anti-reflection an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/16H01B1/22H01B13/00H01L31/0224
CPCH01B1/16H01B1/22H01B13/00H01L31/022425
Inventor 胡昌文彭帅邹文樊浩晟毕北鸿
Owner JIANGXI NUCLEAR IND XINGZHONG NEW MATERIALS
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