Crystalline silicon solar cell back surface field aluminum paste and preparation method thereof

Abstract

The invention relates to crystalline silicon solar cell back surface field aluminum paste and a preparation method thereof. The crystalline silicon solar cell back surface field aluminum paste comprises, by weight, 74 parts of aluminum powder, 20-25 parts of organic bonds, 1-4 parts of lead-free glass powder and 0.1-2 parts of additives, wherein the organic bond comprises, by weight, 40-70 parts of terpineol, 5-10 parts of butyl carbitol, 5-10 parts of butyl carbitol acetic ester, 3-10 parts of ethyl cellulose, 5-15 parts of dibutyl phthalate and one part of sorbitol anhydride stearate; the lead-free powder comprises, by weight, 30-60 parts of Bi2O3, 5-15 parts of B2O3, 3 parts of BiF3, 10-20 parts of SiO2, 5-10 parts of ZnO, 1-5 parts of TiO2, 10-20 parts of Al2O3 and 1-3 parts of P2O5; and the additive is spherical copper powder with the purity larger than 99% and the fineness being 20000 meshes. The aluminum powder, the organic bonds, the lead-free glass powder and the additives are evenly mixed and then rolled by a three-roll grinder until the fineness is smaller than or equal to 10 mum and the viscosity is 30-60Pa*s. The crystalline silicon solar cell back surface field aluminum paste is high in photoelectric conversion efficiency and adhesive force, the adhesive force conversion efficiency after high temperature aging declines, and the water-boiling resistance is good.

Description

technical field

[0001] The invention relates to an electronic paste for a crystalline silicon solar cell, in particular to a back field aluminum paste of a crystalline silicon solar cell, and a method for preparing the back field aluminum paste of a crystalline silicon solar cell, belonging to the technical field of solar cells. Background technique

[0002] With the development of photovoltaic technology, the thickness of crystalline silicon wafers, the raw material of solar cells, has gradually decreased, while the conversion efficiency of photovoltaics has become higher and higher. In order to meet the technical needs of battery cells, higher requirements are put forward for the back field aluminum paste, one of the raw materials. At present, the existing products in the market have been upgraded from the early lead-containing products to lead-free products, which have little impact on the human body and the environment. However, with the development of technology, these ...

Examples

Embodiment 1

[0025] The preparation method of the back-field aluminum paste of crystalline silicon solar cells includes the following steps in turn: (1) Prepare raw materials according to the following components and weight content, 74 parts of aluminum powder, 20 parts of organic binder, 1 part of lead-free glass powder and additives 0.1 part; the aluminum powder has a purity > 99%, an average particle diameter of 2 μm, a tap density of 1 g / cm3, and a spherical shape; the raw material components and weight content of the organic binder are as follows: terpineol 40 parts, 5 parts of butyl carbitol, 5 parts of butyl carbitol acetate, 3 parts of ethyl cellulose, 5 parts of dibutyl phthalate and 1 part of sorbitan stearate; The raw material composition and weight content of lead-free glass powder are as follows, Bi 2 o 3 : 30 copies, B 2 o3 : 5 copies, BiF 3 : 3 parts, SiO 2 : 10 parts, ZnO: 5 parts, TiO 2 : 1 part, Al 2 o 3 : 10 copies, P 2 o 5 : 1 copy;

[0026] (2) Preparation of...

Embodiment 2

[0033] The preparation method of the back field aluminum paste of crystalline silicon solar cells includes the following steps in turn: (1) Prepare raw materials according to the following components and weight content, 74 parts of aluminum powder, 22 parts of organic binder, 2 parts of lead-free glass powder and additives 1 part; the aluminum powder has a purity > 99%, an average particle size of 4 μm, a tap density of 1.5 g / cm3, and a spherical shape; the raw material components and weight content of the organic adhesive are as follows: pine oil 55 parts of alcohol, 8 parts of butyl carbitol, 7 parts of butyl carbitol acetate, 6 parts of ethyl cellulose, 10 parts of dibutyl phthalate and 1 part of sorbitan stearate; The raw material composition and weight content of described lead-free glass powder are as follows, Bi 2 o 3 : 45 copies, B 2 o 3 : 10 copies, BiF 3 : 3 parts, SiO 2 : 15 parts, ZnO: 8 parts, TiO 2 : 3 parts, Al 2 o 3 : 15 copies, P 2 o 5 : 2 copies;

...

Embodiment 3

[0041] The preparation method of the back-field aluminum paste of crystalline silicon solar cells includes the following steps in turn: (1) Prepare raw materials according to the following components and weight content, 74 parts of aluminum powder, 25 parts of organic binder, 4 parts of lead-free glass powder and additives 2 parts; the aluminum powder has a purity > 99%, an average particle size of 6 μm, a tap density of 2 g / cm3, and a spherical shape; the raw material components and weight content of the organic binder are as follows: terpineol 70 parts, 10 parts of butyl carbitol, 10 parts of butyl carbitol acetate, 10 parts of ethyl cellulose, 15 parts of dibutyl phthalate and 1 part of sorbitan stearate; The raw material composition and weight content of lead-free glass powder are as follows, Bi 2 o 3 : 60 copies, B 2 o 3 : 15 copies, BiF 3 : 3 parts, SiO 2 : 20 parts, ZnO: 10 parts, TiO 2 : 5 parts, Al 2 o 3 : 20 copies, P 2 o 5 :3 copies;

[0042] (2) Preparat...

technical field

[0001] The invention relates to an electronic paste for a crystalline silicon solar cell, in particular to a back field aluminum paste of a crystalline silicon solar cell, and a method for preparing the back field aluminum paste of a crystalline silicon solar cell, belonging to the technical field of solar cells. Background technique

[0002] With the development of photovoltaic technology, the thickness of crystalline silicon wafers, the raw material of solar cells, has gradually decreased, while the conversion efficiency of photovoltaics has become higher and higher. In order to meet the technical needs of battery cells, higher requirements are put forward for the back field aluminum paste, one of the raw materials. At present, the existing products in the market have been upgraded from the early lead-containing products to lead-free products, which have little impact on the human body and the environment. However, with the development of technology, these ...

Examples

Embodiment 1

[0025] The preparation method of the back-field aluminum paste of crystalline silicon solar cells includes the following steps in turn: (1) Prepare raw materials according to the following components and weight content, 74 parts of aluminum powder, 20 parts of organic binder, 1 part of lead-free glass powder and additives 0.1 part; the aluminum powder has a purity > 99%, an average particle diameter of 2 μm, a tap density of 1 g / cm3, and a spherical shape; the raw material components and weight content of the organic binder are as follows: terpineol 40 parts, 5 parts of butyl carbitol, 5 parts of butyl carbitol acetate, 3 parts of ethyl cellulose, 5 parts of dibutyl phthalate and 1 part of sorbitan stearate; The raw material composition and weight content of lead-free glass powder are as follows, Bi 2 o 3 : 30 copies, B 2 o3 : 5 copies, BiF 3 : 3 parts, SiO 2 : 10 parts, ZnO: 5 parts, TiO 2 : 1 part, Al 2 o 3 : 10 copies, P 2 o 5 : 1 copy;

[0026] (2) Preparation of...

Embodiment 2

[0033] The preparation method of the back field aluminum paste of crystalline silicon solar cells includes the following steps in turn: (1) Prepare raw materials according to the following components and weight content, 74 parts of aluminum powder, 22 parts of organic binder, 2 parts of lead-free glass powder and additives 1 part; the aluminum powder has a purity > 99%, an average particle size of 4 μm, a tap density of 1.5 g / cm3, and a spherical shape; the raw material components and weight content of the organic adhesive are as follows: pine oil 55 parts of alcohol, 8 parts of butyl carbitol, 7 parts of butyl carbitol acetate, 6 parts of ethyl cellulose, 10 parts of dibutyl phthalate and 1 part of sorbitan stearate; The raw material composition and weight content of described lead-free glass powder are as follows, Bi 2 o 3 : 45 copies, B 2 o 3 : 10 copies, BiF 3 : 3 parts, SiO 2 : 15 parts, ZnO: 8 parts, TiO 2 : 3 parts, Al 2 o 3 : 15 copies, P 2 o 5 : 2 copies;

...

Embodiment 3

[0041] The preparation method of the back-field aluminum paste of crystalline silicon solar cells includes the following steps in turn: (1) Prepare raw materials according to the following components and weight content, 74 parts of aluminum powder, 25 parts of organic binder, 4 parts of lead-free glass powder and additives 2 parts; the aluminum powder has a purity > 99%, an average particle size of 6 μm, a tap density of 2 g / cm3, and a spherical shape; the raw material components and weight content of the organic binder are as follows: terpineol 70 parts, 10 parts of butyl carbitol, 10 parts of butyl carbitol acetate, 10 parts of ethyl cellulose, 15 parts of dibutyl phthalate and 1 part of sorbitan stearate; The raw material composition and weight content of lead-free glass powder are as follows, Bi 2 o 3 : 60 copies, B 2 o 3 : 15 copies, BiF 3 : 3 parts, SiO 2 : 20 parts, ZnO: 10 parts, TiO 2 : 5 parts, Al 2 o 3 : 20 copies, P 2 o 5 :3 copies;

[0042] (2) Preparat...