Back field aluminum paste applied to n-type crystalline silicon solar cells and preparation method thereof

Abstract

The invention discloses a back field aluminum paste applied to N-type crystalline silicon solar cells and a preparation method thereof, which consists of the following components in parts by weight: 65-85 parts of nitrogen atomized aluminum powder, 15 parts of organic binder ~30 parts, glass powder 0.5~3 parts, additives 0.5~3 parts, the nitrogen atomized aluminum powder is spherical aluminum powder median diameter D50: 1.0~2.5μm, D90: 2.25~5.0μm, span: 1.25~ 1.7, Aluminum powder is spherical aluminum powder with a content greater than 99.9%. The invention overcomes the attenuation problem of existing P-type crystalline silicon in ground applications, and provides a back field aluminum paste that can be used for aluminum back-emitter N-type solar cells, which can improve the minority carrier lifetime of crystalline silicon and reduce photoinduced Attenuation phenomenon. The composition ratio of the present invention is reasonable, the preparation process is simple, the adhesion between the prepared aluminum paste and the N-type substrate is strong, and the aluminum back field prepared by sintering has the advantages of high doping, good uniformity, water boiling resistance and low warpage, etc. Suitable for industrial production.

Description

technical field

[0001] The invention relates to a back field aluminum paste of a solar cell and a preparation method thereof, in particular to a back field aluminum paste of an N-type crystalline silicon solar cell and a preparation method thereof. Background technique

[0002] At present, crystalline silicon solar cells have long dominated the international photovoltaic market, and crystalline silicon solar cells are mainly divided into p-type substrates and n-type substrates according to substrate materials. Compared with p-type crystalline silicon, n-type crystalline silicon solar cells It has the following advantages: ① N-type crystalline silicon with the same resistivity has a longer minority carrier lifetime than P-type crystalline silicon. ②N-type crystalline silicon has a much higher tolerance to metal impurities than P-type crystalline silicon. ③The light-induced attenuation phenomenon of N-type crystalline silicon is better than that of P-type crystalline silicon ...

Examples

Embodiment 1

[0022] A back field aluminum paste applied to N-type crystalline silicon solar cells, which consists of the following components in parts by weight: 65 parts of nitrogen atomized aluminum powder, 15 parts of organic binder, 0.5 parts of glass powder, and 0.5 parts of additives parts, the composition and weight percentage of the organic binder are 20% high molecular polymer and 80% organic solvent. The composition and weight ratio of the organic solvent: terpineol: butyl carbitol: lecithin = 3:2:1. Auxiliaries include high-doping additives and corrosion-resistant additives. Among them, the high-doping additive is a silicon-aluminum-boron ternary alloy, and the silicon-aluminum-boron ternary alloy is composed of the following components in parts by weight: 0.5 parts of silicon, 75 parts of aluminum and 10 parts of boron.

[0023] A preparation method for a back field aluminum paste applied to an N-type crystalline silicon solar cell, comprising the following steps:

[0024] (1...

Embodiment 2

[0028] A back field aluminum paste applied to N-type crystalline silicon solar cells, which consists of the following components in parts by weight: 85 parts of nitrogen atomized aluminum powder, 30 parts of organic binder, 3 parts of glass powder, and 3 parts of additives parts, the composition and weight percentage of the organic binder are 40% high molecular polymer and 80% organic solvent.

[0029] The high molecular polymer is one or more of polyvinyl acetal resin, polyamide resin and ethyl cellulose; the composition and weight ratio of the organic solvent: terpineol: butyl carbitol: egg Phospholipids=3:2:1. Auxiliaries include high-doping additives and corrosion-resistant additives. The high-doping additive is a silicon-aluminum-boron ternary alloy, and the silicon-aluminum-boron ternary alloy is composed of the following components by weight: 3 parts of silicon, 85 parts of aluminum and 20 parts of boron.

[0030] A preparation method for a back field aluminum paste a...

Embodiment 3

[0035] A back field aluminum paste applied to N-type crystalline silicon solar cells, which consists of the following components in parts by weight: 80 parts of nitrogen atomized aluminum powder, 20 parts of organic binder, 2 parts of glass powder, and 2 parts of additives parts, the composition and weight percentage of the organic binder are 30% polymer and 70% organic solvent. The high molecular polymer is one or more of polyvinyl acetal resin, polyamide resin and ethyl cellulose; the composition and weight ratio of the organic solvent: terpineol: butyl carbitol: lecithin=3 :2:1, additives include high-doping additives and corrosion-resistant additives, high-doping additives are silicon-aluminum-boron ternary alloys, and silicon-aluminum-boron ternary alloys are composed of the following components in parts by weight: 1 part of silicon, 80 parts aluminum and 15 parts boron.

[0036] A preparation method for a back field aluminum paste applied to an N-type crystalline silico...

technical field

[0001] The invention relates to a back field aluminum paste of a solar cell and a preparation method thereof, in particular to a back field aluminum paste of an N-type crystalline silicon solar cell and a preparation method thereof. Background technique

[0002] At present, crystalline silicon solar cells have long dominated the international photovoltaic market, and crystalline silicon solar cells are mainly divided into p-type substrates and n-type substrates according to substrate materials. Compared with p-type crystalline silicon, n-type crystalline silicon solar cells It has the following advantages: ① N-type crystalline silicon with the same resistivity has a longer minority carrier lifetime than P-type crystalline silicon. ②N-type crystalline silicon has a much higher tolerance to metal impurities than P-type crystalline silicon. ③The light-induced attenuation phenomenon of N-type crystalline silicon is better than that of P-type crystalline silicon ...

Examples

Embodiment 1

[0022] A back field aluminum paste applied to N-type crystalline silicon solar cells, which consists of the following components in parts by weight: 65 parts of nitrogen atomized aluminum powder, 15 parts of organic binder, 0.5 parts of glass powder, and 0.5 parts of additives parts, the composition and weight percentage of the organic binder are 20% high molecular polymer and 80% organic solvent. The composition and weight ratio of the organic solvent: terpineol: butyl carbitol: lecithin = 3:2:1. Auxiliaries include high-doping additives and corrosion-resistant additives. Among them, the high-doping additive is a silicon-aluminum-boron ternary alloy, and the silicon-aluminum-boron ternary alloy is composed of the following components in parts by weight: 0.5 parts of silicon, 75 parts of aluminum and 10 parts of boron.

[0023] A preparation method for a back field aluminum paste applied to an N-type crystalline silicon solar cell, comprising the following steps:

[0024] (1...

Embodiment 2

[0028] A back field aluminum paste applied to N-type crystalline silicon solar cells, which consists of the following components in parts by weight: 85 parts of nitrogen atomized aluminum powder, 30 parts of organic binder, 3 parts of glass powder, and 3 parts of additives parts, the composition and weight percentage of the organic binder are 40% high molecular polymer and 80% organic solvent.

[0029] The high molecular polymer is one or more of polyvinyl acetal resin, polyamide resin and ethyl cellulose; the composition and weight ratio of the organic solvent: terpineol: butyl carbitol: egg Phospholipids=3:2:1. Auxiliaries include high-doping additives and corrosion-resistant additives. The high-doping additive is a silicon-aluminum-boron ternary alloy, and the silicon-aluminum-boron ternary alloy is composed of the following components by weight: 3 parts of silicon, 85 parts of aluminum and 20 parts of boron.

[0030] A preparation method for a back field aluminum paste a...

Embodiment 3

[0035] A back field aluminum paste applied to N-type crystalline silicon solar cells, which consists of the following components in parts by weight: 80 parts of nitrogen atomized aluminum powder, 20 parts of organic binder, 2 parts of glass powder, and 2 parts of additives parts, the composition and weight percentage of the organic binder are 30% polymer and 70% organic solvent. The high molecular polymer is one or more of polyvinyl acetal resin, polyamide resin and ethyl cellulose; the composition and weight ratio of the organic solvent: terpineol: butyl carbitol: lecithin=3 :2:1, additives include high-doping additives and corrosion-resistant additives, high-doping additives are silicon-aluminum-boron ternary alloys, and silicon-aluminum-boron ternary alloys are composed of the following components in parts by weight: 1 part of silicon, 80 parts aluminum and 15 parts boron.

[0036] A preparation method for a back field aluminum paste applied to an N-type crystalline silico...

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