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A kind of silver paste for solar back passivation perc battery back electrode

A back electrode and solar energy technology, which is applied in the field of silver paste for solar back passivation PERC battery back electrode, can solve the problems of destroying the passivation film and discounting the efficiency of PERC battery passivation, etc., to ensure the minority carrier life, The effect of improving photoelectric conversion efficiency and opening voltage

Active Publication Date: 2017-08-01
浙江晶科新材料有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] After the conventional back silver paste on the market is applied to PERC cells, some of them can indeed obtain high tensile force, but basically destroy the passivation film, which makes the effect of passivation and efficiency improvement of PERC cells discounted.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Embodiment 1, this back silver paste is fed intake by following mass percentage composition:

[0019] (1), spherical silver powder: 15%; (2), flake silver powder: 50%; (3), organic vehicle: 32.5% (4), glass powder: 2.5%

[0020] Wherein the organic carrier is charged according to the ratio of the following mass percentages:

[0021] 1), terpineol: 50%; 2), butyl carbitol: 39.3%; 3) ethyl cellulose: 8%, 4) hydrogenated castor oil: 1.2%; 5) lecithin: 0.7%; 6 ) leveling agent organomodified polysiloxane: 0.8%.

[0022] Glass powder is fed according to the following mass percentages:

[0023] 10% copper oxide, 4% zinc oxide, 5% cerium oxide, 12% barium oxide, 8% silicon oxide, 10% strontium oxide, 10% antimony oxide, 41% bismuth oxide.

[0024] The preparation method of this slurry comprises the following steps:

[0025] 1. Prepare glass powder according to the conventional process (including melting, ball milling, etc.); 2. Prepare the organic carrier according to the ...

Embodiment 2

[0029] Embodiment 2, this back silver paste feeds intake by following mass percentage:

[0030] (1), spherical silver powder: 20%; (2), flake silver powder: 45%; (3), organic carrier: 32% (4), glass powder: 3%

[0031] Wherein the organic carrier is charged according to the following mass percentages:

[0032] 1), terpineol: 48%; 2), butyl carbitol: 41.3%; 3) ethyl cellulose: 8%, 4) hydrogenated castor oil: 1.2%; 5) lecithin: 0.7%; 6 ) Organomodified polysiloxane: 0.8%.

[0033] Glass powder is fed according to the following mass percentages:

[0034] 14% copper oxide, 4% nickel oxide, 5% neodymium oxide, 10% barium oxide, 10% silicon oxide, 10% strontium oxide, 10% antimony oxide, 37% bismuth oxide.

[0035] The preparation method of this slurry comprises the following steps:

[0036] 1. Prepare glass powder according to the conventional process (including melting, ball milling, etc.); 2. Prepare the organic carrier according to the conventional process (including heating...

Embodiment 3

[0040] Embodiment 3, this back silver paste feeds intake by following mass percentage:

[0041] (1), spherical silver powder: 15%; (2), flake silver powder: 45%; (3), organic vehicle: 36.8% (4), glass powder: 3.2%

[0042] Wherein the organic carrier is charged according to the following mass percentages:

[0043] 1), alcohol ester twelve: 46.7%; 2), butyl carbitol acetate: 41.3%; 3) ethyl cellulose: 9%, 4) polyamide wax: 1.5%; 5) Sipan: 0.7 %; 6) Organomodified polysiloxane: 0.8%.

[0044] Glass powder is fed according to the following mass percentages:

[0045] 14% copper oxide, 4% nickel oxide, 5% neodymium oxide, 10% barium oxide, 10% silicon oxide, 10% strontium oxide, 5% antimony oxide, 42% bismuth oxide.

[0046] The preparation method of this slurry comprises the following steps:

[0047]1. Prepare glass powder according to the conventional process (including melting, ball milling, etc.); 2. Prepare the organic carrier according to the conventional process (includi...

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Abstract

The invention discloses a silver paste for a solar energy back passivation PERC battery back electrode. The silver paste is obtained by uniformly mixing silver powder, glass powder and an organic carrier; with a total amount being 100%, the silver paste comprises 55%-70% of the silver powder, 2%-5% of the glass powder and 25%-43% of the organic carrier. According to the silver paste for the solar energy back passivation PERC battery back electrode, the silver paste which is prepared by mixing the silver powder, glass powder and an organic carrier by a specified ratio is adopted; the silver paste is less than 10 [mu]m in fineness, 40-70 Pa.s in viscosity and greater than 4 N in pulling force; the silver paste increases by 1-2 mv in open voltage and increases by 5-10 mA in short current; the silver paste is 0.05%-0.12% greater than a conventional back silver paste in efficiency; the silver pastes is applied to a solar energy back passivation PERC batteries, the silver paste can accurately runs through an SiNx protection layer while not running through an AIOx passivation layer, that minority carrier lifetime of electrode points cannot be reduced can be effectively ensured, the open voltage is improved, and photoelectric conversion efficiency can be of battery sheets can be improved.

Description

technical field [0001] The invention belongs to the technical field of silver paste, and in particular relates to a silver paste for solar back passivation PERC cell back electrode. Background technique [0002] With the increasing shortage of global energy, the development and utilization of more efficient clean energy is more urgent. Because of the advantages of no pollution and large market space, crystalline silicon solar cells that directly use solar radiation to generate electricity are currently the mainstream. With the development of science and technology and the demand of the market, it has become the goal of major manufacturers to develop more efficient solar cells at a lower cost. [0003] Rear passivated PERC (passivated emitter and rear cell) cells, as the current mainstream high-efficiency solar cells, have been favored by major manufacturers in recent years due to their advantages of input-output ratio and fast cost recovery. The core of its efficiency impr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B1/22H01L31/0224
CPCH01B1/22H01L31/022425Y02E10/50
Inventor 彭长春杨磊张学建陈小龙吴文杰
Owner 浙江晶科新材料有限公司
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