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Passivation emitter solar cell back silver paste

A technology for solar cells and passivated emitters, applied to conductive materials, circuits, electrical components, etc. dispersed in non-conductive inorganic materials, can solve p-n junction damage, poor adhesion between back silver and back passivation film, Problems such as poor contact performance, to achieve the effect of reducing reaction, excellent contact performance, and reducing surface recombination loss

Active Publication Date: 2017-10-20
JIANGSU RUIDE NEW ENERGY TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Titanium tetrafluoride in the above components will decompose at 400°C, resulting in poor adhesion between the back silver and the back passivation film, and the contact between the lightly doped emitter and the high square resistance emitter of single crystal and polycrystalline solar cells. Poor performance; the back silver paste will react with the passivation layer, corrode the passivation layer, the carrier surface recombination loss and surface recombination will greatly damage the p-n junction

Method used

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  • Passivation emitter solar cell back silver paste
  • Passivation emitter solar cell back silver paste
  • Passivation emitter solar cell back silver paste

Examples

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Embodiment 1

[0027] In embodiment 1, inorganic binder is PbO-ZnO-Bi 2 o 3 -B 2 o 3 -SiO 2 -Sb 2 o 3 System glass powder; wherein the organic solvent in the organic carrier is ethylene glycol butyl ether acetate, and the weight percentage of the organic solvent in the organic carrier is 80%, and the surfactant and rheological agent are not included in Example 1. The composition of glass frit A of embodiment 1 is 35% PbO, 10% Bi 2 o 3 , 5% B 2 o 3 , 40% SiO 2 , 5% Al 2 o 3 , 2% ZnO and 3% CaO; the composition of glass frit B is 30% PbO, 30% TeO 2 , 10% MnO 2 , 5% CuO and 15% ZrO 2 , the weight ratio of glass powder A to glass powder B is 10:1. The specific surface area of ​​silver powder is 1~2m 2 / g; tap density 2.5~3.5g / cm 3 . The silver powder is selected from a conventional particle size of 0.2-1.7 μm; the thickener is alkyd resin.

Embodiment 2

[0028] The difference between Example 2 and Example 1 lies in the weight percentage of the components of the silver paste, as shown in the above table.

[0029] The difference between embodiment 3-9 and embodiment 2 is the composition of glass powder A and glass powder B:

Embodiment 3

[0030] The composition of embodiment 3 glass powder A is: PbO20%, Bi 2 o 3 50%, B 2 o 3 5%, SiO 2 14%, Al 2 o 3 3%, ZnO6%, CaO2%; the composition of glass frit B is: PbO13%, TeO 2 20%, MnO 2 50%, CuO10%, ZrO 2 7%;

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Abstract

The invention discloses a passivation emitter solar cell back silver paste which comprises main ingredients: an organic carrier, an inorganic binder and silver powders, wherein the organic carrier comprises an organic solvent, a thickener and other auxiliary agents; the inorganic binder is formed by mixing glass powders A and glass powders B; the glass powders A comprise PbO, Bi2O3, B2O3, SiO2, Al2O3, ZnO and CaO; the glass powders B comprises PbO, TeO2, MnO2, CuO and ZrO2; the glass powders A and the glass powders B have a weight ratio of (4 to 8): 1. The passivation emitter solar cell back silver paste, by adjusting the composition of the inorganic binder, reduces the activity of the inorganic binder, reduces the reaction between the glass powders and a passivation film, and avoids the formation of a large number of compound centers between the silver paste and a silicon chip silicon chip contact portion. The inorganic binder is low in sintering peak temperature so as to avoid aggravating the reaction of glass powders and the passivation film under a high temperature condition.

Description

technical field [0001] The invention relates to the technical field of electronic paste, in particular to a passivated emitter solar cell back silver paste. Background technique [0002] PERC solar cells are passivated emitter backside contact cells. The characteristics of the cells are: (1) Passivation films are deposited on both sides of the cells. The passivation films have dual functions of anti-reflection and increasing red light, and reduce the current carrying (2) Grooves are made on the back dielectric layer by laser technology to expose the linear or dot-shaped silicon substrate, and the aluminum paste of the back field is directly covered on the back passivation film to form a local silicon substrate. touch. According to the structural characteristics of the PERC battery, the battery needs double-sided passivation and local contact on the back, so as to greatly reduce the surface recombination and improve the conversion efficiency of the battery. [0003] Excelle...

Claims

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Application Information

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IPC IPC(8): H01B1/16H01B1/22H01L31/0224
CPCH01B1/16H01B1/22H01L31/022425
Inventor 戈士勇
Owner JIANGSU RUIDE NEW ENERGY TECH
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