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Heterojunction solar cell conductive silver paste and low-temperature curing method thereof

A technology of solar cells and conductive silver paste, which is applied in the direction of cable/conductor manufacturing, equipment for manufacturing conductive/semiconductive layers, conductive materials dispersed in non-conductive inorganic materials, etc., which can solve the development of heterojunction solar cells Obstacles, poor grid line resistance, poor printing performance, and low substrate contact strength have achieved good low-temperature curing, improved peel strength, and narrowed line width.

Inactive Publication Date: 2020-06-26
SHANGHAI TRANSCOM ELECTRONICS TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The conductive silver paste for solar cells in the prior art has defects such as poor low-temperature curing performance, low substrate contact strength, grid resistance and poor printing performance, which hinder the development of heterojunction solar cells.

Method used

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  • Heterojunction solar cell conductive silver paste and low-temperature curing method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] This embodiment provides a conductive silver paste for heterojunction solar cells, which includes the following components according to weight percentage:

[0013] 50-85% organic composite silver powder, 2-8% glass powder, 1-5.0% MnO2 powder; it is characterized in that it also includes 10% epoxy resin (EP), and the weight percentage sum of the above components is 100%.

[0014] The organic binder comprises the following components by weight percentage:

[0015] 0.05-10% of ethyl cellulose, 8-45% of organic solvent, 35-90% of organic film-forming auxiliary agent, 0-15% of organic additive, and the total weight percentage of the above components is 100%.

[0016] The organic solvent is any one or a combination of diethylene glycol butyl ether or diethylene glycol butyl ether acetate or dibutyl phthalate or dioctyl phthalate.

[0017] The organic composite silver powder is a silver powder material whose surface is coated with 0.03-2% surfactant.

[0018] The composition...

Embodiment 2

[0022] Such as figure 1 As shown, this embodiment provides a low-temperature curing method for conductive silver paste of heterojunction solar cells, including the following steps:

[0023] S1 is used to store the conductive silver paste of the heterojunction solar cell described in Example 1 in a 0-10 degree Celsius incubator;

[0024] S2 is used for the step of screen printing using the conductive silver paste for heterojunction solar cells described in Example 1;

[0025] S3 is a step of placing the semiconductor silicon wafer printed with conductive silver paste in a drying device for drying treatment;

[0026] S4 is a step of curing the silver paste printed on the semiconductor silicon wafer printed with the conductive silver paste.

[0027] The S2 is used for the step of screen printing using the conductive silver paste for heterojunction solar cells described in Example 1, and the printing speed is 300 mm / s.

[0028] The S2 is used in the step of screen printing usin...

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Abstract

The invention discloses heterojunction solar cell conductive silver paste and a low-temperature curing method thereof. The low-temperature curing method comprises the following steps: S1, placing theheterojunction solar cell conductive silver paste in a heat preservation cabinet at the temperature of 0-10 DEG C to be stored; S2, carrying out silk-screen printing by using the heterojunction solarcell conductive silver paste; S3, placing a semiconductor silicon wafer printed with the conductive silver paste in drying equipment to be dried; S4, curing the silver paste printed on the semiconductor silicon wafer printed with the conductive silver paste. The heterojunction solar cell conductive silver paste provided by the invention has good low-temperature curing performance; the contact strength of the base material is higher; the silver paste has low grid line resistance; the contact resistivity is low; the printing performance is good.

Description

technical field [0001] The invention relates to the technical field of solar cell photovoltaic industry, in particular to a conductive silver paste for a heterojunction solar cell and a low-temperature curing method thereof. Background technique [0002] Heterojunction solar cells were first developed by Japan's Sanyo (Panasonic) Corporation, which is a hybrid solar cell made of crystalline silicon base and amorphous silicon thin film. Since the upper surface of the heterojunction solar cell is TCO, the charge will not generate polarization on the TCO on the surface of the cell, and there is no PID phenomenon. The efficiency of HJT cells is 1-2% higher than that of P-type monocrystalline silicon cells. In HJT solar cells The Staebler-Wronski effect, which is common in amorphous silicon solar cells, does not occur in the cells. At the same time, the N-type silicon wafer used in the HJT battery has phosphorus as the dopant, and there is almost no light-induced attenuation phe...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01B1/22H01B13/00H01L31/0224
CPCH01B1/22H01B13/0026H01L31/022425Y02E10/50
Inventor 闫方存杨建平秦贤松薛慧龚健花
Owner SHANGHAI TRANSCOM ELECTRONICS TECH