Unlock instant, AI-driven research and patent intelligence for your innovation.

Lead-free conductive silver paste for front faces of crystalline silicon solar cells

A solar cell and conductive silver paste technology, which is applied in the direction of conductive materials, circuits, electrical components, etc. dispersed in non-conductive inorganic materials, can solve the problem of insufficient wettability and stability of high-temperature fluid glass and substrate, which affects solar cells. Problems such as conversion efficiency and low short-circuit current of cells can be achieved to improve high-temperature fluidity and wettability, improve stability and electrical properties, and improve conversion efficiency

Active Publication Date: 2014-08-27
乐凯胶片股份有限公司
View PDF6 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to its deficiencies in the high-temperature fluidity of the glass, the wettability and stability of the glass and the substrate, the short-circuit current of the sintered cell is low, which affects the conversion efficiency of the cell.
[0004] In addition, since the silver paste used on the front side of the solar cell needs to be sintered under high temperature conditions, the silver particles are easily oxidized to form silver oxide in the high temperature environment, resulting in a decrease in the conductivity of the electrode, which also affects the conversion efficiency of the solar cell.

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] (1) Preparation of organic binder

[0030] Weigh 2g of ethyl cellulose and 1g of acrylic resin, add 3g of terpineol, 5g of butyl carbitol acetate, and 4g of diethylene glycol butyl ether, mix and heat to 60-90°C, dissolve to obtain an organic bond agent, spare.

[0031] (2) Preparation of lead-free conductive silver paste

[0032] Weigh 1.0g of γ-Al 2 O 3 (particle size is 20nm), 0.5g of B 2 O 3 -SiO 2 -Bi 2 O 3System lead-free glass binder (softening temperature of 500 ℃), mixed with 15 grams of the above organic binder, then add 75g of silver powder (particle size is 0.2 microns, tap density is 4.7g / cc), 10g The Sn-Ag (96.5Sn, 3.5Ag) metal alloy powder is mixed, stirred and ground to obtain the required lead-free conductive silver paste for the front side of the solar cell.

Embodiment 2

[0034] (1) Preparation of organic binder

[0035] Weigh 0.5 g of rosin, add 4.0 g of dibutyl phthalate and 5.5 g of terpineol, mix and heat to 60-90° C. and dissolve to obtain an organic binder, which is used for later use.

[0036] (2) Preparation of lead-free conductive silver paste

[0037] Weigh 3.0g of γ-Al 2 O 3 (particle size is 15nm), 2.0g Bi 2 O 3 - SiO 2 -ZnO system lead-free glass binder (softening temperature is 550 ℃), after mixing with 10 grams of the above organic binder, then add 80g silver powder (particle size is 1.0 micron, tap density is 4.9g / cc), 5.0g Sn-Ag-Cu (95.5Sn3.5Ag0.7Cu) metal alloy powder, mix, stir and grind to obtain the required lead-free conductive silver paste for the front side of the solar cell.

Embodiment 3

[0039] (1) Preparation of organic binder

[0040] Weigh 0.75 g of ethyl cellulose, add 2.25 g of butyl carbitol acetate and 2.0 g of diethylene glycol butyl ether, mix and heat to 60-90° C. and dissolve to obtain an organic binder, which is used for later use.

[0041] (2) Preparation of lead-free conductive silver paste

[0042] Weigh 5.0g of γ-Al 2 O 3 (particle size is 25nm), 1.3g of B 2 O 3 -ZnO-Sb 2 O 3 The system lead-free glass binder (softening temperature is 600 ℃), after mixing with 5.0 g of the above organic binder, then add 85 g of silver powder (particle size is 0.5 microns, tap density is 5.5 g / cc), 1.0 g Metal alloy powder Sn-Sb ((95Sn5Sb), mixed, stirred and ground to obtain the required lead-free conductive silver paste for the front side of the solar cell.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

PUM

PropertyMeasurementUnit
particle sizeaaaaaaaaaa
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention discloses lead-free conductive silver paste for front faces of crystalline silicon solar cells. The lead-free conductive silver paste is composed of, by weight, 75-85% of silver powder, 0.5-2% of lead-free glass binder, 1-10% of metal alloy powder, 5-15% of organic binder and 1-5% of active oxide, wherein the average particle size of the silver powder ranges from 0.2 micrometer to 1 micrometer, the tap density is larger than 4.5g / cc, and the active oxide is nano gamma-Al2O3 powder. Oxidation of silver particles can be effectively reduced while high-temperature liquidity and wettability of glass materials are improved and stability and electrical performances of the glass materials are improved, and accordingly the open-circuit voltage of the cells can be increased, electrical performances of the cells can be improved, and high conversion efficiency of the solar cells is achieved.

Description

technical field [0001] The invention belongs to the technical field of photovoltaic cells, and particularly relates to a lead-free conductive silver paste for the front side of crystalline silicon solar cells. Background technique [0002] A solar cell is a semiconductor device that converts solar energy into electrical energy. Under the condition of illumination, a photo-generated current is generated inside the solar cell, and the electrical energy can be directly outputted through the electrodes. In order to output the maximum amount of electrical energy, electrode fabrication is a very important link. Silicon solar cell electrodes include front silver electrodes and back field aluminum electrodes. The front silver electrodes have a great influence on the cell conversion efficiency of silicon solar cells. The performance of the silver paste directly determines the performance of the front electrodes of the solar cells. Key materials in battery manufacturing. [0003] Th...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to View More

Application Information

Patent Timeline
no application Login to View More
Patent Type & Authority Patents(China)
IPC IPC(8): H01B1/16H01B1/22H01L31/0224
Inventor 任明淑刘子英王小记
Owner 乐凯胶片股份有限公司