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

Conducting aluminum paste for silicon solar cell and preparation method thereof

A technology of silicon solar cells and aluminum paste, which is applied in the manufacture of cables/conductors, conductive materials dispersed in non-conductive inorganic materials, circuits, etc., can solve problems such as warping of silicon wafers, and achieve firm adhesion and strong adhesion Good, high conversion efficiency

Inactive Publication Date: 2012-06-27
IRICO
View PDF8 Cites 9 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the current aluminum paste technology, the aluminum film adheres firmly to the silicon substrate after sintering, and does not produce aluminum beads or blisters after sintering. The photoelectric conversion efficiency of single crystal silicon wafers has reached an average of 18% in production, but silicon wafers warping is still there

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

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Conducting aluminum paste for silicon solar cell and preparation method thereof
  • Conducting aluminum paste for silicon solar cell and preparation method thereof
  • Conducting aluminum paste for silicon solar cell and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] An aluminum paste for silicon solar cells, composed of:

[0018]

[0019] Aluminum powder No. 1 is spherical aluminum powder, particle size D 50 7-8 microns, purity > 98%, aluminum powder No. 2 is spherical aluminum powder, particle size D 50 1-2 microns, purity > 98%, aluminum powder No. 3 is aluminum alloy powder (aluminum alloy model is 3003), particle size D 50 400-600 nanometers, metal purity > 99%. Glass powder is lead-free glass powder, specifically Bi 2 o 3 -B 2 o 3 -ZnO system glass powder, the median particle size D of the glass powder 50 It is 0.5-4um, and its melting point is 650-730°C.

[0020] First weigh the three kinds of aluminum powders in proportion, add them to the roller bottle machine and mix for 3 hours; the organic carrier raw materials are ethyl cellulose STD-10 11%, tri-n-butyl citrate 25%, and the balance is butyl carbit Add alcohol acetate in proportion, heat in a container with a 75°C water bath, and use electric stirring at a spe...

Embodiment 2

[0023] A silicon solar cell aluminum paste, composed of:

[0024]

[0025] Aluminum powder No. 1 is spherical aluminum powder, particle size D 50 7-8 microns, purity > 98%, aluminum powder No. 2 is spherical aluminum powder, particle size D 50 1-2 microns, purity > 98%, aluminum powder No. 3 is aluminum alloy powder (aluminum alloy model is 1100), particle size D 50 400-600 nanometers, metal purity > 99%. Glass powder is lead-free glass powder, specifically Bi 2 o 3 -B 2 o 3 -ZnO system glass powder, the median particle size D of the glass powder 50 It is 0.5-4um, and its melting point is 650-730°C.

[0026] First weigh the three kinds of aluminum powders in proportion, add them to the roller bottle machine and mix for 2 hours; the organic carrier raw materials are ethyl cellulose STD-10 15%, tri-n-butyl citrate 15%, and the balance is butyl carbit Add alcohol acetate in proportion, heat in a container with a 75°C water bath, and use electric stirring at a speed of ...

Embodiment 3

[0029] A silicon solar cell aluminum paste, composed of:

[0030]

[0031] Aluminum powder No. 1 is spherical aluminum powder, particle size D 50 7-8 microns, purity > 98%, aluminum powder No. 2 is spherical aluminum powder, particle size D 50 1-2 microns, purity > 98%, aluminum powder No. 3 is aluminum alloy powder (aluminum alloy model is 5005), particle size D 50 400-600 nanometers, metal purity > 99%. Glass powder is lead-free glass powder, specifically Bi 2 o 3 -B 2 o 3 -ZnO system glass powder, the median particle size D of the glass powder 50 It is 0.5-4um, and its melting point is 650-730°C.

[0032] First weigh the three kinds of aluminum powders in proportion, add them to the roller bottle machine and mix for 3 hours; the organic carrier raw materials are ethyl cellulose STD-10 8%, tri-n-butyl citrate 35%, and the balance is butyl carbit Add alcohol acetate in proportion, heat in a container with a 75°C water bath, and use electric stirring at a speed of 5...

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 diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
particle diameteraaaaaaaaaa
Login to View More

Abstract

The invention relates to conducting aluminum paste for a silicon solar cell and a preparation method thereof. The conducting aluminum paste is characterized by comprising the following components in percentage by mass: 0.8-2% of glass powder, 10-25% of 2# aluminum powder, 2-8% of 3# aluminum powder, 7-25% of organic carrier, 0.5-2.5% of dispersing agent, 0.2-0.5% of defoaming agent, 0.5-1.5% of inorganic additive and the balance of 1# aluminum powder. By adopting the conducting aluminum paste provided by the invention, not only can the adhesive force be guaranteed to be firm and an aluminum bead and a bubble be not generated after the conducting aluminum paste is sintered, but also the problem that a silicon wafer warps also can be solved, and simultaneously, in a production process, the photoelectric conversion efficiency of a monocrystalline silicon wafer averagely reaches above 18.5%. The aluminum powder of the aluminum paste is obtained by mixing submicron-sized aluminum powder and several kinds of nanometer-sized aluminum powder in proportion, and the aluminum paste obtained by using the mixed aluminum powder has the advantages of no aluminum bead in a sintering process, no warp, good adhesive force, high conversion efficiency and the like.

Description

technical field [0001] The invention relates to a conductive aluminum paste for silicon solar cells and a preparation method thereof. Background technique [0002] In recent years, with the increasing shortage of conventional energy sources such as coal, oil, and natural gas, it is imminent to develop renewable new energy sources. Countries have invested huge sums of money in the development of various new energy sources. Among them, the development of solar energy is the most eye-catching, and especially The most rapid development of solar cells. According to statistics, the global solar cell industry increased by 17 times in 10 years from 1994 to 2004, and the production of solar cells is mainly distributed in Japan, Europe and the United States. Domestic research on solar cells started in 1958. At present, my country has become a major producer of solar cells in the world. Because our government attaches great importance to solar power generation. China is expected to ...

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 Applications(China)
IPC IPC(8): H01B1/22H01B13/00H01L31/0224
Inventor 朱万超
Owner IRICO