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A high temperature resistant low warpage aluminum paste

A low-warpage, high-temperature-resistant technology, applied in conductive materials, electrical components, circuits, etc. dispersed in non-conductive inorganic materials, can solve problems such as protrusion and warpage, and achieve high comprehensive battery electrical performance and battery warpage. Small, good wetting effect

Active Publication Date: 2015-09-02
HUNAN RED SUN PHOTOELECTRICITY SCI & TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The inventor's previous invention patents are relatively high in terms of comprehensive electrical performance of the battery, but with the trend of thinning silicon wafers, the problem of warpage is more prominent

Method used

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  • A high temperature resistant low warpage aluminum paste
  • A high temperature resistant low warpage aluminum paste
  • A high temperature resistant low warpage aluminum paste

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Embodiment Construction

[0036] Below in conjunction with embodiment the present invention will be further described.

[0037] 1. Aluminum paste preparation

[0038] 1. Preparation of bismuth-based glass powder

[0039] Such as image 3 As shown, the analytically pure grade silicon dioxide, aluminum oxide, zinc oxide, antimony oxide, barium oxide, bismuth oxide and other oxides are weighed according to the following table, and mixed evenly with a V-type mixer, then put into the high alumina In the crucible, preheat it with a box-type sintering furnace at 300°C for 30 minutes, and then sinter in the box-type sintering furnace for 2 hours. After melting evenly, put it into ionized water for water quenching, and then use a pulverizer to crush it into a glass body of about 1mm. Finally, it is ball-milled by a planetary ball mill to 10 microns, after drying, the desired bismuth-based glass powder is obtained, with a median particle size of Dn50≤10 microns.

[0040] Table 1 Bismuth-based glass powder for...

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Abstract

The invention relates to high-temperature resistant and low-warpage aluminum paste which is composed of spherical aluminum powder, bismuth glass powder, inorganic annexing agents and organic carriers. The high-temperature resistant and low-warpage aluminum paste is mainly characterized in that the special organic carriers and the special inorganic annexing agents are used. The preparing method of the aluminum paste is that all the materials are mixed evenly and then ground by a three-roll grinder, and then the crystal silicon photovoltaic cell aluminum paste with fineness smaller than 20 micrometers and viscosity between 25 pa.s and 55 pa.s is obtained. When the aluminum paste prepared with the method is used for preparing an aluminum surface, the aluminum paste has the advantages that high sintering resisting performance is achieved, the process window is wide, the warping degree of a sintered battery piece is low, ohmic contact is good, and electrical performance is high.

Description

technical field [0001] The invention belongs to the field of electronic paste for crystalline silicon photovoltaic cells, and relates to a conductive aluminum paste for crystalline silicon photovoltaic cells, in particular to a high-temperature-resistant and low-warpage aluminum paste. Background technique [0002] With the development of solar cell manufacturing technology, the requirements for aluminum paste are that the aluminum paste has good printability, electrical conductivity, weather resistance and chemical resistance, and can be co-sintered with the front silver paste and the back silver paste. Good strength, low warpage of silicon wafer, good compactness of aluminum mold, no micro cracks, no aluminum beads, high photoelectric conversion rate. [0003] At present, in the crystalline silicon photovoltaic cell industry, in order to save materials and reduce costs, the trend of thinning silicon wafers is becoming more and more obvious, resulting in poor bending stress...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L31/0224H01B1/22
Inventor 谢于柳
Owner HUNAN RED SUN PHOTOELECTRICITY SCI & TECH
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