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A low warpage solar cell back aluminum paste
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A solar cell, low warpage technology, applied to conductive materials, circuits, electrical components, etc. dispersed in non-conductive inorganic materials, can solve the problems of loss of heat shrinkage and cold expansion, metal antimony is easy to oxidize, and high sintering process requirements , to achieve the effect of reducing thermal expansion coefficient, improving warpage and reducing warpage
Active Publication Date: 2016-02-17
JIANGSU RUIDE NEW ENERGY TECH
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Problems solved by technology
However, in the aluminum conductive paste added with metal antimony, the metal antimony is easily oxidized when heated. If it is oxidized, it will lose the characteristics of heat shrinkage and cold expansion. Therefore, this aluminum conductive paste has higher requirements for the sintering process.
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Embodiment 1
[0023] The invention is a low-warp solar cell back aluminum paste, the components of which are calculated by weight percentage: 80% of aluminum powder, 7% of lead-free glass powder, 22.9% of organic carrier, and 0.1% of hollow glass microspheres. The particle size of glass microspheres is ≤6.5μm. The components of hollow glass microspheres include: 60% SiO 2 , 15%Al 2 o 3 , 15%Na 2 O, 5%ZrO 2 , 3%CaO, 2%MgO. The particle size of lead-free glass powder is ≤6.5μm, and the components include: 5%B by weight percentage 2 o 3 、85%Bi 2 o 3 , 2%ZnO, 5%SiO 2 , 3%MoO 3 .
Embodiment 2
[0025] The invention is a low-warp solar cell back aluminum paste, the components of which are calculated by weight percentage: 60% of aluminum powder, 0.5% of lead-free glass powder, 29.5% of organic carrier, 5% of hollow glass microspheres, pure metal Antimony powder 5%, the particle size of the hollow glass microspheres is 1.3~2.6μm, and the surface is treated with a coupling agent. The components of hollow glass microspheres include: 75% SiO 2 , 10%Al 2 o 3 , 10%Na 2 O, 4%ZrO 2 , 1% CaO. The particle size of lead-free glass powder is 1.3~6.5μm, and the components include: 15%B 2 o 3 、55%Bi 2 o 3 , 8%ZnO, 15%SiO 2 , 2%MoO 3 , 5%ZrO 2 .
Embodiment 3
[0027] The invention is a low-warp solar battery back aluminum paste, the components of which are calculated by weight percentage: 73% of aluminum powder, 4% of lead-free glass powder, 19.5% of organic carrier, 2.5% of hollow glass microspheres, surface coated 1% metal antimony powder coated with antimony trioxide, the particle size of the hollow glass microspheres is 1.3~2.6μm, and the surface is treated with a coupling agent. The particle size of hollow glass microspheres is 2.6~6.5μm, and the components include: 73% SiO 2 , 13%Al 2 o 3 , 11%Na 2 O, 1%ZrO 2 , 1.5%CaO, 0.5%MgO. The particle size of lead-free glass powder is 2.6~6.5μm, and the components include: 10%B 2 o 3 、67%Bi 2 o 3 , 3%ZnO, 13%SiO 2 , 5%MoO 3 , 2%ZrO 2 .
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Abstract
The invention relates to a low-warpage solar cell aluminum-back paste which comprises, by weight, 60-80% of aluminum powder, 0.5-7% of lead-free glass powder, 19.5-29.5% of organic carriers, 0.1-5% of hollow glass beads, and 0-5% of metallic antimony powder. The grain size of each hollow glass bead is smaller than or equal to 6.5 micro meters, and the metallic antimony powder is metallic antimony powder with the surface coated with antimonous oxide as optimization. The hollow glass beads are added in the formula of the aluminum-back paste, the inside of each hollow glass bead is vacuum or filled with thin gas, so that the aluminum-back paste is prevented from thermal impact in the heat-agglomerating or cool-forming process, the thermal expansion coefficient is lowered, and warpage of an aluminum membrane is lowered. In addition, the surface of the metallic antimony powder is coated with the antimonous oxide, so that the metallic antimony powder is prevented from being in direct contact with air in the drying and sintering processes, the antimony powder is restrained from being oxidized to be antimonous oxide to volatilize and loss the characteristic of thermal shrinkage and cold expansion, and warpage of the obtained aluminum membrane is further lowered.
Description
technical field [0001] The invention relates to a conductive paste, in particular to a low warpage solar battery back aluminum paste. Background technique [0002] In the manufacture of crystalline silicon solar cells, the aluminum paste is printed on the back of the silicon wafer using a screen, and after drying, sintering, cooling and other processes, a silicon-aluminum alloy layer can be formed between the silicon substrate and the aluminum layer to eliminate silicon. The Schottky barrier between the sheet and the electrode achieves good ohmic contact, and an aluminum-doped silicon epitaxial growth layer, that is, the back field layer, is formed on the cooled silicon sheet to increase the open circuit voltage of the battery and improve the photoelectricity. conversion efficiency. At present, the research and development of back aluminum paste not only considers improving the photoelectric conversion efficiency of the battery, but also mainly needs to consider the warpage...
Claims
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Application Information
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