A silver-aluminum lap non-shrinkage back silver paste for crystalline silicon solar cells
A technology for solar cells and back silver paste, which is applied to conductive materials, circuits, electrical components and other directions dispersed in non-conductive inorganic materials, which can solve the problem that the aluminum paste does not have silver-aluminum overlap and the series resistance of the silver-aluminum overlap is high. , affecting the conversion efficiency of cells, etc., to achieve the effect of solving the problem of large resistance and high series resistance
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Embodiment 1
[0023] The back silver paste is fed according to the following mass ratio:
[0024] Ball silver 7%; flake silver 43%; organic vehicle 48.5%; glass powder 1.5%
[0025] Wherein the organic carrier is charged according to the following mass ratio:
[0026] 1), terpineol: 50%; 2), butyl carbitol: 38.5%; 3) ethyl cellulose: 10%, 4) polyamide wax: 1%; 5) lecithin: 0.5%;
[0027] The glass powder is fed according to the following mass ratio:
[0028] 28% bismuth oxide, 20% antimony oxide, 15% copper oxide, 7% tellurium oxide, 4% silicon oxide, 6% aluminum oxide, 10% zinc oxide, 10% boron oxide.
[0029] The preparation method of this slurry comprises the following steps:
[0030] 1. According to the formula defined in the present invention, glass powder is prepared according to conventional techniques (including melting, ball milling, etc.); 2. According to the formula defined in the present invention, organic glass powder is prepared according to conventional techniques (includi...
Embodiment 2
[0034] The back silver paste is fed according to the following mass ratio:
[0035] (1), ball silver: 10%; (2), sheet silver: 43%; (3), organic vehicle: 45.3% (4), glass powder: 1.7%
[0036] Wherein the organic carrier is charged according to the following mass ratio:
[0037] 1), terpineol: 47%; 2), butyl carbitol: 41.1%; 3) ethyl cellulose: 9.6%, 4) hydrogenated castor oil: 1.5%; 5) lecithin: 0.8%.
[0038] The glass powder is fed according to the following mass ratio:
[0039] 25% bismuth oxide, 22% antimony oxide, 15% copper oxide, 7% tellurium oxide, 4% silicon oxide, 6% aluminum oxide, 10% zinc oxide, 11% boron oxide.
[0040] Prepare the slurry as described in Example 1, the fineness is less than 10 μm, and the viscosity is 48 Pa.s. Then follow the description in Example 1 to carry out subsequent measurements using a metallographic microscope.
Embodiment 3
[0042] The back silver paste is fed according to the following mass ratio:
[0043] (1), ball silver: 5%; (2), flake silver: 48.7%; (3), organic vehicle: 45.3% (4), glass powder: 1%.
[0044] Wherein the organic carrier is charged according to the following mass ratio:
[0045] 1), terpineol: 27.4%; 2), alcohol ester twelve: 20%; 3) butyl carbitol acetate: 41.1%; 4) methyl cellulose: 2.6%; 5) ethyl cellulose 6.2%; 6) Polyamide wax: 1.2%; 7) Siban: 1.5%.
[0046] The glass powder is fed according to the following mass ratio:
[0047] 27% bismuth oxide, 22% antimony oxide, 13% copper oxide, 5% tellurium oxide, 4% silicon oxide, 8% aluminum oxide, 7% zinc oxide, 14% boron oxide.
[0048] Prepare the slurry as described in Example 1, the fineness is less than 10 μm, and the viscosity is 48 Pa.s. Then follow the description in Example 1 to carry out subsequent measurements using a metallographic microscope.
[0049] Comparison of test results:
[0050]
[0051] Where Rs is...
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