Low-temperature curing backside silver paste for all-aluminum backfield crystalline silicon solar cells
A solar cell and all-aluminum back field technology, which is applied in circuits, electrical components, photovoltaic power generation, etc., can solve the problems of battery open-circuit voltage reduction, short-circuit current reduction, and low density of aluminum paste on the back, so as to improve open-circuit voltage and short-circuit current, improve electrical conductivity and adhesion, and improve photoelectric conversion efficiency
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Embodiment 1
[0030] Weigh 10 parts of spherical silver powder with particle diameter D50 of 0.8 μm, 60 parts of flake silver powder with D50 of 4.0 μm, 20 parts of bisphenol A epoxy resin E51, reactive diluent butanediol diglycidyl ether 8.3 parts by mass. Parts, 1.18 parts of curing agent dicyandiamide, 0.02 parts of curing accelerator 2-methylimidazole, 0.5 parts of thixotropic additive fumed silica, put the above materials into a planetary mixer with rotation and revolution functions in turn and mix After uniformity, transfer the uniformly mixed material to a three-roll mill for grinding and dispersion according to a certain process to obtain a slurry with a fine and uniform appearance without coarse particles. After testing, the fineness is <10μm and the viscosity is 46Pa.S. After being further filtered through a 200-mesh screen, it was packaged and stored at -5°C for future use.
[0031] In the crystalline silicon solar cell production line, the standard raw material single crystal ba...
Embodiment 2
[0035] Take by weight D50 and be 20 parts of spherical silver powder of 2.0 μ m, D50 be 60 parts of flaky silver powder of 2.8 μ m, 14 parts of bisphenol A type epoxy resin E51, 5 parts of reactive diluent phenyl glycidyl ether, 0.77 parts of curing agent dicyandiamide, 0.03 parts of curing accelerator 2-ethyl-4-methylimidazole, 0.2 parts of thixotropic additive polyamide wax, put the above materials into a planetary mixer with rotation and revolution functions in turn After mixing evenly, transfer the evenly mixed material to a three-roll mill for grinding and dispersing according to a certain process to obtain a slurry with a fine and uniform appearance without coarse particles. After testing, the fineness is <12μm and the viscosity is 34Pa.S. After being further filtered through a 200-mesh screen, it was packaged and stored at -5°C for future use.
[0036]The above paste was made according to the process flow described in Example 1, wherein the silver paste on the back was ...
Embodiment 3
[0039] Weigh 15 parts of commercially available spherical silver powder with particle diameter D50 of 1.2 μm, 50 parts of flake silver powder with D50 of 3.2 μm, 25 parts of bisphenol A epoxy resin E44, and reactive diluent cresyl glycidyl ether 8.5 parts by mass. Parts, 1.16 parts of curing agent dicyandiamide, 0.04 parts of curing accelerator 2-phenylimidazole, 0.3 parts of thixotropic additive hydrogenated castor oil, put the above materials into a planetary mixer with rotation and revolution functions and mix evenly Finally, the uniformly mixed material is transferred to a three-roll mill for grinding and dispersion according to a certain process, and a slurry with a fine and uniform appearance without coarse particles is obtained. After testing, the fineness is <8μm and the viscosity is 49Pa.S. After being further filtered through a 200-mesh screen, it was packaged and stored at -5°C for subsequent use.
[0040] The above paste was followed by the process described in Exa...
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