Single-crystal double-sided PERC battery back side electrode silver paste and preparation method thereof
A technology of back electrode and silver paste, which is applied in the field of solar cells, can solve the problems of weak passivation layer etching ability, back electrode and back electric field can not match the back electrode, corrosion passivation layer adhesion, etc., to improve photoelectric conversion Efficiency, guaranteed battery electrical performance, and good electrical conductivity
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[0042] The present invention also proposes a method for preparing a silver paste for the back electrode of a single-crystal double-sided PERC battery, which is characterized in that it comprises the following steps:
[0043] (1) Weigh the resin, organic solvent and other additives according to the mass ratio (5~20):(70~90):(1~10), first add the resin to the organic solvent to dissolve to obtain a transparent resin solution, and then Mechanically mixing the transparent resin solution with other additives to obtain an organic vehicle;
[0044] (2) Weigh the conductive functional phase, the inorganic binder phase and the organic carrier prepared in step (1) according to the mass ratio (45-70): (1-8): (25-50), mix and roll to obtain a single Crystal bifacial PERC battery back electrode silver paste.
[0045] Preferably,
[0046] In the step (1), the dissolving is heating and stirring at 50-100°C at a stirring rate of 1500r / min for 0.5-2.5h;
[0047] In the step (2), the rolling...
Embodiment 1
[0049] Formulation Design and Preparation of Inorganic Binder Phase
[0050] This example provides five inorganic binder phase formulations (G1, G2, G3, G4 and G5), and the softening point (Ts) of the inorganic binder phase is measured by DSC (thermal analysis method). The specific components, proportions, softening points and high-temperature viscosities of the five inorganic binder phase formulations are shown in Table 1.
[0051] (1) Inorganic binder phase G1
[0052] G1 consists of the following components in mass percentage (wt%): 55% PbO, 8% Bi 2 o 3 , 12% TeO 2 , 6% B 2 o 3 , 8% SiO 2 , 6% Al 2 o 3 , 3% MgO, 0.5% Na 2 O, 1.5% MnO 2 .
[0053] The preparation method includes the following steps: a. Mix the components evenly and put them into a crucible, then heat the crucible in an electric furnace for melting at 1200°C and keep it warm for 30 minutes; b. Pour the melted glass liquid into water immediately Quenching and drying; c, crushing the dried glass fri...
Embodiment 2
[0072] This example provides two kinds of organic vehicles (A1 and A2).
[0073] (1) Organic carrier A1
[0074] Organic vehicle A1 is made up of each component of following mass percent (wt%): 10.1% resin (ethyl cellulose 300), 87.2% organic solvent (terpineol, alcohol ester twelve, kerosene, DBE) , 1.8% of other additives (polyvinyl chloride, BASF A-81 formaldehyde resin).
[0075] The preparation method of organic carrier A1 comprises the following steps:
[0076] Take by weighing 10g ethyl cellulose 300, 70g terpineol, 15g alcohol ester dodeca, 1g kerosene, 1.2gDBE, 1g polyvinyl chloride, 0.8g BASF A-81 aldehyde resin, first resin (ethyl cellulose 300) Add it to organic solvents (terpineol, alcohol ester twelve, kerosene, DBE), then place it in a heat-sealable container with shear and mix it, heat and stir at 90°C for 2 hours until the resin matrix is completely dissolved and becomes transparent liquid, and then cooled to room temperature, and mechanically mixed the tra...
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