Lithium-tellurium silicon-lead bismuth multi-component glass-oxide-complex system and conductive paste containing same
View Patent ↗The present disclosure discloses a lithium-tellurium silicon-lead bismuth multi-component glass-oxide-complex system and conductive paste containing same, belonging to the technical field of solar cells. According to the present disclosure, a “functional modularization” strategy is adopted in a formula design of the glass-oxide-complex system, and glass oxide systems with selective reactivity for different passivation layers are compounded based on the structures, compositions and thicknesses of the passivation layers, so that a paste formula is developed, which is composed of lithium-containing, tellurium-silicon-containing and lead-containing glass oxides. Due to adoption of the modularized formula strategy, active ingredients can be better controlled, and the overall paste formula is more optimized, so that the laminated passivation layers can be selectively burned through to obtain a more balanced contact, and better battery performance on silicon wafers with different passivation layer thicknesses can be achieved, thus achieving excellent photoelectric conversion efficiency.
1. A lithium-tellurium silicon-lead bismuth multi-component glass-oxide-complex system for solar cell conductive paste, wherein the system is prepared by mixing a lithium-containing glass-oxide-complex (A-GOC), a tellurium silicon-containing glass-oxide-complex (T-GOC), a lead bismuth-containing glass-oxide-complex (L-GOC), and a balanced phase glass-oxide-complex (D-GOC),
wherein
the lithium-containing glass-oxide-complex (A-GOC) is obtained by mixing and melting Li 2 O, Bi 2 O 3 , PbO, ZnO, and B 2 O 3 to form a glass-oxide frit, then quenching, and grinding; and based on the total mass of A-GOC, the formula of the A-GOC comprises: 15-25% by mass of Li 2 O, 50-70% by mass of PbO, 10-20% by mass of Bi 2 O 3 , 0-6% by mass of ZnO, and 0.5-3% by mass of B 2 O 3 ;
the lead bismuth-containing glass-oxide-complex (L-GOC) is obtained by mixing and melting PbO, Bi 2 O 3 , SiO 2 , Al 2 O 3 , ZnO and B 2 O 3 to form a glass-oxide frit, then quenching, and grinding; and based on the total mass of the L-GOC, a formula of the L-GOC comprises: 2-50% by mass of PbO, 5-85% by mass of Bi 2 O 3 , 2-10% by mass of SiO 2 , 0.5-15% by mass of Al 2 O 3 , 0-6% by mass of ZnO, and 0.5-25% by mass of B 2 O 3 ;
the tellurium silicon-containing glass-oxide-complex (T-GOC) is obtained by mixing and melting SiO 2 , TeO 2 —, Bi 2 O 3 , O 2 O 3 , and Na 2 O to form a glass-oxide frit, then quenching, and grinding; and based on the total mass of the T-GOC, the formula of the T-GOC comprises: 10-20% by mass of SiO 2 , 60-80% by mass of TeO 2 , 2-20% by mass of Bi 2 O 3 , 0.5-2% by mass of B 2 O 3 , and 0.5-2% by mass of Na 2 O;
the balanced phase glass-oxide-complex (D-GOC) is obtained by mixing and melting one or more metal oxides used in the A-GOC, the L-GOC and the T-GOC to form a glass-oxide frit, then quenching, and grinding; and based on the total mass of the D-GOC, a formula of the D-GOC comprises: 35-50% by mass of SiO 2 , 20-30% by mass of PbO, 2-10% by mass of MgO, 0.5-2% by mass of TiO 2 , and 25-40% by mass of Bi 2 O 3 .
2. Conductive paste containing the lithium-tellurium silicon-lead bismuth multi-component glass-oxide-complex system according to claim 1 .