Heraeus Precious Metals North America Conshohocken LLC

Raymond Michael Cosimano

Lei Wang

Cuiwen Guo

Weiming Zhang

Li Yan

Brenton Yancey

An inorganic reaction system comprising a lead-bismuth-tellurium-silicate composition of Formula (I): Pb&#x2014;Bi&#x2014;Te&#x2014;Si-M-O, wherein 0&#x3c;a, b, c, d, or g&#x2264;1, 0&#x2264;d, e&#x2264;1, and the sum of a, b, c, d and g is 1, 0&#x3c;a&#x2264;0.05, 0.2&#x3c;b&#x2264;0.95, 0&#x3c;c&#x2264;0.5, 0&#x3c;d&#x2264;0.2, 0&#x3c;g&#x2264;0.5, a:b is between about 0.1:99.9 to about 5:95, b:c is between about 50:50 to 99:1, a:c is between about 1:99 to about 10:90, b:g is between about 50:50 to about 98:2, M is one or more elements, and e is a number sufficient to balance the Pb, Bi, Te, Si, and M components.

Lead-bismuth-tellurium-silicate inorganic reaction system having improved adhesion properties

The invention relates to an inorganic reaction system used in the manufacture of electroconductive pastes. The inorganic reaction system comprises a lead containing composition and elemental tellurium, where in the lead containing composition is between 5-95 wt. % of the inorganic reaction system, and the elemental tellurium is between 5-95 wt. % of the inorganic reaction system. More preferably, the lead containing composition is between 40-90 wt. % of the inorganic reaction system, and the elemental tellurium is between 10-40 wt. % of the inorganic reaction system. The lead containing composition can be a glass frit and can further comprise lead oxide. Another aspect of the invention relates to an electroconductive paste composition that comprises metallic particles, an inorganic reaction system as disclosed, and an organic vehicle. Another aspect of the invention relates to an organic vehicle that comprises a binder, a surfactant, a solvent, and a thixatropic agent. Another aspect of the invention relates to a solar cell printed with an electroconductive paste composition as disclosed, as well as an assembled solar cell module. Another aspect of the invention relates to a method of producing a solar cell.

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Philadelphia, PA, United States of America

Raymond Michael Cosimano