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US 9,793,025 B2Granted
Conductive paste composition and semiconductor devices made therewith
AssigneeE. I. Du Pont de Nemours and Company
InventorsCarmine Torardi, Paul Douglas Vernooy
Life of this patent
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Abstract
A conductive paste composition contains a source of an electrically conductive metal, a boron lithium tellurium oxide, and an organic vehicle. An article such as a high-efficiency photovoltaic cell is formed by a process of deposition of the paste composition on a semiconductor device substrate (e.g., by screen printing) and firing the paste to remove the organic vehicle and sinter the metal and establish electrical contact between it and the substrate.
Claims20
A paste composition comprising:
- an inorganic solids portion comprising:
- a source of electrically conductive metal and
- a boron lithium tellurium oxide containing boron, lithium and tellurium cations that together comprise at least 80% of the cations present in the boron lithium tellerium oxide, and wherein the minimum content of boron, lithium and tellurium cations is at least 15, 10 and 20 cation%, respectively;
- and
- an organic vehicle in which the source of electrically conductive metal and the boron lithium tellurium oxide are dispersed.
2 more elements
A process for forming an electrically conductive structure on a substrate, the process comprising:
- (a) providing a substrate having a first major surface and an insulating layer thereon that comprises aluminum oxide, titanium oxide, silicon nitride, SiNx:H, silicon oxide, or silicon oxide/titanium oxide;
- (b) applying a paste composition onto a preselected portion of the insulating layer on the first major surface, wherein the paste composition comprises:
- i) a source of electrically conductive metal,
- ii) a boron lithium tellurium oxide containing boron, lithium and tellurium cations that together comprise at least 80% of the cations present in the boron lithium tellurium oxide, and wherein the minimum content of boron, lithium and tellurium cations is at least 15, 10 and 20 cation%, respectively;
- and
- iii) an organic vehicle in which the source of electrically conductive metal and the boron lithium tellurium oxide are dispersed;
- and
- (c) firing the substrate and paste composition thereon, wherein the insulating layer is penetrated and the electrically conductive metal is sintered during the firing to form the electrically conductive structure and provide electrical contact between the electrically conductive metal and the substrate.
5 more elements
Dependencies are inferred from the claim text.