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US 7,731,868 B2Granted
Thick film conductive composition and process for use in the manufacture of semiconductor device
AssigneeE.I. du Pont de Nemours and Company
InventorTakuya Konno
Life of this patent
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Abstract
The present invention is directed to a thick film conductive composition comprising: a) electrically conductive silver powder; b) ZnO powder; c) lead-free glass frits wherein based on total glass frits: Bi2O3: >5 mol %, B2O3: <15 mol %, BaO: <5 mol %, SrO: <5 mol %, Al2O3: <5 mol %; and d) organic medium, wherein (the content of ZnO/the content of the silver powder)×100 is more than 2.5.
Claims13
A thick film conductive composition comprising:
- a) electrically conductive silver powder;
- b) ZnO powder;
- c) lead-free glass frits wherein based on total glass frits:
- Bi2O3>5 mol %
- B2O3<15 mol %
- BaO<5 mol %
- SrO<5 mol %
- Al2O3<5 mol %;
- and
- d) organic medium,
- wherein (the content of ZnO/the content of the silver powder)×100 is more than 2.5.
8 more elements
A substrate coated with a composition comprising:
- a) electrically conductive silver powder;
- b) ZnO powder;
- c) lead-free glass frits wherein, based on total glass frits:
- Bi2O3 is 10.0 to 60 mol %
- B2O3<10 mol %
- BaO<2 mol %
- SrO<2 mol %
- Al2O3<2 mol %;
- and
- d) organic medium,
- wherein the content of ZnO divided by the content of the silver powder×100 is more than 2.5 and wherein the composition has been processed to remove the organic medium and sinter the glass frit and silver powder.
8 more elements
A thick film conductive composition consisting of:
- a) electrically conductive silver powder;
- b) ZnO powder;
- c) lead-free glass frits wherein based on total glass frits:
- Bi2O3>5 mol %
- B2O3<15 mol %
- BaO<5 mol %
- SrO<5 mol %
- Al2O3<5 mol %;
- and
- d) organic medium,
- wherein (the content of ZnO/the content of the silver powder)×100 is more than 2.5 and
- further consisting of an additional metal/metal oxide additive selected from the group consisting of (a) a metal selected from Zn, Gd, Ce, Zr, Ti, Mn, Sn, Ru, Co, Fe, Cu, and Cr;
- (b) an oxide of a metal selected from Gd, Ce, Zr, Ti, Mn, Sn, Ru, Co, Fe, Cu and Cr;
- (c) any compounds that can generate the metal oxides of (b) upon firing;
- and (d) mixtures thereof, wherein the particle size of the additional metal additive is no more than 10 μm.
12 more elements
Dependencies are inferred from the claim text.