GLASS COMPOSITION AND CONDUCTIVE PASTE FOR ALUMINUM ELECTRODE WIRING, ELECTRONIC COMPONENT PROVIDED WITH THAT ALUMINUM ELECTRODE WIRING AND METHOD FOR PRODUCING THIS ELECTRONIC COMPONENT

• US 20120325297A1
• Filed: 02/17/2011
• Published: 12/27/2012
• Est. Priority Date: 03/25/2010
• Status: Active Grant

• Current Assignee: Hitachi, Ltd., Hitachi Chemical Company Limited (Resonac Holdings Corp.)
• Original Assignee: Hitachi, Ltd., Hitachi Chemical Company Limited (Resonac Holdings Corp.)
• Inventors: Tachizono, Shinichi, Naito, Takashi, Aoyagi, Takuya, Yoshimura, Kei, Hashiba, Yuji
• Granted Patent: US 9,142,708 B2
• Time in Patent Office: Days
• US Class Current: 136/252
• CPC Class Codes: C03C 8/00 Enamels; Glazes; Fusion seal compositions being frit compositions having non-frit additions
• CPC Class Codes: H01B 1/22 the conductive material comprising metals or alloys
• CPC Class Codes: H01L 31/022425 for solar cells
• CPC Class Codes: H01L 31/1804 comprising only elements of Group IV of the Periodic Table
• CPC Class Codes: Y02E 10/547 Monocrystalline silicon PV cells
• CPC Class Codes: Y02P 70/50 Manufacturing or production processes characterised by the final manufactured product

Abstract

Disclosed is a constitution formed from an oxide of an element having a smaller work function than aluminum. This oxide is comprises an oxide of vanadium (V), an oxide of an alkaline earth metal and an oxide of an alkali metal. The elements for the alkaline earth metal are comprise one or more elements out of the elements calcium (Ca), strontium (Sr) and barium (Ba) and at least contain barium. The elements for the alkali metal include at least one or more of sodium (Na), potassium (K), rubidium (Rb) and cesium (Cs). When the element vanadium is included as vanadium pentoxide (V₂O₅), the vanadium pentoxide content is 40-70 wt %. Thus, a glass composition for aluminum electrode wiring with an apparent work function for electrode wiring that is smaller than the work function for aluminum (Al) can be provided without the inclusion of lead.

Claims

1. A glass composition for an aluminum (Al) electrode wire, comprising:

an oxide/oxides of an element/elements with a work function smaller than a work function of aluminum.

2. The glass composition for an aluminum electrode wire according to claim 1, wherein the glass composition is free from an oxide of an element with a work function larger than a work function of aluminum unless the element is essential.

3. The glass composition for an aluminum electrode wire according to claim 1, wherein the oxides of the elements with a work function smaller than the work function of aluminum contains at least an oxide of vanadium (V), an oxide/oxides of an alkaline-earth metal/alkaline-earth metals, and an oxide/oxides of an alkali metal/alkali metals.

4. The glass composition for an aluminum electrode wire according to claim 3, wherein, as an element/elements of the alkaline-earth metal/alkaline-earth metals, at one or more elements of calcium (Ca), strontium (Sr), and barium (Ba) are contained, at least barium being contained,

and wherein, as an element/elements of the alkali metal/alkali metals, one or more elements of sodium (Na), potassium (K), rubidium (Rb), and cesium (Cs) are contained.

5. The glass composition for an aluminum electrode wire according to claim 4,

wherein, in case that element vanadium is contained as vanadium pentoxide (V₂O₅), vanadium pentoxide is contained by 40 to 70 weight %,

wherein element Rn being an alkaline-earth metal is contained as an oxide represented by a chemical formula RnO, the oxide represented by the chemical formula RnO is contained by 20 to 40 weight %,

and wherein element R being an alkali metal is contained as an oxide represented by a chemical formula R2O, the oxide represented by the chemical formula R2O is contained by 10 to 20 weight %.

6. The glass composition for an aluminum electrode wire according to claim 1, wherein fine crystals are separated out inside the glass composition when the aluminum electrode wire is fired.

7. The glass composition for an aluminum electrode wire according to claim 1, wherein the glass composition crystallizes at a temperature lower than or equal to 500°

C., and softens and flows at a temperature lower than or equal to 700°

C.

8. The glass composition for an aluminum electrode wire according to claim 1, wherein the glass composition crystallizes at a temperature lower than or equal to 400°

C., and softens and flows at a temperature lower than or equal to 600°

C.

9. The glass composition for an aluminum electrode wire according to claim 1, wherein the glass composition is free from lead (Pb) in a component unless the component is essential.

10. A conductive paste for an aluminum electrode wire, a plurality of particles formed from aluminum and/or an alloy containing aluminum and powder formed from a glass composition being dispersed in a binder resin dissolved in a solvent,

wherein the glass composition for an aluminum electrode wire according to claim 1 is used as the glass composition forming the powder.

11. The glass composition for an aluminum electrode wire according to claim 10, wherein the powder is contained by 0.2 to 20 weight parts with respect to 100 weight parts of the particles.

12. The glass composition for an aluminum electrode wire according to claim 10, wherein the powder is contained by 0.2 to 2 weight parts with respect to 100 weight parts of the particles.

13. An electronic component provided with an aluminum electrode wire containing a plurality of particles formed from aluminum and/or an alloy containing aluminum and a glass composition for fixing the particles to a substrate,

wherein the glass composition for an aluminum electrode wire according to claim 1 is used as the glass composition for fixing the particles to the substrate.

14. The electronic component according to claim 13, wherein fine crystals are separated out in the glass composition.

15. The electronic component according to claim 13, wherein the glass composition is contained by 0.2 to 20 weight parts with respect to 100 weight parts of the particles.

16. The electronic component according to claim 13,

wherein the substrate includes a p-type semiconductor,

and wherein the aluminum electrode wire is formed on the p-type semiconductor.

17. The electronic component according to claim 16, wherein the substrate is a solar battery cell having a p-n junction.

18. The electronic component according to claim 13,

wherein the electronic component is a display panel.

19. A method for manufacturing an electronic component for which an aluminum electrode wire is formed by:

coating, on a substrate, a conductive paste in which a plurality of particles formed from aluminum and/or an alloy containing aluminum and powder formed from a glass composition that is formed from an oxide/oxides of an element/elements with a work function smaller than a work function of aluminum are dispersed in a binder resin dissolved in a solvent; and

firing the coated conductive paste.