# US 2008/0187651 A1 · Conductive ink formulations

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- Number: US 2008/0187651 A1
- Document ID: US20080187651A1
- Status: Published application
- Kind: A1
- Application number: 11/552,410
- Filed: 2006-10-24
- Published: 2008-08-07
- Earliest claimed: 2006-10-24
- Assignees: 3M Innovative Properties Company
- Inventors: Tzu-Chen Lee; Brian K. Nelson; Christopher P. Gerlach; Dennis E. Vogel
- Web page: https://patentgrep.com/patent/US20080187651A1

## CPC

- C09D 11/52: Electrically conductive inks
- H05K 1/097: {Inks comprising nanoparticles and specially adapted for being sintered at low temperature (H05K1/095 takes precedence)}
- H05K 2201/0329: Intrinsically conductive polymer [ICP]; Semiconductive polymer
- C09D: COATING COMPOSITIONS, e.g. PAINTS, VARNISHES OR LACQUERS; FILLING PASTES; CHEMICAL PAINT OR INK REMOVERS; INKS; CORRECTING FLUIDS; WOODSTAINS; PASTES OR SOLIDS FOR COLOURING OR PRINTING; USE OF MATERIALS THEREFOR (cosmetics A61K; processes for applying liquids or other fluent materials to surfaces, in general, B05D; staining wood B27K5/02; glazes or vitreous enamels C03C; natural resins, French polish, drying-oils, driers, turpentine, per se, C09F; polishing compositions other than French polish, ski waxes C09G; adhesives or use of materials as adhesives C09J; materials for sealing or packing joints or covers C09K3/10; materials for stopping leaks C09K3/12; processes for the electrolytic or electrophoretic production of coatings C25D)
- H05K: PRINTED CIRCUITS; CASINGS OR CONSTRUCTIONAL DETAILS OF ELECTRIC APPARATUS; MANUFACTURE OF ASSEMBLAGES OF ELECTRICAL COMPONENTS

## Abstract

Conductive ink formulations comprising a conductive polymer, metallic nanoparticles and a carrier are described. The formulations are printable on a surface, and annealed to form source and drain electrodes.

## Claims

### Claim 1

An ink formulation comprising:
a) at least one conductive polymer;
b) metallic nanoparticles dispersed within the conductive polymer, wherein the weight ratio of the conductive polymer to the metallic nanoparticles ranges from 1:3 to 1:1; and
c) a carrier for mixing the conductive polymer and the metallic nanoparticles, the carrier being a solvent for the conductive polymer.

### Claim 2 (depends on 1)

The ink formulation of claim 1, further comprising a dopant of at least one of sorbitol and glycerol.

### Claim 3 (depends on 1)

The ink formulation of claim 1, wherein the conductive polymer is selected from the group consisting of poly(3,4-ethylenedioxythiophene)/poly(styrene sulfonate), polyaniline, polypyrrole, and combinations thereof

### Claim 4 (depends on 2)

The ink formulation of claim 2, wherein the conductive polymer is poly(3,4-ethylenedioxythiophene)/poly(styrene sulfonate) and the dopant is sorbitol.

### Claim 5 (depends on 1)

The ink formulation of claim 1, wherein the metallic nanoparticles are selected from the group consisting of silver, aluminum, copper, nickel and combinations thereof.

### Claim 6 (depends on 1)

The ink formulation of claim 1, wherein the metallic nanoparticles have an average particle size less than about 500 nm.

### Claim 7 (depends on 1)

The ink formulation of claim 1, wherein the metallic nanoparticles have an average particle size less than about 100 nm.

### Claim at position 8

8-11. (canceled)

### Claim 12 (depends on 19)

An organic electronic device comprising an electrode formed by an annealed ink formulation of claim 19.

### Claim 13 (depends on 12)

The organic electronic device of claim 12, wherein the device comprises a transistor.

### Claim 14 (depends on 13)

The transistor of claim 13 comprising at least one of a source and drain electrode.

### Claim 15 (depends on 13)

The transistor of claim 13, wherein the annealed ink formulation further comprises a dopant selected from sorbitol and glycerol.

### Claim 16 (depends on 14)

The transistor of claim 14, further comprising a semiconductor layer disposed on at least one of the source and drain electrodes.

### Claim 17 (depends on 16)

The transistor of claim 16, wherein the semiconductor layer comprises 6,13-bis[(triisopropylsilanyl)ethynyl]pentacene.

### Claim 18 (depends on 13)

An electronic device comprising a multiplicity of the transistors of claim 13.

### Claim 19 (depends on 1)

A method for forming an electrode of an electronic device comprising the steps of applying the ink formulation of claim 1, and annealing.

### Claim 20 (depends on 19)

The method of claim 19, wherein the step of applying includes ink jet printing, screen printing, gravure printing, flexographic printing, contact printing, or spraying.

### Claim 21 (depends on 19)

The method of claim 19, wherein the annealing temperature ranges from 100° C. to 175° C.