DEVICE APPLICATIONS FOR VOLTAGE SWITCHABLE DIELECTRIC MATERIAL HAVING HIGH ASPECT RATIO PARTICLES

• US 20100139956A1
• Filed: 02/10/2010
• Published: 06/10/2010
• Est. Priority Date: 07/29/2006
• Status: Active Grant

• Current Assignee: Littelfuse Incorporated
• Original Assignee: Shocking Technologies, Inc.
• Inventors: Kosowsky, Lex, Fleming, Robert
• Granted Patent: US 7,968,014 B2
• Time in Patent Office: Days
• US Class Current: 174/257
• CPC Class Codes: B82Y 10/00 Nanotechnology for information processing, storage or transmission, e.g. quantum computing or single electron logic
• CPC Class Codes: H01B 1/22 the conductive material comprising metals or alloys
• CPC Class Codes: H01B 1/24 the conductive material comprising carbon-silicon compounds, carbon or silicon
• CPC Class Codes: H01C 17/0652 containing carbon or carbides
• CPC Class Codes: H01C 7/1006 Thick film varistors
• CPC Class Codes: H01C 7/105 Varistor cores H01C7/12 takes precedence
• CPC Class Codes: H05K 1/0257 Overvoltage protection
• CPC Class Codes: H05K 1/0259 Electrostatic discharge [ESD] protection
• CPC Class Codes: H05K 1/0373 containing additives, e.g. fillers H05K1/036 takes precedence
• CPC Class Codes: H05K 1/167 incorporating printed resistors
• CPC Class Codes: H05K 2201/0248 Needles or elongated particles; Elongated cluster of chemically bonded particles
• CPC Class Codes: H05K 2201/0257 Nanoparticles
• CPC Class Codes: H05K 2201/026 Nanotubes or nanowires
• CPC Class Codes: H05K 2201/0272 Mixed conductive particles, i.e. using different conductive particles, e.g. differing in shape
• CPC Class Codes: H05K 2201/0738 Use of voltage responsive materials, e.g. voltage switchable dielectric or varistor materials
• CPC Class Codes: H05K 2203/0723 Electroplating, e.g. finish plating
• CPC Class Codes: H05K 2203/105 Using an electrical field; Special methods of applying an electric potential
• CPC Class Codes: H05K 3/188 by direct electroplating
• CPC Class Codes: Y10S 977/742 Carbon nanotubes, CNTs
• CPC Class Codes: Y10S 977/779 Possessing nanosized particles, powders, flakes, or clusters other than simple atomic impurity doping
• CPC Class Codes: Y10T 428/30 : Self-sustaining carbon mass or layer with impregnant or other layer
• CPC Class Codes: Y10T 428/31678 : Of metal

Abstract

One or more embodiments provide for a device that utilizes voltage switchable dielectric material having semi-conductive or conductive materials that have a relatively high aspect ratio for purpose of enhancing mechanical and electrical characteristics of the VSD material on the device.

Claims

1. A device comprising:

a formation of voltage switchable dielectric (VSD) material, wherein the VSD material comprises;

a binder;

high aspect ratio (HAR) particles that are conductive or semi-conductive and dispersed as nanoscale particles within the binder; and

conductor and/or semiconductor particles;

said conductor and/or semiconductor particles being distributed in the binder;

wherein HAR particles and said conductor and/or semiconductor particles are combined to provide said composition with a characteristic of being (i) dielectric in absence of a voltage that exceeds a characteristic voltage level, and (ii) conductive with application of said voltage exceeding said characteristic voltage level.

2. The device of claim 1, wherein the conductive organic material and the conductor or semiconductor particles the formation of VSD material are substantially uniformly distributed in an overall thickness of the binder.

3. The device of claim 2, wherein the organic material the formation of VSD material includes single and/or multi-walled carbon nanotubes.

4. The device of claim 1, wherein the device corresponds to a printed circuit board.

5. The device of claim 4, wherein the formation of VSD material is provided as a layer within the substrate device.

6. The device of claim 4, wherein the formation of VSD material is provided as trace elements on a surface of the substrate device.

7. The device of claim 1, wherein the device is a device selected from a group consisting of a discrete device, a semi-conductor package, a display device or backplane, a light-emitting diode, and a radio-frequency identification device.

8. The device of claim 1, wherein said organic material of the formation of VSD material includes a pure carbon compound corresponding to one of carbon graphite, carbon fiber, or a diamond powder.

9. The device of claim 1, wherein the conductor and/or semiconductor particles the formation of VSD material includes a metal or a metal complex.

10. An electronic device comprising:

a layer of voltage switchable dielectric (VSD) material formed by;

(i) creating a mixture comprising a binder, metallic and/or inorganic semi-conductor particles, and conductive or semi-conductive organic material;

(ii) applying the mixture to a target location on the device; and

(iii) curing the mixture at the target location.