Device chip carriers, modules, and methods of forming thereof
View Patent ↗The present invention provides novel methods of forming component carriers, component modules, and the carriers and modules formed therefrom which utilize thick film technology. In some embodiments, these methods are used to form lighting device chip carriers and modules. In further embodiments, these lighting device chip carriers and modules are used in LED applications.
1. A method of forming a chip carrier comprising:
providing a base material having lower and upper opposing surfaces;
providing a dielectric thick film composition comprising 3% ethyl cellulose, 4% terpineol, 4% dibuyl phthalate, 85% inorganic phase in weight percent of the composition;
applying said dielectric thick film composition to said upper surface of said base material;
firing said dielectric thick film composition and said base material at a firing temperature such that the dielectric forms a glass/ceramic composite, thus forming a structure comprising a fired base layer and a fired dielectric layer; and
applying a conductive layer at least partially covering said dielectric layer, and wherein said base material upper surface is oxidized,
wherein the fired film has no conductivity.
2. The method of claim 1 wherein said base material is selected from the group consisting of aluminum, oxidized aluminum, alloys of aluminum, diamond-like carbon/aluminum, copper, a metal matrix of aluminum, copper, a metal matrix of aluminum/carbon/fiber composites.
3. The method of claim 1 wherein said dielectric thick film composition is selected from the group comprising a thick film paste composition and a thick film tape composition and wherein said firing temperature is in the range of 450° C. to 600° C.
4. The method of claim 1 further comprising drying the dielectric thick film composition prior to firing.
5. The method of claim 1 wherein said conductive layer is a thick film paste composition.
6. The method of claim 2 wherein said upper surface comprises oxidized metal selected from the group consisting of aluminum, titanium, tantalum, and zirconium.
7. The method of claim 1 wherein said chip carrier is a light emitting diode chip carrier.
8. A method of forming a chip carrier comprising:
providing a base material having lower and upper opposing surfaces and oxidizing said base material upper surface;
providing a dielectric thick film composition;
applying said dielectric thick film composition to said upper surface of said base material;
firing said dielectric thick film composition and said base material at a firing temperature in the range of 450° C. to 600° C. wherein the dielectric forms a glass/ceramic composite, thus forming a structure comprising a fired base layer and a fired dielectric layer;
applying a conductive layer at least partially covering said dielectric layer;
firing said conductive layer;
providing at least one component;
applying a component attachment material to said dielectric layer;
placing said component on said component attachment material; and
connecting said component to said conductive layer;
wherein the fired film has no conductivity.
9. The method of claim 8 further comprising drying the dielectric thick film composition prior to firing.
10. The method of claim 8 wherein said component is connected to said conductive layer with a material selected from the group consisting of: two or more wire bonds; solder material; and conductive die attach materials, including but not limited to conductive epoxy material.
11. The method of claim 8 wherein said component attachment material is untouched by said conductive layer.
12. The method of claim 8 wherein said conductive layer comprises Ag.
13. The method of claim 8 further comprising applying an encapsulant to partially cover said conductive layer.
14. The method of claim 8 wherein said conductive layer is plated with a Ni—Au layer.
15. The method of claim 8 wherein the dielectric thick film composition and the conductive layer are fired in one step.
16. The method of claim 8 wherein said chip carrier is a light emitting diode chip module.
17. A light emitting diode chip carrier formed by the method of claim 1 .
18. A light emitting diode chip module formed by the method of claim 8 .