Patent ID: 7222419
Filing Date: 2007-05-29
Classification: H01L,H05K,Y10T

Abstract:
1. A method of fabricating a ceramic substrate, wherein the method comprises: providing a plurality of green tapes; forming a plurality of conductive openings and thermal conductive openings passing through the green tapes; after forming the conductive openings and the thermal conductive openings, filling a metal paste into the conductive openings and the thermal conductive openings; after filling the metal paste into the conductive openings and the thermal conductive openings, stacking the green tapes together, wherein the metal paste inside the conductive openings of every green tape is in contact with neighboring metal paste within the conductive openings of the green tapes, the metal paste inside the thermal conductive openings of each green tape is in contact with the neighboring metal paste inside the thermal conductive openings; after stacking the green tapes together, cofiring the green tapes and the metal paste to form a pre-substrate, wherein the pre-substrate comprises an insulating structure, a plurality of thermal conductive plugs and conductive plugs, the insulating structure is formed by cofiring the green tapes so that a plurality of conductive plugs are formed by cofiring the metal paste in the conductive openings and a plurality of thermal conductive plugs are formed by cofiring the metal paste inside the thermal conductive openings, the pre-substrate further comprises a top surface and a bottom surface; performing a planarization process after cofiring the green tapes and the metal paste; forming a first metal film on the top surface of the pre-substrate; forming a second metal film on the bottom surface of the pre-substrate; patterning the first metal film to form a plurality of die pads and conductive traces, the die pads in contacted with the thermal conductive plugs and the conductive traces in contacted with the conductive plugs; adhering a plurality of chips on the die pads; and electrically connecting the chips to the conductive traces.