Patent ID: 8291966

Claim:
A method of cooling a microelectronic device, comprising: providing a microelectronic substrate of the microelectronic device, the substrate having: a first surface; a second surface with a plurality of surface features; and a plurality of active devices formed in the substrate, wherein the surface features are not configured to provide electrical communication between the microelectronic substrate and components external to the microelectronic substrate, and wherein the surface features are integrally formed in the substrate at the second surface and at least partially define multiple individual first heat transfer volumes between corresponding heat transfer features; and transferring heat from the active devices to a first fluid thermal conductor disposed in the individual first heat transfer volumes; and transferring heat from the first fluid thermal conductor to a second fluid thermal conductor disposed within a second heat transfer volume of a heat transfer system, wherein a surface of the second heat transfer volume is connected to the second surface of the substrate and seals the individual first heat transfer volumes from the second heat transfer volume.