Alumina substrate and method of making an alumina substrate

Details Alumina substrate and method of making an alumina substrate Alumina substrate and method of making an alumina substrate

2011-08-30

2011-08-30

Dickey, Thomas L (Department: 2893)

Active solid-state devices (e.g., transistors, solid-state diode

Incoherent light emitter structure

With housing or contact structure

C257SE33058

Reexamination Certificate

active

08008682

ABSTRACT:
An alumina substrate and method of making an alumina substrate using oxidation is provided. Generally, photoresist masks are used to protect selected areas of an aluminum layer. The unprotected or exposed areas of the aluminum layer are then oxidized during a photolithography process. The protected, unexposed areas of the aluminum layer retain their conductive properties while the oxidized areas are converted to alumina, or aluminum oxide, which is non-conductive. Accordingly, an alumina substrate having conductive areas of aluminum is formed. In one embodiment, the alumina substrate includes an alumina layer, one or more aluminum vias formed within the alumina layer, each of the one or more aluminum vias extending between the bottom of the alumina layer and the top of the alumina layer, wherein the one or more aluminum vias are integrally formed within the alumina layer.

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