Sapphire substrates and methods of making same

Details Sapphire substrates and methods of making same Sapphire substrates and methods of making same

2011-06-07

2011-06-07

Zarneke, David A (Department: 2891)

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

Semiconductor is an oxide of a metal or copper sulfide

C257SE29100

Reexamination Certificate

active

07956356

ABSTRACT:
A sapphire substrate includes a generally planar surface having a crystallographic orientation selected from the group consisting of a-plane, r-plane, m-plane, and c-plane orientations, and having a nTTV of not greater than about 0.037 μm/cm2, wherein nTTV is total thickness variation normalized for surface area of the generally planar surface, the substrate having a diameter not less than about 9.0 cm.

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