Method and apparatus for producing large, single-crystals of aluminum nitride
Number of patents in Portfolio can not be more than 2000
United States of America Patent
Stats
-
N/A
Issued Date -
Jan 12, 2006
app pub date -
Aug 3, 2004
filing date -
Dec 24, 2001
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A method and apparatus for producing bulk single crystals of AlN having low dislocation densities of about 10,000 cm.sup.-2 or less includes a crystal growth enclosure with Al and N.sub.2 source material therein, capable of forming bulk crystals. The apparatus maintains the N.sub.2 partial pressure at greater than stoichiometric pressure relative to the Al within the crystal growth enclosure, while maintaining the total vapor pressure in the crystal growth enclosure at super-atmospheric pressure. At least one nucleation site is provided in the crystal growth enclosure, and provision is made for cooling the nucleation site relative to other locations in the crystal growth enclosure. The Al and N.sub.2 vapor is then deposited to grow single crystalline low dislocation density AlN at the nucleation site. High efficiency ultraviolet light emitting diodes and ultraviolet laser diodes are fabricated on low defect density AlN substrates, which are cut from the low dislocation density AlN crystals. Bulk crystals of ZnO may also be produced using the method.
First Claim
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