Single-crystal – oriented-crystal – and epitaxy growth processes; – Forming from vapor or gaseous state – With a step of measuring – testing – or sensing
Reexamination Certificate
2003-05-19
2009-06-30
Hiteshew, Felisa C (Department: 1792)
Single-crystal, oriented-crystal, and epitaxy growth processes;
Forming from vapor or gaseous state
With a step of measuring, testing, or sensing
C117S108000, C118S7230VE, C148SDIG010, C148SDIG040
Reexamination Certificate
active
07553368
ABSTRACT:
A process for the manufacture of a gallium rich gallium nitride film is described. The process comprises (a) preparing a reaction mixture containing a gallium species and a nitrogen species, the gallium species and the nitrogen species being selected such that, when they react with each other, gallium nitride is formed; and (b) growing the gallium rich gallium nitride film from the reaction mixture, by allowing the gallium species to react with the nitrogen species and to deposit gallium nitride on a substrate selected from the group consisting of silicon, glass, sapphire, quartz and crystalline materials having a lattice constant closely matched to gallium nitride, including zinc oxide, optionally with a zinc oxide buffer layer, at a temperature of from about 480° C. to about 900 ° C. and in the presence of a gaseous environment in which the partial pressure of oxygen is less than 10−4Torr, wherein the ratio of gallium atoms to nitrogen atoms in the gallium rich gallium nitride film is from 1.01 to 1.20. The invention also provides the option of annealing the gallium rich gallium nitride film at a temperature of from about 20° C. to about 650° C. and for a time sufficient to decrease the resistivity of the film so that it becomes electrically conductive, for instance to a resistivity below 100 ohm·cm.
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Afifuddin Afifuddin
Butcher Kenneth Scott Alexander
Tansley Trevor Lionel
Gallium Enterprises Pty Ltd.
Hiteshew Felisa C
Knobbe Martens Olson & Bear LLP
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