Patent ID: 6660083
Filing Date: 2003-12-09
Classification: C23C,C30B,H01L

Abstract:
A method of epitaxially growing a Group III nitride semiconductor device in a single epitaxial growth run, the method utilizing HVPE techniques and comprising the steps of:locating a first gallium (Ga) source in a source boat within a first source zone of an HVPE reactor, said first Ga source having a first exposed surface area; locating a second Ga source in a quartz channel within a second source zone of said HVPE reactor, said Ga source having a second exposed surface area, wherein said second exposed surface area is less than said first exposed area; locating a substrate within a growth zone of said HVPE reactor, wherein said growth zone is maintained at a first temperature; heating said first Ga source to a second temperature; heating said second Ga source to a third temperature; introducing a halide reaction gas into said first source zone to form a first gallium chloride compound; transporting said first gallium chloride compound to said growth zone; transporting a reaction gas to said growth zone, said reaction gas containing nitrogen (N); reacting said first gallium chloride compound with said reaction gas to achieve a first epitaxial growth rate of greater than 0.1 microns per hour; growing a first Group III nitride layer to a thickness of greater than 5 microns; transferring said substrate to a growth interruption zone maintained at a fourth temperature, wherein said fourth temperature is within 50Â° C. of said first temperature; directing an inert gas in a flow direction that substantially prevents said first gallium chloride compound and said reaction gas from entering said growth interruption zone; purging said growth zone; introducing said halide reaction gas into said second source zone to form a second gallium chloride compound; transporting said second gallium chloride compound to said growth zone; reacting said second gallium chloride compound with said reaction gas to achieve a second epitaxial growth rate of less than 0.1 microns per hour; and growing a second Group III nitride layer to a thickness of less than 0.02 microns.