Patent ID: 6472300
Filing Date: 2002-10-29
Classification: B82Y,C30B,H01L,Y02E

Abstract:
A method of fabricating a p-n homojunction device without the inclusion of a low temperature buffer layer, the method utilizing HVPE techniques and comprising the steps of:locating a first Group III metal in a first source zone of a reaction chamber; locating a second Group III metal in a second source zone of said reaction chamber; locating at least one acceptor impurity metal in a third source zone of said reaction chamber; locating a substrate within a growth zone of said reaction chamber; heating said substrate to a first temperature, wherein said first temperature is greater than 900Â° C.; heating said first Group III metal to a second temperature; heating said second Group III metal to a third temperature; heating said at least one acceptor impurity metal to a fourth temperature; introducing a halide reaction gas into said first source zone to form a first halide metal compound; introducing said halide reaction gas into said second source zone to form a second halide metal compound; transporting said first and second halide metal compounds to said growth zone; introducing a reaction gas into said growth zone, said reaction gas containing at least one Group V element; growing a first III-V layer on said substrate, said first III-V layer formed by said reaction gas reacting with said first and second halide metal compounds, wherein said first III-V layer is an n-type III-V layer; discontinuing said step of transporting said second halide metal compound to said growth zone; growing a second III-V layer on said first III-V layer, said second III-V layer formed by said reaction gas reacting with said first halide metal compound, wherein said second III-V layer is an n-type III-V layer; transporting said at least one acceptor impurity metal to said growth zone; growing a third III-V layer on said second III-V layer, said third III-V layer formed by said reaction gas reacting with said first halide metal compound, wherein said third III-V layer contains said at least one acceptor impurity metal, and wherein said third III-V layer is a p-type III-V layer; resuming said step of transporting said second halide metal compound to said growth zone; and growing a fourth III-V layer on said third III-V layer, said fourth III-V layer formed by said reaction gas reacting with said first and second halide metal compounds, wherein said fourth III-V layer contains said at least one acceptor impurity metal, and wherein said fourth III-V layer is a p-type III-V layer.