Patent ID: 6245144
Filing Date: 2001-06-12
Classification: C30B

Abstract:
A method of controlling relative amounts of silicon dopant inside and outside of enhanced growth regions on an indium phosphide substrate using a metalorganic chemical vapor deposition (MOCVD) process, comprising the steps of:(a) positioning the indium phosphide substrate in a reactor chamber;(b) defining an enhanced growth region on the substrate by depositing a dielectric mask on the substrate;(c) introducing, into the reactor chamber, a first gas containing a metalorganic compound comprising indium and a hydrogen carrier gas at a first flow rate, and a second gas containing a phosphide and a doping gas containing a silicon dopant at a second flow rate;(d) mixing the introduced first gas with the introduced second gas and forcing the mixed gases over the substrate in a laminar flow with a mixed convection parameter of between about 0.31 and 0.33;(e) growing an n-type indium phosphide epitaxial layer inside and outside of the enhanced growth region on the substrate in the reactor chamber by reacting the first gas with the second gas and thermally decomposing the doping gas; and(f) controlling a silicon reduction ratio of the n-type indium phosphide epitaxial layer in the areas on the substrate inside and outside of the enhanced growth region by adjusting at least one of a temperature of the indium phosphide substrate and the first and second flow rates during said step (e).