METHOD FOR FORMING SUBSTRATE FOR MANUFACTURING SIGE/SI HETERO-JUNCTION FIELD EFFECT TRANSISTOR AND SUBSTRATE THEREOF

摘要

PURPOSE: A method for forming a substrate for manufacturing an SiGe/Si HFET(Hetero-junction Field Effect Transistor) and the substrate thereof are provided to be capable of obtaining a thin buffer layer having good device characteristics by carrying out an in-situ heat treatment. CONSTITUTION: After forming the first silicon germanium layer(12) having an inhomogeneous germanium constitution on a silicon epitaxial layer(10), a heat treatment is carried out at the resultant structure by in-situ. Then, the second silicon germanium layer(14) having a homogeneous germanium, is formed on the resultant structure. A silicon cap layer(16) is formed on the second silicon germanium layer. At the time, the first and second silicon germanium layer are used as a buffer layer.