Patent ID: 7700446

Claim:
A method of manufacturing a field effect transistor (FET), said method comprising: forming a first semiconductor layer on a substrate; forming a second semiconductor layer on said first semiconductor layer, said second semiconductor layer being different from said first semiconductor layer; performing a first etch process that etches said first semiconductor layer and said second semiconductor layer to form a rectangular-shaped body on said substrate; performing a second etch process that etches back sides of said first semiconductor layer to form, from said rectangular-shaped body, an essentially T-shaped body comprising a relatively narrow lower section on said substrate and a relatively wide upper section above said lower section; forming a first gate structure adjacent to said T-shaped body such that said first gate structure is positioned laterally adjacent to said lower section, is positioned between said substrate and said upper section and extends the length of said T-shaped body; and after said forming of said first gate structure, forming a second gate structure adjacent to said T-shaped body such that said second gate structure has a horizontal section traversing a top surface of said upper section and vertical sections extending from said substrate to said horizontal section.