Patent ID: 7411252

Claim:
A field effect transistor comprising: a substrate; a fin on said substrate, wherein said fin comprises: an upper semiconductor portion; and, a lower back gate portion, and wherein said lower back gate portion comprises: a back gate dielectric layer below said upper semiconductor portion; and a back gate electrode between said substrate and said back gate dielectric layer; a front gate adjacent a top surface and opposing sidewalls of said upper semiconductor portion of said fin and electrically isolated from said back gate electrode; an additional dielectric layer on said substrate and extending vertically along opposing sidewalls of said back gate electrode so as to electrically isolate said front gate from said back gate electrode, wherein said front gate comprises: a front gate dielectric layer on said top surface and on said opposing sidewalls of said upper semiconductor portion of said fin; and, a front gate electrode on said additional dielectric layer and said front gate dielectric layer.