Patent ID: 7560347

Claim:
A method for forming a wrap-around-gate field-effect transistor in a layered structure including a handle wafer, a first oxide layer on the handle wafer, a second oxide layer, and a semiconductor island between the first oxide layer and the second oxide layer, the method comprising: structure including a silicon island between a first oxide layer and a second oxide layer; forming a vertical cavity in the SOI structure extending from a top surface of the second oxide layer through the second oxide layer, the semiconductor island, and the first oxide layer to the handle wafer; isotropically etching the first oxide layer and the second oxide layer within the cavity to expose surface portions of the semiconductor island that are aligned generally parallel to the top surface of the second oxide layer and that extend about a circumference of the semiconductor island; depositing a gate conductor material on the surface portions of the semiconductor island; and isotropically etching the gate conductor material to recess the gate conductor material laterally relative to the surface portions of the semiconductor island to form a wrap-around gate electrode extending entirely around a surface periphery of the silicon island such that a portion of the gate electrode is disposed in a gap between the semiconductor island and the handle wafer.