LATERAL SOI BIPOLAR MOS FIELD EFFECT TRANSISTOR HAVING TRENCH GATE AND METHOD OF FABRICATING THE SAME

摘要

PURPOSE: A horizontal-type SOI bipolar mode FET having a trench gate and a method for making the same are provided to achieve an enhanced electric characteristic, reduce a change of an element characteristic as well as an influence of a buried oxide layer. CONSTITUTION: A first conductive source area(40) is separated from a first conductive drain area(41), and they have a predetermined depth. A second conductive gate area is near to one area between the source and drain areas(40,41), insulates a gate plug deeper than the areas, and is contacted with a lower part of the trench. If the first conductive area is made of N-type impurity ion, the second conductive area is made of P-type ion. The gate plug is nearer to the source area, and is made of a polysilicon.