TRANSISTOR STRUCTURE WITH DUAL TRENCH FOR OPTIMIZED STRESS EFFECT AND METHOD THEREOF

摘要

A method for forming a portion of a semiconductor device structure (30) comprises providing a semiconductor-on-insulator substrate having a semiconductor active layer (34), an insulation layer (32), and a semiconductor substrate. A first isolation trench (40) is formed within the semiconductor active layer and a stressor material (42) is deposited on a bottom of the first trench, wherein the stressor material includes a dual-use film. A second isolation trench (44) is formed within the semiconductor active layer, wherein the second isolation trench is absent of the stressor material on a bottom of the second trench. The presence and absence of stressor material in the first and second isolation trenches, respectively, provides differential stress: (i) on one or more of N-type or P-type devices of the semiconductor device structure, (ii) for one or more of width direction or channel direction orientations, and (iii) to customize stress benefits of one or more of a <100> or <110> semiconductor-on-insulator substrate.