Patent ID: 6953972

Claim:
A metal oxide semiconductor field effect transistor (MOSFET) structure on a semiconductor substrate, comprising; insulator filled shallow trench shapes comprised of underlying bottom portions featuring straight sides and extending from a level equal to the top surface of said semiconductor substrate downwards into a top portion of said semiconductor substrate, and with said insulator filled shallow trench shapes comprised with overlying top portions featuring tapered sides, and wherein said overlying top portions of said insulator filled shallow trench shapes extend upwards to a level between about 1000 to 2000 Angstroms above the level of the top surface of said semiconductor substrate; a composite semiconductor shape on a top surface of said semiconductor substrate, with said composite semiconductor shape featuring tapered sides, and located between said overlying top portions of said insulator filled shallow trench shapes; insulator filled V groove shapes located between said composite semiconductor shape and said overlying top portions of said insulator filled shallow trench shapes; a conductive gate structure on an underlying gate insulator, located on a portion of said top surface of said composite semiconductor shape; insulator spacers on sides of said conductive gate structure; and a source/drain region in a portion of said composite semiconductor substrate not covered by said conductive gate structure or by said insulator spacers, with said source/drain region extending into an underlying portion of said semiconductor substrate.