Patent ID: 6812158
Filing Date: 2004-11-02
Classification: H01L,Y10S

Abstract:
A method of growing oxides of varying thicknesses on a semiconductor substrate comprising:implanting a first portion of the semiconductor substrate with a first dose of an oxide growth retardant; implanting a second portion of the semiconductor substrate with a second dose of an oxide growth retardant; oxidizing the semiconductor substrate in a first environment to grow a first oxide on the first portion and a second oxide on the second portion ensuring a third portion of the semiconductor substrate is not implanted with any oxide growth retardant; wherein a third oxide is grown on the third portion during oxidation;removing the third oxide from some part of the third portion of the semiconductor substrate; and oxidizing the semiconductor substrate in a second environment to grow a first additional oxide on the first portion, a second additional oxide on the second portion, and a new third oxide on the some part of the third portion.