Patent ID: 6656783
Filing Date: 2003-12-02
Classification: H01L

Abstract:
A method of manufacturing a semiconductor device having an STI structure, comprising:forming a first trench and a second trench in selective areas of a semiconductor substrate; forming a first sidewall oxide layer on an inner surface of the first trench and a second sidewall oxide layer on an inner surface of the second trench, the second sidewall oxide layer having a thickness less than the first sidewall oxide layer; forming a liner on surfaces of the first and second sidewall oxide layers; and filling the first and second trenches with a dielectric material, wherein forming the first and second sidewall oxide layers comprises: forming an initial oxide layer on the inner surfaces of the first and second trenches: selectively removing the initial oxide layer in the second trench; and forming a first sidewall oxide layer and a second sidewall oxide layer by oxidizing the initial oxide layer in the first trench and the inner surface of the second trench.