Patent ID: 6521138
Filing Date: 2003-02-18
Classification: H01L

Abstract:
A method of determining the width of bottom under cut, comprising:forming an oxide line pattern above a substrate, controlling and measuring the thickness b of said oxide line pattern; depositing a deposition layer above said oxide line pattern and said substrate; forming a photoresist pattern above said deposition layer; etching said deposition layer to form a deposition pattern by using said photoresist pattern as a mask and leave a spacer on each side wall of said oxide line pattern, and measuring the width c of said spacer and the top width e of said deposition pattern; continuing etching to under cut said deposition pattern and remove a tail end of each spacer, and measuring the width d of said spacer after said tail end is removed; and determining the width of bottom under cut of said deposition pattern by computing the value of eâˆ’2(câˆ’d).