Patent ID: 6214737
Filing Date: 2001-04-10
Classification: H01L

Abstract:
A method of forming a conductive structure having a width of about 100 nm or less, comprising:providing a substrate having a conductive film;patterning a mask over a first portion of the conductive film wherein a second portion of the conductive film is exposed;partially etching the second portion of the conductive film to reduce the thickness of the second portion without completely removing the second portion thereby forming a lower step when compared to the first portion and a sidewall between the first portion and the lower step in the conductive film;removing the mask;depositing a sidewall film over the conductive film, the sidewall film having a vertical portion adjacent the sidewall of the conductive film and a horizontal portion in areas not adjacent the sidewall of the conductive film;removing the horizontal portion of the sidewall film exposing a third portion of the conductive film; andetching the third portion of the conductive film thereby providing the conductive structure having a width of about 100 nm or less underlying the vertical portion of the sidewall film.