Patent ID: 6812142
Filing Date: 2004-11-02
Classification: H01L

Abstract:
A fabrication method comprising the steps of:forming a dielectric structure over a contact region the dielectric structure comprising: a first layer formed from silicon nitride; a second layer overlying the first layer and formed from borophosphosilicate glass, wherein borophosphosilicate class may be selectively etched with respect to the silicon nitride; and a third layer underlying the first layer and formed from a silicate glass doped with a gettering agent; forming and patterning a resist layer over the dielectric structure; selectively etching the second layer through an opening through the patterned resist layer utilizing an etch which is selective of the first material over the second material; and without stripping the resist layer, etching the dielectric structure through the opening within the patterned resist layer and any etched region within the second layer to form a contact opening extending through the dielectric structure and exposing the contact region.