International Business Machines Corporation
Top via structure with enlarged contact area with upper metallization level

Abstract:

Integrated circuits include back end of line metallization levels. An upper metallization level is on a lower metallization level and includes at least one top via-line interconnect structure in an interlayer dielectric. The lower metallization level includes at least one top via-line interconnect structure in an interlayer dielectric, wherein the top via is raised relative to the interlayer dielectric in the lower metallization level. The line in the upper metallization level contacts a top surface and sidewall portions of the top via raised above the interlevel dielectric. Also described are methods for fabricating the same.