Semiconductor structure and forming method thereof

Abstract

The invention discloses a semiconductor structure and a forming method thereof. The forming method comprises the steps of providing a substrate; forming a first interconnection line, a dielectric lamination layer covering the first interconnection line and a second dielectric layer covering the dielectric lamination layer on the substrate; forming a first interconnection groove located in the first area and a second interconnection groove located in the second area; forming a first hard mask layer for filling the first interconnection groove and a second hard mask layer for filling the second interconnection groove, wherein the etching resistance of the second hard mask layer is greater than that of the first hard mask layer; forming a first through hole penetrating through the first hard mask layer, the second dielectric layer and the dielectric laminated layer, and a second through hole penetrating through the second hard mask layer and the second dielectric layer; and forming a super through hole interconnection structure in the first through hole, a single-layer through hole interconnection structure in the second through hole and a third interconnection line in the first interconnection groove and the second interconnection groove. The interconnection performance of the semiconductor structure can be improved.

Description

technical field [0001] Embodiments of the present invention relate to the field of semiconductor manufacturing, and in particular, to a semiconductor structure and a method for forming the same. Background technique [0002] Existing semiconductor structures generally consist of a semiconductor substrate and a plurality of dielectric layers and conductive layers formed on the semiconductor substrate. Specifically, multiple dielectric layers may be formed on the substrate by forming another dielectric layer on one dielectric layer, and each dielectric layer includes at least one metal line, and each of the at least one metal line includes A dielectric layer may be referred to as a metal layer. Existing semiconductor structures are generally composed of many metal layers, and metal lines in adjacent metal layers are usually electrically connected to each other through a via (Via) interconnection structure. [0003] With the rapid growth of the semiconductor integrated circui...

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Problems solved by technology

[0004] However, it is still a big challenge to form a super via interconnection structure

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