Semiconductor structure and forming method for thereof

Abstract

A semiconductor structure and a forming method thereof are provided, where one form of a forming method includes: providing a substrate, where the substrate includes a first region and a second region that are adjacent, stack structures are formed on the first region and the second region, and the stack structures of the first region and the second region and the substrate form a first opening; forming first dielectric layers on a bottom surface and side walls of the first opening, where a second opening is provided between the first dielectric layers; forming a second dielectric layer in the second opening; forming a source/drain doped layer; removing the first dielectric layer between the source/drain doped layer and the second dielectric layer, and forming a groove exposing a side wall, which is close to the second dielectric layer, of the source/drain doped layer; and forming a contact plug in the groove. In the embodiments of the present disclosure, the contact plug is in contact with a top surface of the source/drain doped layer as well as the side walls, which are close to the second dielectric layer and away from the second dielectric layer respectively, of the source/drain doped layer, so that a contact resistance between the contact plug and the source/drain doped layer is relatively small, thereby improving the electrical performance of the semiconductor structure.