Patent ID: 11164949

Abstract:
A semiconductor structure and a formation method thereof are provided. The formation method includes: providing a substrate and a fin, a gate structure being formed on the substrate, the gate structure spanning the fin and covering a partial sidewall and a partial top of the fin, and a source/drain doping region being formed in the fin on both sides of the gate structure; forming a first dielectric layer on the substrate, the first dielectric layer exposing the top of the fin; forming an etch stop layer to conformally cover the first dielectric layer and the fin and the source/drain doping region exposed by the first dielectric layer; forming a second dielectric layer on the etch stop layer; and forming a conductive plug penetrating through the second dielectric layer and the etch stop layer, the conductive plug spanning the fin, and the conductive plug being connected to the source/drain doping region. Under the action of a first dielectric layer, the effective area between a conductive plug and a gate structure is reduced, and the parasitic capacitance between a conductive plug and a device gate structure is reduced accordingly.