Preparation method for complementary metal oxide semiconductor element with dual metal grid

Abstract

The invention discloses a production method of a CMOS element with bimetal grids. The method comprises: a first conductive transistor and a second conductive transistor are formed respectively on a substrate that is provided with a first active area, a second active area and a shallow trench isolation providing an electric isolation; a metal silicide technology is carried out; an internal dielectric layer is formed on the substrate; a first etching technology is carried out; a part of grid of the first conductive transistor is removed and an opening is formed; and a high-dielectric constant gird dielectric layer of the first conductive transistor is exposed on the bottom of the opening, and a first metal layer is formed in the opening.

Description

technical field [0001] The present invention relates to a manufacturing method of a complementary metal-oxide semiconductor (hereinafter referred to as CMOS) element with a dual metal gate, especially a gate last ) process with a double metal gate CMOS element manufacturing method. Background technique [0002] As the size of CMOS devices continues to shrink, the traditional method of reducing the gate dielectric layer, such as reducing the thickness of the silicon dioxide layer, to achieve the purpose of optimization, is facing problems caused by the tunneling effect of electrons. Physical limitation of excessive leakage current. In order to effectively extend the generation evolution of logic elements, high dielectric constant (hereinafter referred to as High-K) materials can effectively reduce the physical limit thickness, and at the same equivalent oxide thickness (equivalent oxide thickness, hereinafter referred to as EOT) Under the advantages of effectively reducing ...

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Problems solved by technology

[0004] Dual-function metal gates are either paired with NMOS elements or PMOS elements, which makes the integration technology and process control of related elements more complicated, and the thickness and composition control requirements of each material are also more stringent.

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