MOS transistor and its formation method

Abstract

The invention provides an MOS transistor and a forming method thereof. The forming method of the MOS transistor comprises the steps that a semiconductor substrate is provided; a gate structure is arranged on the surface of the semiconductor substrate; offset side walls are arranged at two sides of the gate structure; lightly doped drain injection is carried out on the semiconductor substrate at two sides of the gate structure to form lightly doped regions; a gap side wall is formed on the surface of each offset side wall; source-drain regions are formed on the semiconductor substrate at two sides of the gate structure; barrier layers are formed on the surfaces of the source-drain regions and are used for preventing ions from being implanted into the source-drain regions; the offset side walls and the gap side walls are removed by employing an etching process to form openings; and first halo implantation is carried out on the semiconductor substrate exposed from the openings to form first halo regions. By the forming method of the MOS transistor, the performance of the MOS transistor can be improved.

Description

technical field [0001] The invention relates to the field of semiconductor manufacturing, in particular to a MOS transistor and a forming method thereof. Background technique [0002] MOS (Metal-Oxide-Semiconductor) transistor is one of the most important elements in modern integrated circuits. The basic structure of MOS transistors includes: a semiconductor substrate; a gate structure located on the surface of the semiconductor substrate, and the gate structure includes : the gate dielectric layer on the surface of the semiconductor substrate and the gate electrode layer on the surface of the gate dielectric layer; the lightly doped region on the semiconductor substrate on both sides of the gate structure and the source and drain on the semiconductor substrate on both sides of the gate structure Area. [0003] The method for forming the MOS transistor is: providing a semiconductor substrate, forming a gate structure on the surface of the semiconductor substrate, the gate s...

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Problems solved by technology

[0004] MOS transistors formed with prior art techniques suffer from poorer performance and reliability as feature sizes shrink further

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