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A method for reducing the surface defect density of silicon carbide epitaxy

A defect density, silicon carbide technology, applied in the manufacture of electrical components, circuits, semiconductor/solid-state devices, etc., to achieve the effect of reducing surface defect density, simple and easy epitaxy, and uniform in-situ etching

Active Publication Date: 2020-09-22
NO 55 INST CHINA ELECTRONIC SCI & TECHNOLOGYGROUP CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, after the conventional etching process, there are still a certain amount of surface defects introduced by the substrate on the surface of the epitaxial wafer after epitaxy

Method used

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  • A method for reducing the surface defect density of silicon carbide epitaxy
  • A method for reducing the surface defect density of silicon carbide epitaxy

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Embodiment Construction

[0023] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0024] Such as figure 1 As shown, the method for reducing the surface defect density of silicon carbide epitaxy described in the present invention comprises steps:

[0025] (1) Place the cleaned SiC substrate on the pedestal in the chemical vapor deposition (CVD) equipment. The silicon carbide substrate can be a 3-8 inch silicon carbide substrate that is 4° to the direction;

[0026] (2) set reaction chamber pressure to be 80-150mbar, hydrogen (H 2 ) The flow rate is 80-150L / min, and the system heats up to a temperature of 1400-1500°C;

[0027] (3) Keep the temperature and reaction chamber pressure constant, and perform pure hydrogen etching on the substrate for 1-10 minutes;

[0028] (4) Keep the pressure and H 2 The flow rate is constant, and a small flow rate of argon (Ar) is introduced into the reaction chamber to ass...

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Abstract

The invention discloses a method for reducing the density of silicon carbide epitaxial surface defects, a silicon carbide substrate is treated by in-situ composite etching with hydrogen-argon mixed atmosphere before epitaxial growth, by introducing relatively mild argon gas, the problem of large surface damage caused by pure hydrogen etching is solved, compared with pure hydrogen etching, the temperature field is more uniform, and the surface instability of the substrate in the initial epitaxial stage is reduced or even eliminated while the damaged layer introduced by the chemical mechanical polishing of the substrate is effectively treated, so that the defects of the surface extended into the epitaxial layer due to the substrate are greatly reduced, and the surface defect density in the epitaxial layer can be effectively reduced. The method of the invention is simple, feasible and compatible with the existing epitaxial process, and has high popularization value.

Description

technical field [0001] The invention belongs to the technical field of semiconductor epitaxy materials, in particular to a method for reducing the surface defect density of silicon carbide epitaxy. Background technique [0002] Among the third-generation wide-bandgap semiconductor materials, silicon carbide (SiC) has excellent physical and electrical properties such as wide-bandgap, high breakdown field strength, and high thermal conductivity, making it widely used in high-temperature, high-voltage, and high-frequency devices. It has a very broad application prospect. 4H-SiC is the material with the best performance among SiC polytypes. It has a larger band gap, bulk electron mobility, and smaller anisotropy. It is the material of choice for the development of power electronic devices. [0003] At present, SiC power electronic devices have been widely used in hybrid electric vehicles, electric vehicle equipment, SiC device power modules, SiC inverter air conditioners, SiC i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L21/02H01L21/04
CPCH01L21/02378H01L21/02529H01L21/0262H01L21/02634H01L21/02661H01L21/0445
Inventor 赵志飞李赟王翼李忠辉
Owner NO 55 INST CHINA ELECTRONIC SCI & TECHNOLOGYGROUP CO LTD
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