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A method for preparing graphene and graphene devices by epitaxy on a pretreated sic substrate

A graphene and pretreatment technology, applied in the field of microelectronic materials, can solve the problems of reducing growth rate, random microscopic nucleation sites, etc., and achieve the effects of improving quality, high-quality surface morphology, and high safety factor

Active Publication Date: 2021-11-26
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in the above process, the growth rate is only reduced on the macroscopic scale, and the problem of random microscopic nucleation sites cannot be solved.

Method used

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  • A method for preparing graphene and graphene devices by epitaxy on a pretreated sic substrate
  • A method for preparing graphene and graphene devices by epitaxy on a pretreated sic substrate
  • A method for preparing graphene and graphene devices by epitaxy on a pretreated sic substrate

Examples

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Embodiment 1

[0051] A method for preparing graphene and graphene devices by pretreatment of SiC substrate epitaxy, comprising steps as follows:

[0052] (1) Hydrogen etching

[0053] The SiC wafer obtained by cutting, grinding, mechanical polishing and chemical mechanical polishing of the SiC block has regular atomic-level steps on the surface, and is then cleaned by RCA standard cleaning method. Introduce hydrogen gas into the furnace cavity for hydrogen etching. The hydrogen etching temperature is 1600°C, the hydrogen flow rate is 50 sccm, the argon gas flow rate is 800 sccm, the pressure is 900 mbar, and the hydrogen etching time is 30 minutes; after that, vacuuming is performed, and the vacuum degree is 5×10 -5 Pa; completely pump out the gas in the furnace chamber;

[0054] (2) oxidation

[0055] Perform pre-oxidation treatment on the wafer after hydrogen etching, the oxygen flow rate is 20 sccm, the argon gas flow rate is 800 sccm, the chamber pressure is 800 mbar, the temperature ...

Embodiment 2

[0061] A method for preparing graphene and graphene devices by pretreatment of SiC substrate epitaxy, comprising steps as follows:

[0062] As described in Example 1, the difference is that the growth surface used is the (000-1) carbon surface of SiC, the SiC wafer is placed in the furnace chamber, and then the oxidation treatment process is carried out, the oxidation temperature is 500°C, and the oxygen flow rate 50sccm, oxidation treatment time 60min; graphene growth temperature 1450°C, growth time 120min.

[0063] The epitaxially grown graphene wafer on the SiC substrate is subjected to metal evaporation, photolithography and integration procedures, and finally the corresponding MOSFET device is prepared, and the carrier mobility of the obtained SiC epitaxial graphene is ~10000cm 2 ·V -1 ·s -1 .

Embodiment 3

[0065] A method for preparing graphene and graphene devices by pretreatment of SiC substrate epitaxy, comprising steps as follows:

[0066] As described in Example 1, the differences are: oxidation temperature 1300°C, oxygen flow 5sccm, oxidation treatment time 120min; graphene growth temperature 1700°C, growth time 30min; temperature rise rate to reach the target growth temperature 5°C / min, During the cooling process, the cooling rate was 5°C / min. The number of layers of the grown graphene is uniform, and its morphology is as follows: Figure 5 shown.

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Abstract

The invention relates to a method for epitaxially preparing graphene and graphene devices by pretreating SiC substrates. It includes the steps of: performing hydrogen etching on the SiC substrate, and then performing oxidation treatment on the SiC substrate after hydrogen etching, at a temperature of 800-1300° C., and a treatment time of 15-120 minutes; The temperature of the substrate is raised to 1450-1700°C for graphene growth. The present invention passivates the surface of SiC through oxidation pretreatment, reduces the nucleation density of SiC substrate epitaxial growth graphene, thereby obtains the graphene material with larger size and better performance, and on this basis SiC epitaxial graphene The wafer undergoes deposition, photolithography, doping and integration procedures to prepare corresponding graphene devices.

Description

technical field [0001] The invention relates to a method for preparing graphene and graphene devices by epitaxial pretreatment of SiC substrates, in particular to a method for epitaxially growing large crystal domains and high-quality graphene based on large-diameter 4H / 6H-SiC substrates, belonging to microelectronic materials technology field. Background technique [0002] Graphene is made of carbon atoms with sp 2 The atomic-level two-dimensional crystal material of the hexagonal honeycomb lattice formed by orbital hybridization has a high carrier mobility dozens of times that of commercial silicon wafers, and is little affected by temperature and doping effects, showing excellent Electron transport properties. Graphene crystals have important application value in ultra-high frequency electronic devices. However, the improvement of the performance of graphene electronic devices is severely restricted by the quality of graphene, and the preparation of high-quality, low-c...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L21/02
CPCH01L21/02378H01L21/02488H01L21/02527H01L21/02658
Inventor 孙丽于法鹏刘振兴李妍璐程秀凤陈秀芳赵显
Owner SHANDONG UNIV
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