Method for preparing nanocrystalline diamond film by using helicon wave plasma technology

Abstract

The invention relates to a method for preparing a nanocrystalline diamond film by adopting a helicon wave plasma technology. The method comprises the following steps: (1) introducing Ar gas and H2 gas into a discharge chamber, realizing Ar and H2 mixed gas discharge through radio frequency modulated helicon wave plasma in an axial magnetic field environment, and cleaning a substrate holder and a Si substrate; (2) closing H2 gas, introducing Ar gas and CH4 gas, and forming a nanocrystalline diamond film on the Si substrate through the radio frequency modulated helicon wave plasma in the axial magnetic field environment; and (3) cleaning the CH4 gas adsorbed to the surface of the nanocrystalline diamond film. According to the invention, the nanocrystalline diamond film is successfully prepared by the helicon wave plasma technology, the used equipment is simple, the industrial production is easy to realize, the deposition speed is high, and the problem that the filament performance is degraded is solved; moreover, the process steps are simple, and the process parameters are easy to control.

Description

technical field [0001] The invention relates to a method for preparing a nanocrystalline diamond film, in particular to a method for preparing a nanocrystalline diamond film by adopting a helicon wave plasma technology. Background technique [0002] Diamond is the substance with the most compact arrangement of atoms. Its crystal structure determines that it has many excellent physical and chemical properties, such as: extremely high hardness and elastic modulus, very low thermal expansion coefficient, high fracture strength, large Bandgap width, extremely low dielectric constant, etc. Nanocrystalline diamond (NCD) film generally refers to a diamond film with an average grain size below 100 nm. Due to the size effect, nanocrystalline diamond also exhibits many unique physical and chemical properties. For example: In addition to having many of the excellent physical and chemical properties of diamond mentioned above, nanocrystalline diamond also has higher optical transmitta...

AI Technical Summary

Problems solved by technology

However, they all have some disadvantages, including: microwave plasma CVD equipment is expensive, and the deposition chamber design needs to be simulated; the deposition rate of hot wire CVD is low, and the performance of the filament decays during the deposition process; the process parameters of DC arc plasma jet CVD Difficult to control, easy to pollute electrodes

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