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Method for preparing cubic boron nitride thin film

A technology of cubic boron nitride and hexagonal boron nitride, applied in chemical instruments and methods, nitrogen compounds, inorganic chemistry, etc.

Inactive Publication Date: 2009-11-11
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This method has not been reported at home and abroad

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0018] Step 1: Prepare a hexagonal boron nitride thin film in a radio frequency (13.56 Hz) sputtering system. The sputtering system uses high-purity hexagonal boron nitride (99.99%) hot-pressed targets. In this example, the most commonly used single crystal polished silicon wafer in the semiconductor industry is used as the substrate (for example: n-type, resistivity 2-4Ωcm, thickness 0.3-0.5mm). Before deposition, the substrate was ultrasonically cleaned with toluene, acetone, ethanol, 20% hydrofluoric acid solution (the volume ratio of hydrofluoric acid and deionized water was 1:4) and deionized water. The specific growth process parameters of the film in this example are listed in Table 1

[0019] Pre-vacuum

(×10 -3 Pa)

When deposited

Room (mins)

working gas

(Ar / N 2 )

Working gas

Pressure (Pa)

the power

(W)

＜2

240

5∶1

1.5

400

[0020] The thickness of the prepared hexagonal ...

example 2

[0024] Step 1: Prepare a hexagonal boron nitride thin film in a radio frequency (13.56 Hz) sputtering system. Equipment and substrate pretreatment are the same as above. The specific growth process parameters of this example film are listed in Table 2

[0025] Pre-vacuum

(×10 -3 Pa)

deposition

time (mins)

working gas

(Ar / N 2 )

Working gas

Pressure (Pa)

the power

(W)

＜2

60

3∶1

1

300

[0026] The thickness of the prepared hexagonal boron nitride film is about 300nm.

[0027] Step 2: The obtained hexagonal boron nitride film is subjected to high-purity nitrogen protective annealing at 900° C. for 40 minutes.

[0028] The cubic phase content in the obtained cubic boron nitride film is about 92%.

example 3

[0030] Step 1: Prepare a hexagonal boron nitride thin film in a radio frequency (13.56 Hz) sputtering system. Equipment and substrate pretreatment are the same as above. The specific growth process parameters of this example film are listed in Table 3

[0031] Pre-vacuum

(×10 -3 Pa)

When deposited

Room (mins)

working gas

(Ar / N 2 )

Working gas

Pressure (Pa)

the power

(W)

＜2

120

4∶1

1.3

300

[0032] The thickness of the prepared hexagonal boron nitride film is about 700nm.

[0033] Step 2: The obtained hexagonal boron nitride film is subjected to high-purity nitrogen protective annealing at 950° C. for 20 minutes.

[0034] The cubic phase content in the obtained cubic boron nitride film is about 87%.

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Abstract

A method for preparing a cubic boron nitride thin film belongs to the field of wide band gap semiconductor or superhard material thin film. The direct preparation of boron nitride films with high cubic phase content is difficult to control and has poor repeatability; during the nucleation and growth of cubic boron nitride films, energetic particles must bombard the surface of the film, which will cause structural defects in the film and residual stress in the film. If it is too large, it is easy to crack and fall off. Steps of the present invention: after the substrate is cleaned, a hexagonal boron nitride film is deposited on the substrate material using vapor phase film growth equipment; the vacuum degree is pumped below 5 Pa, and the hexagonal boron nitride film is annealed with nitrogen protection: the annealing temperature is 850- 950°C, constant temperature for 20-60 minutes; the nitrogen gas is above 99.999% pure. The present invention has loose conditions and good repeatability: no need to install a substrate heating device and a substrate negative bias device to generate energy particles to bombard the film; no need to select the best working gas pressure and composition; and the hexagonal boron nitride film The deposition rate is faster, and it is not easy to crack and fall off.

Description

technical field [0001] The invention relates to a method for preparing a cubic boron nitride thin film by combining vapor deposition and annealing technology. The invention belongs to the field of wide bandgap semiconductor or superhard material film preparation. Background technique [0002] Boron nitride (BN) is a new wide bandgap semiconductor material. In the boron nitride system, hexagonal boron nitride (h-BN) and cubic boron nitride (c-BN) are the two stable main phases. Among them, cubic boron nitride has outstanding physical, chemical and mechanical properties. Therefore, the research on its material preparation and characteristics, as well as the exploration of industrialization and deviceization have been the research topics of scientific researchers in various countries and well-known semiconductor companies such as US G.E., IBM, and British DeBeers in recent years. [0003] The hardness and thermal conductivity of cubic boron nitride are second only to diamond...

Claims

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Application Information

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IPC IPC(8): C23C16/34C23C16/56C01B21/064
Inventor 邓金祥张晓康陈光华
Owner BEIJING UNIV OF TECH
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