阅读说明：本技术 用于单晶金刚石生长的晶种托 (Seed crystal support for growth of single crystal diamond ) 是由 闫石 李俊杰 顾长志 于 2019-03-05 设计创作，主要内容包括：本发明提供一种用于单晶金刚石生长的晶种托,其中,所述晶种托上表面(7)为凹球面,所述凹球面中心具有贯穿孔(5),所述贯穿孔底部放置晶种垫(6)。本发明提供的晶种托可控制等离子体范围以获得更均匀的能量密度,从而使得单晶金刚石晶种具有更好的生长效果,生长速率达到20μm/h～30μm/h,并能够保证生长模式为层状模式。本发明提供的晶种托适用于不同厚度的单晶金刚石晶种,且方便拆卸清洗和重复利用。(The invention provides a seed crystal support for growing single crystal diamond, wherein the upper surface (7) of the seed crystal support is a concave spherical surface, the center of the concave spherical surface is provided with a through hole (5), and a seed crystal pad (6) is placed at the bottom of the through hole. The seed crystal support provided by the invention can control the plasma range to obtain more uniform energy density, so that the single crystal diamond seed crystal has better growth effect, the growth rate reaches 20-30 mu m/h, and the growth mode can be ensured to be a layered mode. The seed crystal support provided by the invention is suitable for monocrystalline diamond seed crystals with different thicknesses, and is convenient to disassemble, clean and recycle.)

1. The seed crystal support for growing the single crystal diamond is characterized in that the upper surface (7) of the seed crystal support is a concave spherical surface, a through hole (5) is formed in the center of the concave spherical surface, and a seed crystal pad (6) is arranged at the bottom of the through hole.

2. A seed tray for the growth of single crystal diamond according to claim 1, wherein the height of the seed tray is 4mm to 10 mm.

3. A seed holder for growth of single crystal diamond as recited in claim 1 wherein the seed holder is cylindrical in the lower portion and frustoconical in the upper portion.

4. A seed holder for growth of single crystal diamond according to claim 3, characterized in that the diameter of the cylinder is 30mm to 45mm and the height of the cylinder is 3mm to 9 mm.

5. A seed holder for growth of a mono-crystalline diamond as in claim 3, wherein the height of the circular truncated cone is 1mm to 2mm and the diameter of the upper surface of the circular truncated cone is 20mm to 35 mm.

6. A seed holder for growth of single crystal diamond according to claim 1, wherein the concave spherical curvature radius is not less than 113 mm.

7. A seed holder for growth of single crystal diamond according to claim 1, characterized in that the through-going hole (5) is a square hole and the seed pad (6) is a square pad.

8. A seed holder for growth of single crystal diamond according to claim 7, characterized in that the square holes are 5mm to 10mm on a side.

9. A seed holder for growth of single crystal diamond according to claim 1, characterized in that the seed pad (6) is placed in a snug fit within the through-going hole (5).

10. A seed holder for growth of single crystal diamond according to claim 7, characterized in that the square pad has a side length of 4.9mm to 9.9mm and a thickness of 2mm to 9 mm.

Technical Field

The invention relates to a seed crystal holder for growing single crystal diamond. In particular, the invention relates to a seed crystal support for growing single crystal diamond by microwave plasma chemical vapor deposition.

Background

The growth conditions are harsh when microwave plasma chemical vapor deposition is adopted to grow the single crystal diamond, and particularly the influence of the plasma on the growth effect is obvious. The upper surface of the seed crystal support used at present is a plane, which causes uneven plasma above the seed crystal and poorer growth quality. The seed crystal placement position is a pit. The polycrystal in the pit can not be removed after growth, amorphous carbon at the bottom of the seed crystal is difficult to clean, and the reutilization is poor. The depth of the pit is not adjustable, the requirement on the thickness of the seed crystal is high, and the use range is severely limited.

Disclosure of Invention

The invention aims to solve the problems, make the plasma density above the seed crystal uniform in the growth process of the single crystal diamond and improve the growth rate and the growth quality of the single crystal diamond.

The purpose of the invention is realized by the following technical scheme.

The invention provides a seed crystal support for growth of single crystal diamond, wherein the upper surface of the seed crystal support is a concave spherical surface, a through hole is formed in the center of the concave spherical surface, and a seed crystal pad is arranged at the bottom of the through hole.

Preferably, in the seed holder for growing single crystal diamond according to the present invention, the lower portion of the seed holder is a cylinder, and the upper portion of the seed holder is a circular truncated cone.

The inventor unexpectedly finds that the upper part of the seed crystal support for growing the single crystal diamond is designed into the circular truncated cone, and the upper surface of the circular truncated cone is designed into the concave spherical surface, so that plasma can be concentrated in the growth process of the single crystal diamond, and the technical problems of low growth rate and poor growth quality in the growth process of the single crystal diamond are solved.

In the seed crystal support for the growth of the single crystal diamond, the through hole is used as a seed crystal groove, and the seed crystal pad is arranged in a sliding manner, so that the cleaning of the seed crystal support after growth is convenient, and the problem that the seed crystal support is not easy to recycle is solved. In addition, the present invention is applicable to more seed thicknesses.

Preferably, in the seed holder for growth of single crystal diamond according to the present invention, the height of the seed holder is 4mm to 10 mm.

Preferably, in the seed holder for growth of single crystal diamond according to the present invention, the diameter of the cylinder is 30mm to 45mm, and the height of the cylinder is 3mm to 9 mm.

Preferably, in the seed crystal holder for growing the monocrystalline diamond, the height of the circular truncated cone is 1 mm-2 mm, and the diameter of the upper surface of the circular truncated cone is 20 mm-35 mm.

Preferably, in the seed holder for growth of single crystal diamond according to the present invention, the radius of curvature of the concave spherical surface is not less than 113 mm.

Preferably, in the seed holder for growing single crystal diamond according to the present invention, the through hole is a square hole, and the seed pad is a square pad for controlling a distance from a surface of the single crystal diamond seed to an upper edge of the through hole.

Preferably, in the seed holder for growth of single crystal diamond according to the present invention, the seed pad (6) is placed in the through-hole (5) in a slip fit manner.

Preferably, in the seed holder for growing single crystal diamond according to the present invention, the side of the square hole is 5mm to 10 mm.

Preferably, in the seed crystal holder for growing the single crystal diamond, the side length of the square pad is 4.9-9.9 mm, and the thickness of the square pad is 2-9 mm.

The invention has the following advantages:

the seed crystal support provided by the invention can control the range of plasma so as to obtain more uniform energy density, so that the single crystal diamond seed crystal has better growth effect, the growth rate can reach 20-30 mu m/h, and the growth mode can be ensured to be a layered mode. The seed crystal support provided by the invention is suitable for monocrystalline diamond seed crystals with different thicknesses, and is convenient to disassemble, clean and recycle.

Drawings

Embodiments of the invention are described in detail below with reference to the attached drawing figures, wherein:

FIG. 1 is a cross-sectional view of a prior art seed tray;

FIG. 2 is a cross-sectional view of a seed holder of the present invention;

FIG. 3 is a top view of a seed holder of the present invention;

fig. 4 is a view showing the operation of the seed holder according to the present invention.

Description of reference numerals:

1 equipment base station

2 sample growth Chamber

3 plasma ball

4 single crystal diamond seed crystal

5 through hole

6 seed crystal pad

7 seed crystal support upper surface

8 seed crystal holder

Detailed Description

Referring now to the drawings, an illustrative scheme of the disclosed seed tray for single crystal diamond growth will be described in detail. Although the drawings are provided to present some embodiments of the invention, the drawings are not necessarily drawn to scale with respect to the specific embodiments. The position of some components in the drawings can be adjusted according to actual requirements on the premise of not influencing the technical effect. The appearances of the phrase "in the drawings" or similar language in the specification are not necessarily referring to all drawings or examples.

Certain directional terms used hereinafter to describe the drawings, such as "upper", "upper" and other directional terms, will be understood to have their normal meaning and refer to those directions as normally contemplated by the drawings. Unless otherwise indicated, the directional terms described herein are generally in accordance with conventional directions as understood by those skilled in the art.

FIG. 2 shows a cross-sectional view of a seed tray provided by the present invention. FIG. 3 shows a top view of a seed tray provided by the present invention. FIG. 4 shows a working diagram of a seed tray provided by the present invention. Referring to fig. 4, in the illustrated embodiment, a seed for single crystal diamond growth is held on an apparatus base 1 within a sample growth chamber 2 of a microwave plasma chemical vapor deposition apparatus. The seed crystal support is formed by processing metal molybdenum. The plasma ball 3 is positioned right above the seed crystal support, and the lower part of the plasma ball 3 is consistent with the curvature of the upper surface 7 of the seed crystal support. The plasma density is uniform, the edge effect is reduced during the growth of the seed crystal, and the growth quality is improved.

In one embodiment provided by the present invention, the lower portion of the seed holder shown in FIG. 4 is a cylinder having a diameter of 30mm and a height of 3 mm. Of course, in other embodiments, the lower portion of the seed tray may be a cylinder having any number of diameters ranging from 30mm to 45mm and any number of heights ranging from 3mm to 9 mm. The upper part of the seed tray is a circular table with the height of 1mm, and the diameter of the upper surface of the circular table is 20 mm. Of course, in other embodiments, the upper part of the seed tray can be a circular truncated cone with a height of 1mm to 2mm, and the diameter of the upper surface of the circular truncated cone can be any number of 20mm to 35 mm. The upper surface 7 of the seed crystal support is a concave spherical surface with the curvature radius of 113 mm. Of course, in other embodiments, the radius of curvature may be greater than 113 mm. The center of the concave spherical surface is provided with a square through hole 5. The side length of the through hole 5 is 5mm, and the depth is 3 mm. A square seed crystal pad 6 is placed at the bottom of the through hole, the side length of the seed crystal pad 6 is 4.9mm, and the thickness of the seed crystal pad is 2.5 mm. The single crystal diamond seed crystal 4 is placed on the seed crystal pad 6, and the side length of the single crystal diamond seed crystal 4 is 3mm, and the height of the single crystal diamond seed crystal 4 is 1 mm. Of course, in other embodiments, the parameters of the square through hole 5 and the seed pad 6, such as the side length and the thickness, can be selected to be reasonable values within other claimed ranges.

The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent alterations, modifications and combinations can be made by those skilled in the art without departing from the spirit and principles of the invention.