Method for preparing poly crystal germanium silicon film

A technology of silicon thin film and polycrystalline germanium is applied in the field of preparation of polycrystalline germanium silicon thin film, which can solve the problems of poor crystal quality, low carrier mobility, and many defects.

Inactive Publication Date: 2007-12-26
ZHEJIANG UNIV
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Problems solved by technology

[0002] The growth of polycrystalline silicon germanium thin films by chemical vapor deposition has the characteristics of uniform deposition of silicon germanium thin films and high growth efficiency. However, at present, chemical vapor deposition methods are used to grow polycrystalline silicon germanium thin films, and most of them are grown by constant pressure methods. Due to the high growth pressure, As a result, nucleation and growth are alternately carried out during the preparation of thin films, the crystallization is not uniform enough, the crystal quality is poor, there are many defects, and the carrier mobility is not high

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  • Method for preparing poly crystal germanium silicon film

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Embodiment 1

[0014] 1) Clean the silicon substrate and put it into a thermal oxidation furnace, feed oxygen with a purity of 99.99%, and thermally oxidize a layer of 0.2 μm silicon dioxide at 1000°C;

[0015] 2) Put the silicon substrate treated in step 1) into an ultra-high vacuum chemical vapor deposition system, and feed a mixed gas of silane with a purity of 99.999% and germane with a germane content of 10% and hydrogen at 550°C , control the flow ratio of silane and mixed gas to 5:5, the pressure in the growth chamber is 10Pa, grow for 15 minutes, and form silicon germanium crystal nuclei on the surface of silicon dioxide, as shown in Figure 1a;

[0016] 3) Reduce the growth pressure in the growth chamber to 0.01Pa, keep the temperature at 550°C and the flow ratio of silane and mixed gas at 5:5, and selectively grow at the SiGe crystal nucleus (see Figure 1b) for 20 minutes Finally, a polycrystalline silicon germanium thin film with uniform crystal quality in the growth direction is o...

Embodiment 2

[0018] 1) Clean the silicon substrate and put it into a thermal oxidation furnace, feed oxygen with a purity of 99.99%, and thermally oxidize a layer of 0.3 μm silicon dioxide at 1000°C;

[0019] 2) Put the silicon substrate treated in step 1) into an ultra-high vacuum chemical vapor deposition system, and at 600°C, pass through a mixture of disilane with a purity of 99.999% and germane with a germane content of 10% and hydrogen Gas, control the flow ratio of disilane and mixed gas to 5:5, the pressure in the growth chamber is 20Pa, grow for 10 minutes, and form silicon germanium crystal nuclei on the surface of silicon dioxide;

[0020] 3) Reduce the growth pressure in the growth chamber to 0.1Pa, keep the temperature at 600°C and the flow ratio of disilane and mixed gas at 5:5, and selectively grow at the silicon germanium nucleus. After 30 minutes of growth, the obtained Polycrystalline silicon germanium film with uniform crystal quality in the growth direction.

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Abstract

Present invention discloses polycrystalline germanium silicon thin-film preparation method. It contains washing up silicon substrate then putting in thermal oxidizer, thermooxidizing single-layer silicon dioxide on silicon substrate, then putting sample in ultrahigh vacuum chemical vapour plating device, at 500-600 degree centigrade filling in pure silicon source and germane using hydrogen as carrier gas, controlling growth room pressure at 10-20 Pa to form germanium silicon crystal nucleus on silicon dioxide surface, reducing grown pressure to 0.01-0.1 Pa and keeping growth parameter unchanged, selective growth on germanium silicon crystal nucleus to form continuous film. Said invention can obtain crystal mass homogeneous polycrystalline germanium silicon film in film growth direction.

Description

technical field [0001] The invention relates to the preparation of semiconductor materials, in particular to the preparation method of polycrystalline germanium silicon thin film. Background technique [0002] The growth of polycrystalline silicon germanium thin films by chemical vapor deposition has the characteristics of uniform deposition of silicon germanium thin films and high growth efficiency. However, at present, chemical vapor deposition methods are used to grow polycrystalline silicon germanium thin films, and most of them are grown by constant pressure methods. Due to the high growth pressure, As a result, nucleation and growth are alternately carried out during the preparation of thin films, the crystallization is not uniform enough, the crystal quality is poor, there are many defects, and the carrier mobility is not high. Contents of the invention [0003] The object of the present invention is to provide a method for preparing a polycrystalline silicon german...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01L21/205C23C16/52
Inventor 叶志镇吴贵斌赵星刘国军赵炳辉
Owner ZHEJIANG UNIV
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