Manufacturing method of semiconductor devices by using dry etching technology
First Claim
1. A manufacturing method of semiconductor devices by using dry etching technology comprising the steps of:
- forming an organic silicon film on a semiconductor substrate;
dry-etching the organic silicon film to form a portion which is predetermined to be constituted by the insulating film of the semiconductor device by using the organic silicon film; and
changing the organic silicon film into an insulating film so that the portion of the semiconductor device constituted by the insulating film is formed.
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Abstract
There is provided a method of forming an interlayer insulating film having a dual-damascene structure, a contact hole and a deep trench mask using an organic silicon film. The shape of polysilane or the like is processed so that polysilane is used as an interlayer insulating film having a dual-damascene structure to control the shape and depth and prevent borderless etching which must be solved when a trench is formed. Polysilane and an insulating film are formed into a laminated structure so as to be integrated with each other after a dry etching step has been completed to easily form a contact hole having a high aspect ratio. The surface of polysilane is selectively formed into an insulating film so as to be used as a mask for use in a dry etching step. Polysilane for use as an anti-reflective film or an etching mask is changed to an oxide film or a nitride film so that films are easily removed. Hence it follows that a device region and a device isolation region of a densely integrated circuit can be smoothed, a self-aligned contact hole and metallization trench can be formed with a satisfactory manufacturing yield and the pattern of a gate electrode can be formed.
39 Citations
29 Claims
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1. A manufacturing method of semiconductor devices by using dry etching technology comprising the steps of:
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forming an organic silicon film on a semiconductor substrate;
dry-etching the organic silicon film to form a portion which is predetermined to be constituted by the insulating film of the semiconductor device by using the organic silicon film; and
changing the organic silicon film into an insulating film so that the portion of the semiconductor device constituted by the insulating film is formed. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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18. A manufacturing method of semiconductor devices by using dry etching technology, comprising the steps of:
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forming an organic silicon film having bondings of silicon and silicon as the main chains thereof on a semiconductor substrate and selectively introducing any one of oxygen, nitrogen, hydrogen and carbon elements into at least the surface of the organic silicon film, forming a portion of the semiconductor device constituted by insulating material by performing selective dry etching such that the surface of the organic silicon film is used as a mask; and
introducing at least any one of oxygen, nitrogen, hydrogen and carbon elements into the organic silicon film after the organic silicon film has been dry-etched to integrate both of the surface of the organic silicon film and the inside portion of the organic silicon film as any one of an organic silicon oxide film, an inorganic silicon oxide film, a silicon oxide film, a silicon nitride film and a silicon oxynitride film. - View Dependent Claims (19)
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20. A manufacturing method of semiconductor devices by using dry etching technology comprising the steps of:
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forming an organic silicon film having bondings of silicon and silicon as the main chains thereof on a semiconductor substrate and selectively introducing any one of oxygen, nitrogen, hydrogen and carbon elements into at least the surface of the organic silicon film;
forming a portion of the semiconductor device constituted by insulating material by performing selective dry etching such that the surface of the organic silicon film is used as a mask;
introducing at least any one of oxygen, nitrogen, hydrogen and carbon elements into the organic silicon film after the organic silicon film has been dry-etched to make the surface of the organic silicon film and the inside portion of the organic silicon film to be constituted by different type films which are an organic silicon oxide film, an inorganic silicon oxide film, a silicon oxide film, a silicon nitride film and a silicon oxynitride film; and
removing the mask by performing selective etching of the surface of the organic silicon film and the inside portion of the organic silicon film.
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21. A manufacturing method of semiconductor devices by using dry etching technology, comprising the steps of:
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using an organic silicon film to form an anti-reflective film for use in a photolithography step on the upper surface of the insulating film on a semiconductor substrate;
introducing any one of oxygen, nitrogen, hydrogen and carbon elements into the organic silicon film after the photolithography step has been completed to constitute the anti-reflective film by any one of an organic silicon oxide film, an inorganic silicon oxide film, a silicon oxide film, a silicon nitride film and a silicon oxynitride film; and
integrating the anti-reflective film and the insulating film with each other.
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22. A manufacturing method of semiconductor devices by using dry etching technology, comprising the steps of:
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using an organic silicon film to form an anti-reflective film for use in a photolithography step on the upper surface of the insulating film on a semiconductor substrate;
introducing any one of oxygen, nitrogen, hydrogen and carbon elements into the organic silicon film after the photolithography step has been completed to constitute the anti-reflective film by any one of an organic silicon oxide film, an inorganic silicon oxide film, a silicon oxide film, a silicon nitride film and a silicon oxynitride film; and
removing the anti-reflective film by etching by using selective etching of the anti-reflective film and the insulating film subjected to the process.
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23. A manufacturing method of semiconductor devices by using dry etching technology comprising the steps of:
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forming a thermal oxide film on a semiconductor substrate;
forming a silicon oxide film on the organic silicon film by coating the thermal oxide film with an organic silicon film;
forming an opening portion which reaches the surface of the semiconductor substrate on a multilayered film constituted by the silicon oxide film and the organic silicon film;
changing the organic silicon film to a silicon nitride film by introducing nitrogen into the organic silicon film subjected to the step; and
forming a trench on the semiconductor substrate by using a multilayered film constituted by the silicon oxide film and the silicon nitride film, as a mask.
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24. A manufacturing method of semiconductor devices by using dry etching technology comprising the steps of:
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coating a semiconductor substrate with an organic silicon film and forming the pattern of the organic silicon film by using a resist as a mask such that a device region on the semiconductor substrate is covered; and
forming an isolation trench in the semiconductor substrate by using the organic silicon film, the pattern of which has been formed, and the resist as masks and changing the organic silicon film to a silicon nitride film by introducing nitrogen into the organic silicon film. - View Dependent Claims (25)
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26. A manufacturing method of semiconductor devices by using dry etching technology comprising the steps of:
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forming a gate insulating film on a semiconductor substrate and forming at least one metallic film on the gate insulating film;
forming the pattern of the organic silicon film in a region of the semiconductor substrate which has been covered with the mask and in which the gate electrode has been formed such that a resist is used as a mask;
forming the pattern of a gate electrode constituted by the metallic film in the region in which the gate electrode has been formed such that the organic silicon film, the pattern of which has been formed, and the resist are used as masks; and
changing the organic silicon film, the pattern of which has been formed, into a nitride film by introducing nitrogen into the organic silicon film.
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27. A manufacturing method of semiconductor devices by using dry etching technology comprising the steps of:
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forming a gate insulating film on a semiconductor substrate, forming at least one metallic film on the gate electrode insulating film and forming the pattern of a gate electrode constituted by the metallic film on a region of the semiconductor substrate which is covered with the metallic film and in which a gate electrode will be formed;
covering the gate electrode with a silicon nitride film and depositing a first insulating film on the overall upper surface of the semiconductor substrate such that the gate electrode is buried;
smoothing the surface of the first insulating film and coating the surface of the smoothed first insulating film with an organic silicon film;
forming a contact hole which reaches the first insulating film in the organic silicon film by selectively removing the organic silicon film which covers a region adjacent to the gate electrode in which either of a source or a drain will be formed and a portion of the gate electrode adjacent to the source or the drain by performing dry etching using a resist as a mask;
exposing the silicon nitride film to the bottom portion of the contact hole by dry-etching the first insulating film by using the resist and the organic silicon film as masks;
in a self-aligning manner, exposing the surface of either of region on the surface of the semiconductor substrate in which the source will be formed or a region in which the drain will be formed by removing the silicon nitride film and the gate insulation film by further etching; and
integrating the organic silicon film with the first insulating film and using the contact hole to connect metallizations by changing the organic silicon film into a second insulating film constituted by any one of an organic silicon oxide film, an inorganic silicon oxide film, a silicon oxide film, a silicon nitride film and a silicon oxynitride film.
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28. A manufacturing method of semiconductor devices by using dry etching technology comprising the steps of:
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forming a gate insulating film on a semiconductor substrate, forming at least one metallic film on the gate insulating film and forming the pattern of a gate electrode constituted by the metallic film in a region of the semiconductor substrate which is covered with the metallic film and in which the gate electrode will be formed;
furthermore covering the first silicon oxide film by covering the gate electrode with a silicon nitride film and depositing the gate electrode on the silicon nitride film;
forming a contact hole which reaches the first silicon oxide film in the organic silicon film by coating the overall upper surface of the semiconductor substrate with the organic silicon film and by selectively removing the organic silicon film which covers a region adjacent to the gate electrode in which a source or a drain will be formed and a portion of the gate electrode adjacent to the portion in which the source or the drain will be formed by performing dry etching which uses a resist as a mask;
removing the first silicon oxide film exposed to the bottom surface of the contact hole by introducing oxygen into the organic silicon film to change the organic silicon film into a second silicon oxide film and by performing dry etching such that the second silicon oxide film is used as a mask; and
in a self-alignment manner, exposing the surface of the region which has been formed on the semiconductor substrate and in which the source or the drain will be formed and using the contact hole for connecting metallizations by further removing the silicon nitride film and gate insulating film exposed owing to removal of the first silicon oxide film.
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29. A dry etching method comprising the steps of:
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forming an organic silicon film having main chains thereof constituted by bondings of silicon and silicon on a semiconductor substrate and forming a portion of the semiconductor device constituted by insulating material by dry-etching at least the organic silicon film; and
changing a portion of the organic silicon film into an insulating film constituted by any one of an organic silicon oxide film, an inorganic silicon oxide film, a silicon oxide film, a silicon nitride film and a silicon oxynitride film by processing the processed organic silicon film by executing at least heat treatment which is performed in O2, N2 or H2 gas, heat treatment which is performed in O2, N2 or H2 plasma or implantation of O2, N2 or H2 ions and heat treatment.
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Specification