Method of fabricating semiconductor device
First Claim
1. A method of fabricating a semiconductor device by employing ion implantation to provide a semiconductor substrate at a surface thereof with a region having dopant introduced therein, comprising the steps of:
- providing said semiconductor substrate at a surface thereof with a mask layer including a first SiO2 film, a second SiO2 film and a thin metal film disposed between said first and second SiO2 films; and
implanting dopant ions.
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Accused Products
Abstract
There is provided a method of fabricating semiconductor devices that allows ion implantation to be performed at high temperature with ions accelerated with high energy to help to introduce dopant in a semiconductor substrate, in particular a SiC semiconductor substrate, at a selected region to sufficient depth. To achieve this the method includes the steps of: providing the semiconductor substrate at a surface thereof with a mask layer including a polyimide resin film, or a SiO2 film and a thin metal film; and introducing dopant ions.
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Citations
25 Claims
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1. A method of fabricating a semiconductor device by employing ion implantation to provide a semiconductor substrate at a surface thereof with a region having dopant introduced therein, comprising the steps of:
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providing said semiconductor substrate at a surface thereof with a mask layer including a first SiO2 film, a second SiO2 film and a thin metal film disposed between said first and second SiO2 films; and implanting dopant ions. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11)
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12. A method of preparing a doped semiconductor substrate, comprising the steps:
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a) providing a semiconductor substrate; b) providing a mask layer to include a first SiO2 film, a second SiO2 film, and a first thin metal film disposed between said first and second SiO2 films on a first region of a surface of said substrate; c) heating said substrate to at least 300°
C.; andd) while said substrate is at a temperature of at least 300°
C., implanting, by ion implantation, dopant ions into said substrate through a second region of said surface to form in said substrate a doped region that is doped with said dopant ions. - View Dependent Claims (13, 14, 15, 16)
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17. A method of preparing a doped semiconductor substrate, comprising the steps:
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a) providing a semiconductor substrate; b) providing a mask layer on a first region of a surface of said substrate, wherein said mask layer is formed to include a SiO2 film, a thin metal film and a polyimide resin film arranged with at least one of said thin metal film or said SiO2 film between said polyimide resin film and said semiconductor substrate; c) heating said substrate to at least 300°
C.; andd) while said substrate is at a temperature of at least 300°
C., implanting, by ion implantation, dopant ions into said substrate through a second region of said surface to form in said substrate a doped region that is doped with said dopant ions. - View Dependent Claims (18, 19, 20)
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21. A method of fabricating a semiconductor device by employing ion implantation to provide a semiconductor substrate at a surface thereof with a region having dopant introduced therein, comprising the steps of:
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providing said semiconductor substrate at a surface thereof with a mask layer including a SiO2 film and a thin metal film; further providing a polyimide resin film on said thin metal film or on said SiO2 film such that said thin metal film or said SiO2 film is between said polyimide resin film and said semiconductor substrate; and implanting dopant ions. - View Dependent Claims (22, 23, 24, 25)
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Specification