Method of manufacturing semiconductor devices

A method of manufacturing a semiconductor device furnished on a silicon substrate, said device having component elements formed on the silicon substrate, said component elements including a bipolar element part having a base region and a collector region and a resistance element part formed of an impurity diffusion layer, comprising the steps of:

• (a) forming a first oxide film on the entire surface of said silicon substrate and on on the entire surface of said component elements,
• (b) ion implanting into said collector region of said bipolar element part through said first oxide film,
• (c) wholly removing said first oxide film,
• (d) forming a second oxide film on the entire surface of said silicon substrate and on the entire surface of said component elements,
• (e) selectively removing part of said second oxide film corresponding to said base region of said bipolar element and a surface of said silicon substrate directly underlying said second oxide film to form an exposed surface,
• (f) forming a third oxide layer on said silicon substrate, said remaining second oxide film and said component elements thereby differentiating thickness of the oxide film formed on said base region and thickness of the oxide film formed on said resistance element part, and
• (g) selectively and simultaneously implanting ions into said bipolar element part and said resistance element part.

A method of manufacturing a semiconductor device furnished on a silicon substrate, said device having component elements formed on the silicon substrate, said component elements including a bipolar element part having a base region and a collector region and a resistance element part formed on an impurity diffusion layer, comprising the steps of;

• (a) forming a first oxide film on the entire surface of said silicon substrate and on the entire surface of said component elements,
• (b) implanting ions into said collector region of said bipolar element part through said first oxide film,
• (c) selectively removing part of said first oxide film corresponding to said base region of said bipolar element part and a surface of said silicon substrate directly underlying said first oxide film to form an exposed surface,
• (d) forming a second oxide film on said silicon substrate, said remaining first oxide film, and said component elements throughout the entire surface thereof thereby differentiating thickness of the oxide film formed on said base region and thickness of the oxide film formed on said resistance element part, and
• (e) implanting ions simultaneously into said bipolar element part and said resistance element part.

A method of manufacturing a semiconductor device furnished on a silicon substrate having component elements formed on the silicon substrate, said component elements including a bipolar element part having a collector region and a base region, a resistance element part formed on an impurity diffusion layer, and a MOS element part, comprising the steps of:

• (a) forming a first oxide film on the entire surface of said silicon substrate and on the entire surface of said component elements,
• (b) implanting ions into said collector region of said bipolar element part through said first oxide film,
• (c) wholly removing said first oxide film,
• (d) sequentially forming a gate oxide film and a gate electrode on said MOS element part,
• (e) forming a second oxide film on the entire surface of said silicon substrate and on the entire surface of the component elements,
• (f) selectively removing part of said second oxide film corresponding to said base region of said bipolar element part and a surface of said silicon substrate directly underlying said second oxide film to form an exposed surface,
• (g) forming a third oxide film on said silicon substrate, said remaining second oxide film and said component elements throughout the entire surface thereof thereby differentiating thickness of the oxide film formed on said base region and thickness of the oxide film formed on said resistance element part, and
• (h) implanting ions selectively and simultaneously into said bipolar element part and said resistance element part.