Semiconductor manufacturing process with oxide film formed on an uneven surface pattern
First Claim
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1. A process for manufacturing a semiconductor device comprising:
- forming a plurality of wires having a prescribed thickness on a first region of a semiconductor substrate; and
forming a silicon oxide film on said first region of said semiconductor substrate, on a second region of said semiconductor substrate surrounding said first region and on a third region of said semiconductor substrate surrounding said second region by chemical vapor deposition employing a gas mixture composed of a silicon atom containing gas and hydrogen peroxide, a thickness of said silicon oxide film becoming smaller in said second region in proportion to a distance from said first region, said silicon oxide film being planarized in said third region and a thickness of said silicon oxide film in said third region being at least 50% of but no more than said thickness of said wires.
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Abstract
A silicon oxide film is formed on a wire array by CVD employing a gas mixture composed of a gas containing silicon atoms and hydrogen peroxide, and the thickness of the silicon oxide film in the region apart from the wire array is formed to be at least 50% of the wire thickness. Planarization of the silicon oxide film over the wire array region is attained.
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Citations
20 Claims
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1. A process for manufacturing a semiconductor device comprising:
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forming a plurality of wires having a prescribed thickness on a first region of a semiconductor substrate; and forming a silicon oxide film on said first region of said semiconductor substrate, on a second region of said semiconductor substrate surrounding said first region and on a third region of said semiconductor substrate surrounding said second region by chemical vapor deposition employing a gas mixture composed of a silicon atom containing gas and hydrogen peroxide, a thickness of said silicon oxide film becoming smaller in said second region in proportion to a distance from said first region, said silicon oxide film being planarized in said third region and a thickness of said silicon oxide film in said third region being at least 50% of but no more than said thickness of said wires. - View Dependent Claims (2, 3, 4, 5)
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6. A process for manufacturing a semiconductor device comprising:
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forming an insulating layer on a semiconductor substrate; forming a plurality of bit lines having a step thickness on a first region of said insulating layer; and forming a first silicon oxide film on said first region of said semiconductor substrate and over said bit lines, on a second region of said semiconductor substrate surrounding said first region and on a third region of said semiconductor substrate surrounding said second region by chemical vapor deposition employing a gas mixture composed of a silicon atom containing gas and hydrogen peroxide; a thickness of said first silicon oxide film becoming smaller in said second region in proportion to a distance from said first region, said first silicon oxide film being planarized in said third region and a thickness of said first silicon oxide film in said third region being at least 50% of but no more than said thickness. - View Dependent Claims (7, 8, 9)
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10. A process for manufacturing a semiconductor memory device on a semiconductor substrate having a memory cell region, a peripheral circuit region and a intermediate region disposed between said memory cell region and peripheral circuit region, comprising:
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forming a plurality of memory cell transistors in said memory cell region and having a first step height; forming a plurality of word lines connected to selected ones of said memory cell transistors and having a second step height; forming a plurality of wires over said transistors having a third step height; and forming a first silicon oxide film in said memory cell region and in said peripheral circuit region and over said plurality of wires, said first silicon oxide film having a first thickness in said memory cell region, a second thickness in said intermediate region and a third thickness in said peripheral circuit region; wherein said first thickness is greater than said at third step height and said third thickness is at least 50% of but no more than said third step height. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
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Specification