Method for manufacturing semiconductor device
First Claim
1. A method for manufacturing a semiconductor device comprising:
- simultaneously forming first and second well regions on a semiconductor substrate, wherein the second well region becomes a fixed electrode;
simultaneously forming a first gate insulating film on the first well region and a fixed electrode protective film on the second well region;
simultaneously forming a floating gate electrode on the first gate insulating film and a sacrificial film on the fixed electrode protective film;
simultaneously forming a second gate insulating film on the floating gate electrode and a movable electrode protective film on the sacrificial film;
simultaneously forming a gate electrode on the second gate insulating film and a movable electrode on the movable electrode protective film;
removing the sacrificial film to form a void by;
vacuum-sealing the void to form a vacuum chamber;
forming an inter-layer insulating film covering the gate electrode and the movable electrode; and
removing the sacrificial film with the gate electrode and the movable electrode covered with the inter-layer insulating film.
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Abstract
A method for manufacturing a semiconductor device includes: simultaneously forming first and second well regions on a semiconductor substrate, wherein the second well region becomes a fixed electrode; simultaneously forming a first gate insulating film on the first well region and a fixed electrode protective film on the second well region; simultaneously forming a floating gate electrode on the first gate insulating film and a sacrificial film on the fixed electrode protective film; simultaneously forming a second gate insulating film on the floating gate electrode and a movable electrode protective film on the sacrificial film; simultaneously forming a gate electrode on the second gate insulating film and a movable electrode on the movable electrode protective film; removing the sacrificial film to form a void by; and vacuum-sealing the void to form a vacuum chamber.
11 Citations
17 Claims
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1. A method for manufacturing a semiconductor device comprising:
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simultaneously forming first and second well regions on a semiconductor substrate, wherein the second well region becomes a fixed electrode; simultaneously forming a first gate insulating film on the first well region and a fixed electrode protective film on the second well region; simultaneously forming a floating gate electrode on the first gate insulating film and a sacrificial film on the fixed electrode protective film; simultaneously forming a second gate insulating film on the floating gate electrode and a movable electrode protective film on the sacrificial film; simultaneously forming a gate electrode on the second gate insulating film and a movable electrode on the movable electrode protective film; removing the sacrificial film to form a void by; vacuum-sealing the void to form a vacuum chamber; forming an inter-layer insulating film covering the gate electrode and the movable electrode; and removing the sacrificial film with the gate electrode and the movable electrode covered with the inter-layer insulating film. - View Dependent Claims (2, 3, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17)
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4. A method for manufacturing a semiconductor device comprising:
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simultaneously forming first and second well regions on a semiconductor substrate, wherein the second well region becomes a fixed electrode; simultaneously forming a first gate insulating film on the first well region and a fixed electrode protective film on the second well region; simultaneously forming a floating gate on the first gate insulating film and a sacrificial film on the fixed electrode protective film; simultaneously forming a second gate insulating film on the floating gate electrode and a movable electrode protective film on the sacrificial film; simultaneously forming a gate electrode on the second gate insulating film and a movable electrode on the movable electrode protective film; removing the sacrificial film to form a void by; and vacuum-sealing the void to form a vacuum chamber, wherein the movable electrode is supported by a plurality of movable electrode anchors, the movable electrode includes a movable electrode detection region and a movable electrode compensation region located on a perimeter of the movable electrode detection region, and an interval between the movable electrode anchors in the movable electrode compensation region is smaller than an interval between the movable electrode anchors in the movable electrode detection region. - View Dependent Claims (5, 6)
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Specification