METHOD FOR MANUFACTURING SEMICONDUCTOR DEVICE HAVING DUAL GATE DIELECTRIC LAYER
First Claim
1. A method of manufacturing a semiconductor device, comprising:
- providing a substrate including a first region and a second region;
forming a first gate dielectric layer having a first thickness on the substrate;
forming an interlayer insulating layer on the substrate, the interlayer insulating layer including a first trench exposing the first gate dielectric layer of the first region and a second trench exposing the first gate dielectric layer of the second region;
forming a sacrificial layer on the interlayer insulating layer and bottoms of the first and second trenches;
forming a mask pattern covering the second trench of the second region on the sacrificial layer;
removing the sacrificial layer in the first region using the mask pattern as an etch mask to form a sacrificial pattern exposing the first gate dielectric layer of the bottom of the first trench;
removing the first gate dielectric layer of the bottom of the first trench to expose the substrate;
removing the mask pattern;
removing the sacrificial pattern;
forming a second gate dielectric layer having a second thickness on the bottom of the first trench; and
forming a gate electrode on each of the first gate dielectric layer and the second gate dielectric layer.
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Abstract
Methods for manufacturing a semiconductor device having a dual gate dielectric layer may include providing a substrate including first and second regions, forming a first gate dielectric layer having a first thickness on the substrate, forming an interlayer insulating layer including first and second trenches exposing the first gate dielectric layer in the first and second regions, forming a sacrificial layer on the interlayer insulating layer and bottoms of the first and second trenches, forming a sacrificial pattern exposing the first gate dielectric layer of the bottom of the first trench, removing the first gate dielectric layer of the bottom of the first trench, forming a second gate dielectric layer having a second thickness on the bottom of the first trench, removing the sacrificial pattern, and forming a gate electrode on each of the first and second gate dielectric layers.
16 Citations
23 Claims
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1. A method of manufacturing a semiconductor device, comprising:
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providing a substrate including a first region and a second region; forming a first gate dielectric layer having a first thickness on the substrate; forming an interlayer insulating layer on the substrate, the interlayer insulating layer including a first trench exposing the first gate dielectric layer of the first region and a second trench exposing the first gate dielectric layer of the second region; forming a sacrificial layer on the interlayer insulating layer and bottoms of the first and second trenches; forming a mask pattern covering the second trench of the second region on the sacrificial layer; removing the sacrificial layer in the first region using the mask pattern as an etch mask to form a sacrificial pattern exposing the first gate dielectric layer of the bottom of the first trench; removing the first gate dielectric layer of the bottom of the first trench to expose the substrate; removing the mask pattern; removing the sacrificial pattern; forming a second gate dielectric layer having a second thickness on the bottom of the first trench; and forming a gate electrode on each of the first gate dielectric layer and the second gate dielectric layer. - 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 method for manufacturing a semiconductor device, comprising:
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providing a substrate including a first region and a second region; forming a first gate dielectric layer having a first thickness on the substrate; forming an interlayer insulating layer on the substrate, the interlayer insulating layer including a first trench exposing the first gate dielectric layer of the first region and a second trench exposing the first gate dielectric layer of the second region; forming a sacrificial layer on the interlayer insulating layer and bottoms of the first and second trenches; forming a mask pattern covering the second trench of the second region on the sacrificial layer; removing the sacrificial layer in the first region using the mask pattern as an etch mask to form a sacrificial pattern covering the second trench; removing the mask pattern; removing the first gate dielectric layer of the bottom of the first trench using the sacrificial pattern as an etch mask to expose the substrate; forming a second gate dielectric layer having a second thickness on the bottom of the first trench; and forming a gate electrode on each of the first gate dielectric layer and the second gate dielectric layer. - View Dependent Claims (19)
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20. A method for manufacturing a semiconductor device, comprising:
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providing a substrate including a first region and a second region; forming a first gate dielectric layer having a first thickness on the substrate; forming an interlayer insulating layer on the substrate, the interlayer insulating layer including a first trench exposing the first gate dielectric layer of the first region and a second trench exposing the first gate dielectric layer of the second region; forming a sacrificial layer on the interlayer insulating layer and bottoms of the first and second trenches; forming a mask pattern covering the second trench of the second region on the sacrificial layer; removing the sacrificial layer in the first region using the mask pattern as an etch mask to form a sacrificial pattern; removing an upper portion of the first gate dielectric layer of the bottom of the first trench to form a second gate dielectric layer having a second thickness smaller than the first thickness; and forming a gate electrode on each of the first gate dielectric layer and the second gate dielectric layer.
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21. A method for manufacturing a semiconductor device having a dual gate dielectric layer, comprising:
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providing a substrate including first and second regions; forming a first gate dielectric layer having a first thickness on the substrate; forming an interlayer insulating layer including first and second trenches exposing the first gate dielectric layer in the first and second regions; forming a sacrificial layer on the interlayer insulating layer and bottoms of the first and second trenches; forming a sacrificial pattern exposing the first gate dielectric layer of the bottom of the first trench; forming a second gate dielectric layer having a second thickness on the bottom of the first trench;
removing the sacrificial pattern; andforming a gate electrode on each of the first and second gate dielectric layers. - View Dependent Claims (22, 23)
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Specification