Semiconductor Structure And Method For Manufacturing The Same
First Claim
1. A method for manufacturing a semiconductor structure, comprising:
- (a) providing a substrate, and forming a dielectric layer and a dummy gate layer on the substrate;
(b) performing doping and annealing to the dummy gate layer;
(c) patterning the dummy gate layer to form a dummy gate, wherein the top cross section of the dummy gate is larger than the bottom cross section of the dummy gate;
(d) forming sidewall spacers and source/drain regions;
(e) depositing an interlayer dielectric layer and planarizing the interlayer dielectric layer;
(f) removing the dummy gate to form an opening within the sidewall spacers; and
(g) forming a gate in the opening.
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Abstract
The present invention provides a method for manufacturing a semiconductor structure, which comprises: providing a substrate, and forming a dielectric layer and a dummy gate layer on the substrate; performing doping and annealing to the dummy gate layer; patterning the dummy gate layer to form a dummy gate, wherein the top cross section of the dummy gate is larger than the bottom cross section of the dummy gate; forming sidewall spacers and source/drain regions; depositing an interlayer dielectric layer and planarizing the same; removing the dummy gate to form an opening within the sidewall spacers; and forming a gate in the opening. Accordingly, the present invention further provides a semiconductor structure. The present invention proposes to form a dummy gate in the shape of a reverse taper, which is capable of alleviating processing difficulty of removing the dummy gate and filling gate material at subsequent steps, and thereby favorably avoiding occurrence of voids or the like and enhancing reliability of devices.
25 Citations
13 Claims
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1. A method for manufacturing a semiconductor structure, comprising:
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(a) providing a substrate, and forming a dielectric layer and a dummy gate layer on the substrate; (b) performing doping and annealing to the dummy gate layer; (c) patterning the dummy gate layer to form a dummy gate, wherein the top cross section of the dummy gate is larger than the bottom cross section of the dummy gate; (d) forming sidewall spacers and source/drain regions; (e) depositing an interlayer dielectric layer and planarizing the interlayer dielectric layer; (f) removing the dummy gate to form an opening within the sidewall spacers; and (g) forming a gate in the opening. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 12, 13)
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10. A semiconductor structure, which comprises a substrate, a gate stack, sidewall spacers, and source/drain regions, wherein
the gate stack is located on the substrate and comprises a gate dielectric layer and a gate, and the top cross section of the gate is larger than the bottom cross section of the gate, the gate dielectric layer being sandwiched between the gate and the substrate, or alternatively, the gate dielectric layer being covering the sidewalls and the bottom of the gate; -
the sidewall spacers are located on both sides of the gate stack; and the source/drain regions are formed within the substrate and located on opposite sides of the gate stack. - View Dependent Claims (11)
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Specification