Metal oxide semiconductor transistor and method of manufacturing the same
First Claim
1. A method for manufacturing a MOS transistor, comprising:
- forming a substrate, the substrate defining a first transistor region and a second transistor region and having a first opening and a second opening formed by removing a dummy gate, the substrate comprising a high-k dielectric layer and a barrier layer on the high-k dielectric layer in each of the first opening and the second opening;
forming a dielectric barrier layer on the substrate to fill into the first opening and the second opening and to cover the barrier layer;
removing a first portion of the dielectric barrier layer in the first transistor region so as to expose the barrier layer in the first opening;
forming a first work function metal layer on the substrate after removing the portion of the dielectric barrier layer in the first transistor region to fill into the first opening and the second opening;
removing the first work function metal layer in the second transistor region;
removing a second portion of the dielectric barrier layer in the second transistor region so as to expose the barrier layer in the second opening; and
forming a second work function metal layer on the substrate after removing the second portion of the dielectric barrier layer in the second transistor region to fill into the first opening and the second opening.
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Accused Products
Abstract
A method for manufacturing a MOS transistor is provided. A substrate has a high-k dielectric layer and a barrier in each of a first opening and a second opening formed by removing a dummy gate and located in a first transistor region and a second transistor region. A dielectric barrier layer is formed on the substrate and filled into the first opening and the second opening to cover the barrier layers. A portion of the dielectric barrier in the first transistor region is removed. A first work function metal layer is formed. The first work function metal layer and a portion of the dielectric barrier layer in the second transistor region are removed. A second work function metal layer is formed. The method can avoid a loss of the high-k dielectric layer to maintain the reliability of a gate structure, thereby improving the performance of the MOS transistor.
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Citations
26 Claims
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1. A method for manufacturing a MOS transistor, comprising:
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forming a substrate, the substrate defining a first transistor region and a second transistor region and having a first opening and a second opening formed by removing a dummy gate, the substrate comprising a high-k dielectric layer and a barrier layer on the high-k dielectric layer in each of the first opening and the second opening; forming a dielectric barrier layer on the substrate to fill into the first opening and the second opening and to cover the barrier layer; removing a first portion of the dielectric barrier layer in the first transistor region so as to expose the barrier layer in the first opening; forming a first work function metal layer on the substrate after removing the portion of the dielectric barrier layer in the first transistor region to fill into the first opening and the second opening; removing the first work function metal layer in the second transistor region; removing a second portion of the dielectric barrier layer in the second transistor region so as to expose the barrier layer in the second opening; and forming a second work function metal layer on the substrate after removing the second portion of the dielectric barrier layer in the second transistor region to fill into the first opening and the second opening. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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17. A method for manufacturing a MOS transistor, comprising:
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forming a substrate having an opening, a high-k dielectric layer being disposed in the opening and is located at the bottom of the opening and a barrier layer being formed on the high-k dielectric layer; forming a dielectric barrier layer on the substrate and filled into the opening to cover a sidewall of the opening and the barrier layer located at the bottom of the opening; removing the dielectric barrier layer on the barrier layer located at the bottom of the opening so as to expose the barrier layer; and forming a work function metal layer on the substrate and filled into the opening, the work function metal layer covering the dielectric barrier layer on the sidewall of the opening and covering the barrier layer located at the bottom of the opening. - View Dependent Claims (18, 19, 20, 21, 22, 23, 24, 25, 26)
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Specification