Semiconductor device and method for manufacturing the same
A semiconductor device includes a p-channel MIS transistor. A p-channel MIS transistor includes; an n-type semiconductor layer formed on the substrate; first source/drain regions being formed in the n-type semiconductor layer and being separated from each other; a first gate insulating film being formed on the n-type semiconductor layer between the first source/drain regions, and containing silicon, oxygen, and nitrogen, or containing silicon and nitrogen; a first gate electrode formed above the first gate insulating film; and a first interfacial layer being formed at an interface between the first gate insulating film and the first gate electrode, and containing a 13-group element. The total number of metallic bonds in the 13-group element in the interfacial layer being larger than the total number of each of oxidized, nitrided, or oxynitrided bonds in the 13-group element in the interfacial layer.
1. A semiconductor device comprising:
a substrate;
a p-channel MIS transistor that includes; an n-type semiconductor layer formed on the substrate; first source/drain regions being formed in the n-type semiconductor layer and being separated from each other; a first gate insulating film being formed on the n-type semiconductor layer between the first source/drain regions, and containing silicon, oxygen, and nitrogen, or containing silicon and nitrogen; a first gate electrode formed above the first gate insulating film; and a first interfacial layer being formed at an interface between the first gate insulating film and the first gate electrode, and having a first sub-layer provided in the first gate insulating film and a second sub-layer provided in the first gate electrode, each of the first and second sub-layers containing a 13-group element, the total number of metallic bonds in the 13-group element in the interfacial layer being larger than the total number of each of oxidized, nitrided, or oxynitrided bonds in the 13-group element in the interfacial layer; and
an n-channel MIS transistor that includes: a p-type semiconductor layer formed on the substrate; second source/drain regions being formed in the p-type semiconductor layer and being separated from each other; a second gate insulating film being formed on the p-type semiconductor layer between the second source/drain regions, and containing silicon, oxygen, and nitrogen, or containing silicon and nitrogen; a second gate electrode formed above the second gate insulating film; and a second interfacial layer being formed at an interface between the second gate insulating film and the second gate electrode, and containing a 15-group element.
2. The semiconductor device according to claim 1 , wherein:
the oxidized, nitrided, or oxynitrided bonds in the 13-group element in the first interfacial layer are mostly located in the first sub-layer; and
the metallic bonds are mostly located in the second sub-layer.
3. The semiconductor device according to claim 1 , wherein the 13-group element in the first interfacial layer is boron.
4. The semiconductor device according to claim 1 , wherein:
the first and second gate electrodes are formed with materials having the same work functions; and
the work functions are in the range of 4.55 eV to 4.75 eV.
5. The semiconductor device according to claim 4 , wherein the first and second gate electrodes are formed with metal silicides containing at least one metal of Ni and Co.
6. The semiconductor device according to claim 1 , wherein:
the first gate electrode is formed with a material having a work function in the range of 4.75 eV or more to 5.10 eV or less; and
the second gate electrode is formed with a material having a work function in the range of 4.20 eV or more to 4.55 eV or less.
7. The semiconductor device according to claim 6 , wherein:
the first gate electrode is formed with a first metal silicide containing at least one metal of Ni and Co;
the first metal silicide has a metal-to-silicon composition ratio of 2 or higher;
the second gate electrode is formed with a second metal silicide containing the same metal as the first gate electrode; and
the second metal silicide has a metal-to-silicon composition ratio of 1 or lower.
8. The semiconductor device according to claim 6 , wherein:
the first gate electrode is formed with a first metal silicide containing at least one metal of Ni, Co, Pt, Ir, Ru, Pd, and Re; and
the second gate electrode is formed with a second metal silicide containing at least one metal of Ni, W, Ti, Zr, Hf, Ta, Nb, and Er.
9. The semiconductor device according to claim 1 , further comprising:
a first high-dielectric insulating layer being formed between the n-type semiconductor layer and the first gate insulating layer and containing at least one of a metal oxide, a metal silicon oxide, and a metal silicon oxynitride; and
a second high-dielectric insulating layer being formed between the p-type semiconductor layer and the second gate insulating layer and containing the same material as the first high-dielectric insulating layer.
10. The semiconductor device according to claim 9 , wherein the first and second high-dielectric insulating layers contain HfSiON.