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US 7,405,451 B2Granted
Semiconductor device including MIS transistors
AssigneeKabushiki Kaisha Toshiba
InventorsTatsuo Shimizu, Takeshi Yamaguchi, Yukie Nishikawa
Life of this patent
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Abstract
The present invention is to obtain an MIS transistor which allows considerable reduction in threshold fluctuation for each transistor and has a low threshold voltage. First gate electrode material for nMIS and second gate electrode material for pMIS can be mutually converted to each other, so that a process can be simplified. Such a fact that a dependency of a work function on a doping amount is small is first disclosed, so that fluctuation in threshold voltage for each transistor hardly occurs.
Claims4
A semiconductor device comprising:
- an nMIS transistor including:
- a first gate insulating film which is formed on a semiconductor substrate;
- a first gate electrode formed on the first gate insulating film and including a first electrically conductive oxide film where a work function φm (eV) is in a range of 3.65≦φm≦4.45, the first electrically conductive oxide film comprising a Perovskite structure type oxide represented by ABO3 or a Perovskite structure type oxynitride represented by ABON, where A is at least one element selected from an A1 or A2 group and B is at least one element selected from a B1 or B2 group, the A1 group being alkaline earth metals and rare earth metals, the A2 group being La and Y, the B1 group being Ti, Zr, Hf, and Ce, the B2 group being Ta, Nb, and V, and the first electrically conductive oxide film including at least one element selected from the A2 group or the B2 group;
- and
- first source-drain regions formed on the semiconductor substrate on both sides of the first gate electrode;
- and
- a pMIS transistor including:
- a second gate insulating film formed on the semiconductor substrate;
- a second gate electrode formed on the second gate insulating film and including a second electrically conductive oxide film where a work function φm (eV) is in a range of 4.77≦φm≦5.57, the second electrically conductive oxide film comprising a Perovskite structure type oxide of CDO3 or a Perovskite structure type oxynitride represented by CDON, where C is at least one element selected from a C1 or C2 group and D is at least one element selected from a D1 or D2 group, the C1 group being alkaline earth metals and rare earth metals, the C2 group being La and Y, the D1 group being Ti, Zr, Hf, and Ce, the D2 group being W, Mo, Cr, Re, Tc, Mn, Os, Ru, Fe, Ir, Rh, Co, Pt, Pd, and Ni;
- and
- second source-drain regions formed on the semiconductor substrate on both sides of the second gate electrode.
8 more elements
A semiconductor device comprising:
- an nMIS transistor including:
- a first gate insulating film which is formed on a semiconductor substrate;
- a first gate electrode formed on the first gate insulating film and including a first electrically conductive oxide film where a work function φm (eV) is in a range of 3.65≦φm≦4.45, the first electrically conductive oxide film comprising a Perovskite structure type oxide represented by ABO3 or a Perovskite structure type oxynitride represented by ABON, where A is at least one element selected from an A1 or A2 group and B is at least one element selected from a B1 or B2 group, the A1 group being alkaline earth metals and rare earth metals, the A2 group being La and Y, the B1 group being Ti, Zr, Hf and Ce, the B2 group being Ta, Nb, and V, and the first electrically conductive oxide film including at least one element selected from the A2 group or the B2 group;
- and
- first source-drain regions formed on the semiconductor substrate on both sides of the first gate electrode;
- and
- a pMIS transistor including:
- a second gate insulating film formed on the semiconductor substrate;
- a second gate electrode formed on the second gate insulating film and including a second electrically conductive oxide film where a work function φm (eV) is in a range of 4.77=φm≦5.57, the second electrically conductive oxide film comprising a rutile structure type oxide represented by XO2 or a rutile structure type oxynitride represented by XON, where X includes at least one element selected from an X1 or X2 group groups, the X1 group being Ti, Zr, Hf, and Ce, the X2 group being W, Mo, Cr, Re, Tc, Mn, Os, Ru, Fe, Ir, Rh, Co, Pt, Pd, and Ni;
- and
- second source-drain regions formed on the semiconductor substrate on both sides of the second gate electrode.
8 more elements
A semiconductor device comprising:
- an nMIS transistor including:
- a first gate insulating film which is formed on a semiconductor substrate;
- a first gate electrode formed on the first gate insulating film and including a first electrically conductive oxide film where a work function φm (eV) is in a range of 3.65≦φm≦4.45, the first electrically conductive oxide film comprising a rutile structure type oxide represented by AO2 or a rutile structure type oxynitride represented by AON, where A includes at least one element selected from an A1 group and at least one element selected from an A2 group, the A1 group being Ti, Zr, Hf and Ce, and the A2 group being Ta, Nb, and V;
- and
- first source-drain regions formed on the semiconductor substrate on both sides of the first gate electrode;
- and
- a pMIS transistor including:
- a second gate insulating film formed on the semiconductor substrate;
- a second gate electrode formed on the second gate insulating film and including a second electrically conductive oxide film where a work function φm (eV) is in a range of 4.77≦φm≦5.57, the second electrically conductive oxide film comprising a Perovskite structure type oxide represented by CDO3 or a Perovskite structure type oxynitride represented by CDON, where C is at least one element selected from a C1 or C2 group and D is at least one element selected from a D1 or D2 group, the C1 group being alkaline earth metals and rare earth metals, the C2 group being La and Y, the D1 group being Ti, Zr, Ht and Ce, the D2 group being W, Mo, Cr, Re, Tc, Mn, Os, Ru, Fe, Ir, Rh, Co, Pt, Pd, and Ni;
- and
- second source-drain regions formed on the semiconductor substrate on both sides of the second gate electrode.
8 more elements
A semiconductor device comprising:
- an nMIS transistor including:
- a first gate insulating film which is formed on a semiconductor substrate;
- a first gate electrode formed on the first gate insulating film and including a first electrically conductive oxide film where a work function φm (eV) is in a range of 3.65≦φm≦4.45, the first electrically conductive oxide film comprising a rutile structure type oxide represented by AO2 or a rutile structure type oxynitride represented by AON, where A includes at least one element selected from an A1 group and at least one element selected from an A2 group, the A1 group being Ti, Zr, Hf, and Ce, and the A2 group being Ta, Nb, and V;
- and
- first source-drain regions formed on the semiconductor substrate on both sides of the first gate electrode;
- and
- a pMIS transistor including:
- a second gate insulating film formed on the semiconductor substrate;
- a second gate electrode formed on the second gate insulating film and including a second electrically conductive oxide film where a work function φm (eV) is in a range of 4.77≦φm≦5.5, the second electrically conductive oxide film comprising a rutile structure type oxide represented by XO2 or a rutile structure type oxynitride represented by XON, where X includes at least one element selected from an X1 or X2 group, the X1 group being Ti, Zr, Hf, and Ce, the X2 group being W, Mo, Cr, Re, Tc, Mn, Os, Ru, Fe, Ir, Rh, Co, Pt, Pd, and Ni;
- and
- second source-drain regions formed on the semiconductor substrate on both sides of the second gate electrode.
8 more elements
Dependencies are inferred from the claim text.