Semiconductor device and its manufacturing method
DCFirst Claim
1. A semiconductor device comprising an N-channel metal-insulator-semiconductor field-effect transistor and a P-channel metal-insulator-semiconductor field-effect transistor, characterized in that said N-channel metal-insulator-semiconductor field-effect transistor includes a gate electrode made of a metal, alloy or metal nitride film doped with oxygen or fluorine, and that said P-channel metal-insulator-semiconductor field-effect transistor includes a gate electrode formed in a common layer with said gate electrode of said N-channel metal-insulator-semiconductor field-effect transistor and made from a portion of said common layer doped with oxygen or fluorine more heavily than said gate electrode of said N-channel metal-insulator-semiconductor field-effect transistor.
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Abstract
A method for manufacturing a semiconductor device wherein both the threshold voltages of an N-type MISFET and a P-type MISFET are low, device can be easily manufactured at a lower cost and a higher product yield, and the reliability of the gate insulation film is higher. The gate insulation film is formed on the surface of a silicon substrate 1 in N-type MISFET forming region and the P-type MISFET forming region, and metal gates 4 and 5 are provided thereon. The metal gate 4 is made from a TiCoN film, and the work function thereof is set at 4.0 to 4.8 eV suited to the gate electrode material of the N-type MISFET. The metal gate 5 is formed from a portion of the TiCoN film by ion-implantation of oxygen into the TiCoN film configuring the gate electrode 4 at a dosage of 1013 to 1014 (ions/cm2) to raise the work function by around 0.2 to 0.8 eV.
19 Citations
19 Claims
- 1. A semiconductor device comprising an N-channel metal-insulator-semiconductor field-effect transistor and a P-channel metal-insulator-semiconductor field-effect transistor, characterized in that said N-channel metal-insulator-semiconductor field-effect transistor includes a gate electrode made of a metal, alloy or metal nitride film doped with oxygen or fluorine, and that said P-channel metal-insulator-semiconductor field-effect transistor includes a gate electrode formed in a common layer with said gate electrode of said N-channel metal-insulator-semiconductor field-effect transistor and made from a portion of said common layer doped with oxygen or fluorine more heavily than said gate electrode of said N-channel metal-insulator-semiconductor field-effect transistor.
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2. A semiconductor device comprising an N-channel metal-insulator-semiconductor field-effect transistor and a P-channel metal-insulator-semiconductor field-effect transistor, characterized in that said N-channel metal-insulator-semiconductor field-effect transistor includes a gate electrode made from a metal, alloy or metal nitride film, and that said P-channel metal-insulator-semiconductor field-effect transistor includes a gate electrode formed in a common layer with said gate electrode of said N-channel metal-insulator-semiconductor field-effect transistor and made from a portion of said common layer doped with oxygen or fluorine.
Specification