| 摘要 |
A semiconductor device-which includes surface-type n-channel and p-channel single gate transistors by formation of fixed charges within a gate oxide film-and a manufacturing method therefor. A voltage is applied between an electrode connected to a gate electrode and an electrode connected to an N+ region formed in an n-well, and electrons are implanted into the gate electrode at high energy from a substrate, thereby producing fixed negative electric charges in a gate oxide film within an range of 1E11 cm-2 to 1E14 cm-2. An appropriate value for Vth is obtained in the surface channel MOSFET. Therefore, there are solved problems associated with a dual gate structure; namely, a complicated process flow, etch residues or excessive etching due to a difference in etch rate between n-type polycrystalline silicon and p-type polycrystalline silicon, and the deterioration of a gate oxide film due to penetration of boron ions.
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