Patent ID: 7566617

Claim:
A method for manufacturing a semiconductor elemental device, comprising: preparing a base substrate; forming a high dielectric amorphous film composed of a high permittivity material over the base substrate; forming an amorphous silicon film over the high dielectric amorphous film using an amorphization temperature of the high permittivity material as a deposition temperature of the amorphous silicon film; forming photoresist masks over the amorphous silicon film in gate forming regions by photolithography; removing the amorphous silicon film in gate non-forming regions by dry etching using the photoresist masks to expose the high dielectric amorphous film and so that the amorphous silicon film in the gate forming regions remain as gate electrode forming films; removing the photoresist masks; performing wet etching with the gate electrode forming films as masks after said removing the photoresist masks, so that portions of the high dielectric amorphous film covered by the gate electrode forming films remain and so that exposed portions of the high dielectric amorphous film are removed; and heat-treating the remaining gate electrode forming films after said performing wet etching, to reform the remaining gate electrode forming films into polysilicon gate electrodes.