Patent ID: 7157317
Filing Date: 2007-01-02
Classification: H01L

Abstract:
1. A manufacturing method for a field-effect transistor, comprising: forming a first insulation film over a crystalline semiconductor; forming a gate insulation film over a portion of the crystalline semiconductor by patterning the first insulation film; introducing an impurity having one conductivity type to the crystalline semiconductor by using the gate insulation film as a mask; forming an oxide film by oxidizing a surface of the crystalline semiconductor by using an oxidizing water solution; forming a conductive film on the oxide film and the gate insulation film; simultaneously forming a gate electrode, a source electrode, a drain electrode by patterning the conductive film; introducing an impurity having one conductivity type to the crystalline semiconductor by using the gate electrode, the source electrode, and the drain electrode as masks; and heating the crystalline semiconductor, the oxide film, the gate insulation film, the gate electrode, the source electrode, and the drain electrode in an inert gas ambient at a temperature of from 800° C. to 1050° C. for a time period of from 30 minutes to 4 hours.