| 摘要 |
An extremely short channel Field Effect Transistor(FET) is made by making a first ion implant through a polysilicon mask aperture, converting the surface of the polysilicon into SiO2 to constrict the aperture size and then making a second ion implant of the opposite type impurity through the constricted aperture. The SiO2 growth effectively moves the edge of the mask by a small controlled distance. This permits a small controlled spacing between the two ion implants, which is used for defining an extremely short FET channel. Alternatively a bipolar transistor with a narrow base zone can be made by analogous processing. - i |
