High performance CMOS surrounding gate transistor (SGT) for ultra high density LSIs

A novel transistor with compact structure has been developed for MOS devices. This transistor, whose gate electrode surrounds the pillar silicon island, reduces the occupied area for all kinds of circuits. For example, the occupied area of a CMOS inverter can be shrunk to 50% of that using planar transistors. The other advantages are steep cutoff characteristics, very small substrate bias effects, and high reliability. These features are due to the unique structure, which results in greater gate controllability and in electric field relaxation at the drain edge.<>