What it is and the problem it solves
It is a MOSFET with more than one gate on a single transistor. It solves short-channel effects that arise when planar transistors shrink below ~32 nm.
How it works
A multigate device places more than one gate around the transistor channel — on multiple surfaces — to improve electrostatic control.
What works
Multigate devices suppress off-state leakage current more effectively than planar transistors. They also enhance on-state drive current. N-channel FinFETs reached 17 nm in 1998. A 25 nm FinFET operating at 0.7 V was demonstrated in December 2002.
What does not
It does not eliminate short-channel effects entirely. It mitigates them — but requires new fabrication complexity, and bulk FinFETs only enabled mass production in 2004, years after lab demonstrations.
What it changes
It underpins all sub-32 nm technologies. Without it, further planar MOSFET scaling would have stalled due to leakage and drive current limits.
Is it worth your time
Yes, if you work on sub-32 nm semiconductor design or power-constrained logic. It is not optional for modern CMOS scaling.
