FinFETtransistors

FinFET transistors, or FinFETs, are a nonplanar MOSFET technology used in modern integrated circuits. The conducting channel sits in a thin fin of silicon that protrudes from the substrate. A gate electrode wraps around the fin on at least three sides, typically the top and both sidewalls, providing enhanced electrostatic control compared with planar transistors.

This tri-gate geometry improves gate control over the channel, reducing short-channel effects, lowering off-state leakage, and enabling higher drive currents per unit area. As a result, FinFETs support continued scaling to smaller nodes and can offer better energy efficiency for the same performance.

Fabrication relies on advanced lithography and materials, including high-k dielectrics and metal gate stacks. The fins must be precisely defined in width, height, and pitch, and the devices can be implemented on bulk silicon or on silicon-on-insulator substrates. The manufacturing process is more complex than for planar transistors, contributing to higher fabrication costs.

FinFET technology began to be adopted in the early 2010s, with major foundries and device makers integrating tri-gate FinFETs in sub-22 nm processes. In subsequent nodes, the technology remained standard, while research has moved toward gate-all-around nanosheet and nanowire structures to sustain scaling and parasitic control.