High-K/Metal Gate - technical definition

The technology in an Intel chip that enabled the fabrication of 45 nm microprocessors in 2007. As elements in the chip were being reduced to 45 nanometers, the gate dielectric began to lose its insulating (dielectric) quality and exhibited too much leakage. The gate dielectric is a very thin insulation layer, traditionally made of silicon dioxide, that lies between the transistor's metal gate electrode and the channel through which the current flows.

Intel's solution to the problem was to combine a hafnium-based dielectric layer, instead of silicon dioxide, with a gate electrode composed of alternative metal materials. The resulting combination yields a "high dielectric constant," otherwise known as a "high-K." See transistor.