High-κ dielectric
Material with a high permittivity relative to silicon dioxide / From Wikipedia, the free encyclopedia
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In the semiconductor industry, the term high-κ dielectric refers to a material with a high dielectric constant (κ, kappa), as compared to silicon dioxide. High-κ dielectrics are used in semiconductor manufacturing processes where they are usually used to replace a silicon dioxide gate dielectric or another dielectric layer of a device. The implementation of high-κ gate dielectrics is one of several strategies developed to allow further miniaturization of microelectronic components, colloquially referred to as extending Moore's Law.
Sometimes these materials are called "high-k" (pronounced "high kay"), instead of "high-κ" (high kappa).