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High-k dielectric : ウィキペディア英語版
High-κ dielectric
The term high-κ dielectric refers to a material with a high dielectric constant κ (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" instead of "high-κ" (high kappa).
==Need for high-κ materials==

Silicon dioxide (SiO2) has been used as a gate oxide material for decades. As transistors have decreased in size, the thickness of the silicon dioxide gate dielectric has steadily decreased to increase the gate capacitance and thereby drive current, raising device performance. As the thickness scales below 2 nm, leakage currents due to tunneling increase drastically, leading to high power consumption and reduced device reliability. Replacing the silicon dioxide gate dielectric with a high-κ material allows increased gate capacitance without the associated leakage effects.

抄文引用元・出典: フリー百科事典『 ウィキペディア(Wikipedia)
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