Gate oxide
Dielectric layer separating MOSFET gate from channel.
Gate oxide is the dielectric layer that separates the gate terminal of a MOSFET from the underlying source and drain terminals as well as the conductive channel. It is formed by thermal oxidation of silicon to create a thin insulating layer of silicon dioxide, typically 5 to 200 nm thick. The gate oxide is critical for transistor operation, allowing the gate to sustain a transverse electric field of 1 to 5 MV/cm to modulate channel conductance.
- field
- Semiconductor device physics
- known_for
- Dielectric layer in MOSFETs enabling gate control of channel conductance
- first_gate_oxide
- 1957 by Carl Frosch and Lincoln Derrick at Bell Labs
- first_10_nm_gate_oxide
- 1987 by Bijan Davari at IBM Thomas J. Watson Research Center
Lore & Background
In 1955, Carl Frosch and Lincoln Derrick accidentally grew an oxide layer over silicon at Bell Labs and patented their method. By 1957, they were aware of surface passivation by silicon dioxide and made the first gate oxide for a transistor. The gate oxide is formed through self-limiting oxidation described by the Deal–Grove model, and a conductive gate material is subsequently deposited over it.
Reader's Guide
Gate oxide is a foundational component of MOSFET technology, which underpins modern integrated circuits. Its electrical properties are critical for forming the inversion channel that allows current flow between source and drain. Overstressing the gate oxide can lead to gate rupture or stress-induced leakage current, a common failure mode. During manufacturing, reactive-ion-etching may damage the gate oxide via the antenna effect. The historical development from Frosch and Derrick's accidental discovery to Davari's 10 nm gate oxide in 1987 illustrates the scaling that enabled higher transistor densities.
Did You Know?
- Gate oxide is typically 5 to 200 nm thick.
- The gate oxide can sustain a transverse electric field of 1 to 5 MV/cm.
- Overstressing the gate oxide may lead to gate rupture or stress-induced leakage current.
- The first gate oxide for a transistor was made in 1957 by Carl Frosch and Lincoln Derrick.
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