What is Inversion layer?
A layer formed at the semiconductor surface by the gate voltage, where carriers of the type opposite to the substrate gather. It becomes the MOSFET's channel.
Field: MOSFET
Inversion layer in the explanations
Electrons in the inversion layer are confined in a narrow well by the strong interface field, and quantum effects place their distribution peak about 1 nm inside rather than right at the interface.
In a MOSFET with a very thin gate insulator, what is the ef…In an enhancement-mode nMOSFET, a positive gate voltage above Vth draws electrons to the surface of the p-type substrate, forming an inversion layer (channel) so current flows between source and drain.
What is the condition for an enhancement-mode n-channel MOS…In a pMOS, applying a gate voltage below the source forms a hole inversion layer at the surface of the n-type body (n-well), turning it on.
What is the sign of the threshold voltage (relative to the …
Questions that mention Inversion layer (5)
- In a MOSFET with a very thin gate insulator, what is the effect of the electron distribution in the inversion layer peaking slightly away from the interface?
- What is the condition for an enhancement-mode n-channel MOSFET to turn on (conduct)? (VGS: gate-source voltage, Vth: threshold voltage)
- What is the sign of the threshold voltage (relative to the source) of an enhancement-mode p-channel MOSFET?
- Which carriers carry the current in the channel of an n-channel MOSFET?
- In a high-frequency C-V measurement of a MOS capacitor on a p-type substrate, what happens to the capacitance when a large positive gate voltage drives the surface into strong inversion?
Related terms
Threshold voltage EOT (equivalent oxide thickness) Mobility Junction capacitance (depletion capacitance) Body effect Channel-length modulation CMOS DIBL Flat-band voltage GIDL (gate-induced drain leakage)