Contents
What is the effect of oxide thickness on current ID?
The defect in the oxide layer causes the charge trapping which contributes to the leakage current in the drain current ID. The influence of gate leakage will be increased as the gate voltage is increased. The defect generation in the oxide is probably dependent on the oxide layer thickness.
What is leakage current in Mosfet?
Subthreshold conduction or subthreshold leakage or subthreshold drain current is the current between the source and drain of a MOSFET when the transistor is in subthreshold region, or weak-inversion region, that is, for gate-to-source voltages below the threshold voltage.
What is gate oxide layer?
The gate oxide is the dielectric layer that separates the gate terminal of a MOSFET (metal-oxide-semiconductor field-effect transistor) from the underlying source and drain terminals as well as the conductive channel that connects source and drain when the transistor is turned on.
What is the minimum thickness of an oxide barrier?
The minimum thickness for an ideal oxide barrier is about 0.7 nm. Interfacial roughness contributes at least another 0.6 nm, which puts a lower limit of 1.3 nm on a practical gate oxide thickness.
Which is a major contributor to the leakage current?
Major contributors to the gate leakage current are gate oxide tunneling and injection of hot carrier from substrate to the gate oxide. Gate-induced drain leakage (GIDL) is another significant leakage mechanism, resulting due to the depletion at the drain surface below the gate-drain overlap region.
What are the dimensions of a MOSFET gate?
Currently, the critical dimensions of a MOSFET are the gate length (180 nm), the p–n junction depth (100 nm), and the gate oxide thickness, tox (3–5 nm); the narrowest feature is the gate oxide.
What causes a PN junction drain to leak?
A. pn Junction Reverse-Bias Current Drain and source to well junctions are typically reverse biased, causing pn junction leakage current.