Composition of mosfet, Electrical Engineering

Composition of MOSFET

 In a test pattern the Photomicrograph of two metal-gate MOSFETs. Probe pads for two gates and three source or drain nodes are entitled.Generally the semiconductor of choice is silicon, but various chip manufacturers, most notably IBM and intel, currently started using a chemical compound of silicon and germanium (SiGe) in MOSFET channels. Unfortunately, several semiconductors with better electrical properties than silicon, like gallium arsenide, do not make good semiconductor-to-insulator interfaces, so are not suitable for MOSFETs. Research carries on creating insulators with acceptable electrical characteristics on another semiconductor material.

In order to conquer power consumption increase because of gate current leakage, high-κ dielectric replaces silicon dioxide for the gate insulator, whereas metal gates return by replacing polysilicon.The gate is separated from the channel through a thin insulating layer, usually of silicon dioxide and later of silicon oxynitride. A number of companies have started to introduce a high-κ dielectric + metal gate combination in the 45 nanometer node.

While a voltage is applied in between the gate and body terminals, the electric field generated penetrates by the oxide and creates an "inversion layer" or "channel" at the semiconductor-insulator interface. The inversion channel is of similar type, P-type or N-type, as the source and drain, so it gives a channel via which current can pass. Varying the voltage in between the gate and body modulates the conductivity of this layer and permits to control the current flow among the drain and source.

Posted Date: 1/11/2013 1:00:59 AM | Location : United States







Related Discussions:- Composition of mosfet, Assignment Help, Ask Question on Composition of mosfet, Get Answer, Expert's Help, Composition of mosfet Discussions

Write discussion on Composition of mosfet
Your posts are moderated
Related Questions
Q. Draw the complete circuit of a dual voltage source using 7805 and 7905. A voltage regulator is a circuit that supplies a constant voltage regardless of changes in load curre

Q. Write a note on feedback of emitter follower? The emitter follower can be seen to be an example of negative feedback when the relationship is put in the form

ON output plot of a JFET n-channel transistor if ID is close to IDSS does the value of VGS close to VP?

Quite often an amplifier is used as a component of an amplifier circuit. Consider the amplifier circuit shown in Figure, which contains an amplifier block as an internal component.

Explain Acceptance cone? The fibre air - core interface is display below: In this figure Omax is the maximum angle, inside that the rays undergo total internal reflecti

Ferromagnetic materials have some 'residual magnetism' even when the current (proportional to H) is zero. Material with strong residual magnetism are useful for making permanent ma

Q. A JK flip-flop is shown in Figure (a). (a) Modify it to operate like the D flip-flop of Figure (b). (b) Modify the JK flip-flop to operate like the T flip-flop of Figure (

What is reading mechanism of a 3 phase meter?

Describe the term (i) Automation (ii) Automated lines 04 List out the reasons for automation and discuss in detail the process of work part transport.

In a 3-stage continuous ultrafiltration process, a solution is concentrated from 5 gm/Liter to 50 gm/Liter of protein. The final retentate is to have a flow rate of 1000 L/hr. The