MOS-Capacitor: Investigating Depletion Region Neutralization

In summary, the conversation discusses the effects of placing a positive gate voltage on a p-MOS capacitor, resulting in a depletion region. The question is raised whether injecting negative charges into the semiconductor from its back contact will neutralize the depletion region, with the conclusion that it would if the gate voltage is held constant.
  • #1
1msm
8
0
Hello everyone,
My question is about MOS-capacitor,
We know that, If we place +ve gate voltage on p-MOS capacitor holes are repelled from semiconductor-oxide interface leaving behind negative charge due to ionized acceptor ions,This results in a depletion region.
Now the question is, If we injected the required negative charges (electrons) into semiconductor from its back contact is the depletion region is going to vanish(neutralization)...??
 
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  • #2
1msm said:
Hello everyone,
My question is about MOS-capacitor,
We know that, If we place +ve gate voltage on p-MOS capacitor holes are repelled from semiconductor-oxide interface leaving behind negative charge due to ionized acceptor ions,This results in a depletion region.
Now the question is, If we injected the required negative charges (electrons) into semiconductor from its back contact is the depletion region is going to vanish(neutralization)...??

Yes, if we hold the gate voltage constant. Injecting charges would change the threshold voltage of the capacitor.
 

What is a MOS-Capacitor?

A MOS-Capacitor, or metal-oxide-semiconductor capacitor, is a type of semiconductor device that consists of a metal electrode, an insulating oxide layer, and a semiconductor material. It is commonly used in electronic circuits for energy storage and signal processing.

How does a MOS-Capacitor work?

A MOS-Capacitor works by creating a depletion region, or a region with no free charge carriers, between the metal electrode and the semiconductor material. This depletion region acts as a dielectric, or insulating layer, and stores energy in the form of an electric field.

What is depletion region neutralization?

Depletion region neutralization is the process of reducing or eliminating the depletion region in a MOS-Capacitor. This can be done by applying a voltage to the metal electrode, which attracts free charge carriers from the semiconductor material and reduces the size of the depletion region.

Why is investigating depletion region neutralization important?

Investigating depletion region neutralization is important because it allows us to understand the behavior of MOS-Capacitors and how they can be controlled for specific applications. It also helps us improve the design and performance of electronic devices that use MOS-Capacitors.

What are some methods for investigating depletion region neutralization?

Some methods for investigating depletion region neutralization include using electrical measurements, such as capacitance-voltage measurements, to observe changes in the depletion region. Other techniques include using scanning electron microscopy to visualize the depletion region, or using simulations to model the behavior of the MOS-Capacitor.

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