MOS-Capacitor: Investigating Depletion Region Neutralization

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SUMMARY

The discussion centers on the behavior of a p-MOS capacitor when a positive gate voltage is applied, resulting in a depletion region due to the repulsion of holes from the semiconductor-oxide interface. It is established that injecting negative charges (electrons) from the back contact can neutralize the depletion region, provided the gate voltage remains constant. This process alters the threshold voltage of the capacitor, demonstrating the relationship between charge injection and depletion region dynamics.

PREREQUISITES
  • Understanding of p-MOS capacitor operation
  • Knowledge of semiconductor physics, specifically depletion regions
  • Familiarity with gate voltage effects on MOS structures
  • Basic principles of charge injection in semiconductor devices
NEXT STEPS
  • Research the effects of gate voltage on p-MOS capacitors
  • Study charge injection techniques in semiconductor devices
  • Explore the relationship between threshold voltage and depletion regions
  • Investigate the implications of depletion region neutralization on device performance
USEFUL FOR

Electrical engineers, semiconductor physicists, and students studying MOS technology who are interested in the dynamics of p-MOS capacitors and charge injection effects.

1msm
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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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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.
 

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