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ETE411 :: Lec16MOS Dr. MashiurRahman Copyright: Semiconductor Physics And Devices 3rd ed. - J. Neamen
Basic MOS capacitor structure
How it works? A parallel-plate capacitor showing the electric field and conductor charges A corresponding MOS capacitor with a negative gate bias showing the electric field and charge flow The MOS capacitor with an accumulation layer of holes
MOS capacitor with a moderate positive gate bias Induced space charge region Electric field and charge flow
MOS capacitor with a p-type substrate A negative gate bias Moderate positive gate bias We have inverted the surface of the semiconductor from a p-type to an n-type semiconductor
A “large” positive gate bias
N-type substrate Positive gate bias Moderate negative gate bias
MOS with n-type substrate Positive gate bias Moderate negative gate bias A “large” negative gate bias
Depletion layer thickness Acceptor doping concentration Surface potential Permittivity of the semiconductor
Maximum space charge width Фs = 2 Фfp eФs = 2e Фfp This condition is known as threshold inversion point Applied voltage is the threshold voltage
Quiz 6 Quiz 6 will be held on Tuesday 4 July.  Lec 13 Lec 14 Mid 2 (8 August, Saturday) Lec 8 - Lec 15 Votes: 10-1: 0 2-4:  5 person 3-5: 14 person 6-8: 9 person
The energy-band diagram in the n-type semiconductor at the threshold inversion point

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Ete411 Lec16 Mos

  • 1. ETE411 :: Lec16MOS Dr. MashiurRahman Copyright: Semiconductor Physics And Devices 3rd ed. - J. Neamen
  • 3. How it works? A parallel-plate capacitor showing the electric field and conductor charges A corresponding MOS capacitor with a negative gate bias showing the electric field and charge flow The MOS capacitor with an accumulation layer of holes
  • 4. MOS capacitor with a moderate positive gate bias Induced space charge region Electric field and charge flow
  • 5. MOS capacitor with a p-type substrate A negative gate bias Moderate positive gate bias We have inverted the surface of the semiconductor from a p-type to an n-type semiconductor
  • 7. N-type substrate Positive gate bias Moderate negative gate bias
  • 8. MOS with n-type substrate Positive gate bias Moderate negative gate bias A “large” negative gate bias
  • 9. Depletion layer thickness Acceptor doping concentration Surface potential Permittivity of the semiconductor
  • 10. Maximum space charge width Фs = 2 Фfp eФs = 2e Фfp This condition is known as threshold inversion point Applied voltage is the threshold voltage
  • 11. Quiz 6 Quiz 6 will be held on Tuesday 4 July. Lec 13 Lec 14 Mid 2 (8 August, Saturday) Lec 8 - Lec 15 Votes: 10-1: 0 2-4: 5 person 3-5: 14 person 6-8: 9 person
  • 12. The energy-band diagram in the n-type semiconductor at the threshold inversion point