engineering recuitment GATE ECE 2023-24 Test Series Electronic Devices Carriers in Semiconductors Extrinsic Fermi Level
Which of the following statement(s) is/are valid with respect to Fermi level of a semiconductor.
EFi → Fermi level of intrinsic semiconductor
EFP → Fermi level of P-type semiconductor
EFn → Fermi level of n-type semiconductor
1
For P-type semiconductor, fermi level lies close to conductor band.
2
If mn = mp, the intrinsic Fermi level (EFi) lies in the middle of the conduction and valence band.
mn = Effective mass of Electron
mp = Effective mass of Hole
3
For N-type semiconductor, as temperature increases EFn starts moving close to center of forbidden band.
4
As doping concentration increases in n- type EFn moves closer to EFi