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Distribution of DOS in semiconductor, 0k, green, Screenshot 2021-05-25…
Distribution of DOS in semiconductor
Fermi-Dirac function
The probability of an electron occupies a given state at energy E
in an allowed band
Temperature dependant
Density of States (DOS)/S(E)
The number of energy states per unit volume per unit energy
Probability of DOS to be occupied
Intrinsic semiconductor
To find number of electron
Fermi Probability Function at zero temperature. Probability in CB is zero, in VB is one and in fermi level is 0.5.
Fermi Probability Function at higher temperature. Probability in CB is >0, in VB is <1, and in fermi level not equal to 0.5.
Superimposing S(E) and f(E) will give n(E). (Area under the curves)
Extrinsic semiconductor
n-type. Fermi level nearer to Ec. More electrons in CB.
p-type. Fermi level nearer to Ev. More holes in VB.
