Question 119: Semiconductors and Logic Gates

Question

For extrinsic semiconductors; when doping level is increased;

Accepted Answer

In n-type semiconductor pentavalent impurity is added. Each pentavalent impurity donates a free electron. So the Fermi-level of n-type semiconductor will go upward.
And In p-type semiconductor trivalent impurity is added. Each trivalent impurity creates a hole in the valence band. So the Fermi-level of p-type semiconductor will go downward.

Answer

Fermi-level of both p-type and n-type semiconductors will go upward for T > T
F
K and downward for T < T
F
K, where T
F
is Fermi temperature.

Answer

Fermi-level of p-type semiconductor will go upward and Fermi-level of n-type semiconductors will go downward

Answer

Fermi-level of p and n-type semiconductors will not be affected.

Answer

Fermi-level of p-type semiconductors will go downward and Fermi-level of n-type semiconductor will go upward.

Semiconductors and Logic Gates

For extrinsic semiconductors; when doping level is increased;

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