2. Electronics and Devices

Semiconductor Physics — Quiz

Test your understanding of semiconductor physics with 5 practice questions.

Practice Questions

Question 1

What is the position of the Fermi level in the energy band diagram of an intrinsic semiconductor at thermal equilibrium?

Question 2

What primary physical process leads to the formation of the built-in potential at a PN junction when p-type and n-type materials are first joined?

Question 3

In an n-type silicon sample with electron concentration $n=1\times10^{22}\,\mathrm m^{-3}$, electron mobility $\mu_n=0.14\,\mathrm{m^2/V\,s}$, and an applied electric field $E=1000\,\mathrm V/m$, what is the electron drift current density $J_n$?

Question 4

Which recombination mechanism involves three charge carriers and becomes significant at high doping concentrations in semiconductors?

Question 5

Given conduction band effective density of states $N_C=2.8\times10^{25}\,\mathrm m^{-3}$, valence band effective density of states $N_V=1.04\times10^{25}\,\mathrm m^{-3}$, bandgap energy $E_g=1.12\,\mathrm eV$, and $kT/q=0.026\,\mathrm V$ at 300\,K, what is the intrinsic carrier concentration $n_i$?