1. If the above sample is n-type and the electron concentration at the location x1 is N(x1)=1016cm-3, what is the drift current density in A/cm2? What is the concentration gradient at this point, dN(x1)/dx?
2. Define and derive the quasi-Fermi energy and potential for a species of ions.
3. Define and derive the quasi-Fermi energy and potential for a species of neutral atoms.