Consider n-p Al0.3Ga0.7As/GaAs abrupt heterojunction with Nd = 1.0 x 10^17 cm^-3 and Na = 1.0 x 10^19 cm^-3. The Nc and Nv are both equal to 1.0 x 10^19 cm^-3. The bandgap of AlGaAs is 1.72 eV and GaAs is 1.42 eV. Assume ΔEc = 0.2 eV and ΔEv = 0.1 eV. Assume the dielectric constant of both AlGaAs and GaAs are the same.
a) Calculate Vbi.
b) Calculate the depletion width.
c) Draw the charge profile, electric field profile, and band diagram CLEARLY and QUANTITATIVELY (as much as possible).
d) Calculate the electron and hole barrier heights.
e) Finally, calculate JN/JP.