Design a pn junction (by choosing N_d and Nₐ) so that the electron injection efficiency is > 0.99.
a) Nd=10¹⁶,Nₐ=10¹⁸
b) Nd=10¹⁸,Nₐ=10¹⁶
c) Nd=10¹⁴,Nₐ=10¹⁶
d) Nd=10¹⁶,Nₐ=10¹⁴