I have a question about the band diagram asked in Q3.3. Firstly, I have trouble understanding how it should be fundamentally different from Figure 3 given in the homework. In addition, I don't see how this could fulfill the condition where the conduction band offset
\Delta E_C should remain the same (before contact
\Delta E_C > 0, after contact - as shown in Fig.3 - it seems that
\Delta E_C > 0).