Draw the flat band profile for an Al0.4Ga0.6AsGaAs junction. [2 marks] Given that the bandgaps of AlAs and GaAs are 2.2eV and 1.4eV respectively, calculate the conduction and valence band discontinuities. [3 marks] Redraw the band profile, taking into account any band bending, based on the following scenarios: (i) Al0.4Ga0.6As and GaAs are both n-type [3 marks] (ii) Al0.4Ga0.6As and GaAs are both p-type [3 marks]