Recent content by imad

here I found this diagram, see attachment, so that I can put my question in a clear way. this is a pn-junction, on both sides is the same material but different doping, p and n, so before we bring them in contact only the fermi levels are different but the energy levels are equal. after the...

so the diagram is wrong because in the diagram the conduction and valence band energies remain constant at the interface, and decay as you go deeper in the bulk!

what about the conduction and valence band levels deep in the semiconductor. they seem to be shifted in the figure, so their value before is different from their value after making the contact, though no charge density change happens their. is it really the case?

hi marlon, thanks for your reply.. that was good what you said, in the first reply, it's indeed the change of charge density near the contact what causes the band bending, so in the case of the n-semiconductor the left positive donors raise the energy of the energy levels at that region. What's...

I am confused here and hope to get help from you physicians..the assistant in the uni could not help me.. when we have a junction between two materials with different fermi levels, for example a metal and a semiconductor, we say the fermi level of the semiconductor gets shifted till it's equal...