- I thought it would be 2 p orbitals because of 2p6 and 3p2 but apparently that isn’t all of them. Thanks.
Answer by â?? Babygirl Due Sept â??
- The original fermi level of the p and n-regions taken separately are different due to difference in concentration and type of doping. However, at the junction, the energy level diagram usually depicts a common fermi level while conduction and valency bands are displaced. How does that happen?
Answer by epidavros
Energy levels in materials are always relative. In other words, you can say that the conduction band is so many eV above the valence band, but it has no particularly absolute value.
The Fermi level is simply the energy level of the topmost occupied electronic state (at T = 0). Thid once again is relative – you can say where it is with respect to say the valence band.
Until, that is, you join the two materials. When you do this the energy of the topmost occupied state on the n side *must* be the same as that on the p side because the materials are in contact. If it were not, then electrons would flow into the lower energy states across the boundary until they were.
Clearly, for these two levels to be the same across the boundary, the energy bands measured relative to the Fermi level must change, because the band structure must be continuous across the boundary. For this to happen the conduction and valence bands must curve. The origin of this curvature is, of course, and electical potential energy gradient across the junction. This is what gives rise to the intrinsic junction bias.
- I am building a model of a USAAF P-38 Lightning. The model kit comes with two choices as to paint schemes, but I don’t like either. I was wondering if anyone knew what color they were painted during the Normandy beach landings. I can only find black and white photos and it’s hard to tell what color it could be from the many different colors they were painted. Thanks in advance for your help!
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Answer by Wulfgang
Black and white, Invasion stripes.