Hi. So we have all seen the band diagram of a PN junction. In order for the fermi level to be the same on both sides, the P bands are shifted up or the N bands are shifted down. Now that the fermi levels are equal, what would happen if you bent the diode into a ring (annulus) shape? How would the bands look that the second junction? Since the fermi levels are already aligned, it's hard for me to understand.(adsbygoogle = window.adsbygoogle || []).push({});

Another thing that's puzzling me is the work function, i.e. the energy difference between the fermi level and the vacuum level. The work functions of N and P type Si are different. But what if we imagine a 1 meter long PN junction. If you measure the workfunction at either end, will you get the same number? I'm thinking you should since the fermi levels are equal.

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# I PN junction loop

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