« on: Today at 09:56:38 »
Hi ES, I read your post yesterday around midday but I was rather busy at the time so I did not reply. I certainly agree that Alan is an excellent contributor. However I doubt if I can be of any value as my semiconductor theory(50 years ago) was extremely rudimentary as opposed to semiconductor application. I have a query peripheral to yours and I hope I am not digressing too much: the permittivity of a material is a bulk property that is due to polarisation of charges within that material--does this have a real meaning at the atomic scale?, ie is it not just a case of vacuum permittivity+ whatever electrostatic effects are occurring locally? Another conundrum for me is why electron and hole mobility varies when a hole is effectively an electron moving in the opposite direction, step by step. Apologies if this is too much off topic.