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Physics
Atomic and Condensed Matter
Are the positive charges from a hole and a proton ?
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[QUOTE="HARSHARAJ, post: 5615559, member: 607846"] I don't know whether you still have got the question or not but, here a small explanation. The one extra electron has the energy level Ed or the donor energy level. At T=0, i.e. the total freeze out effect such electrons remain at Ed level, as T increases few electron shifts to Ec, leaving behind +ve empty state in Ed energy level, if I am not wrong the energy state you are referring to is a valence band energy state, but the electron that is in contrast is from donor energy state, so it will leave behind an empty state at Ed level and not Ev level, now the transition you are looking for is Ev to Ed transition(i.e. "why not valance band electrons moves to the empty region", as you have asked), but when you increase T, Ed to Ec transition takes place(since this gap is many many times smaller than Ev to Ed gap), and when T is well above 300K Ed becomes almost empty and all electrons shifts from Ed to Ec. Beyond this temperature, electron hole pairs are generated from the valance band and ni(intrinsic carrier concentration) takes over as majority carrier concentration. Now you may say, "so at such high temperature, Ev to Ed transition is possible?", well theoretically even if it does still the electron in no time will then shift from Ed to Ec(since the gap between Ed and Ec is very small and T is very high). So, that's the whole thing. [/QUOTE]
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Are the positive charges from a hole and a proton ?
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