in n-type semiconductor why increase in temperature increase hole concentration not of free electrons?

Answer 1

as we all know, higher temperature, the electrons will get more energy.
when electrons get more energy, they will become more active.
when more active they will jump out from the place they were previously. what i mean is they will jump more faster and more regular than before.
ok now, common sense, the more they jump, they more more holes will be create.
(as we all know, electrons occupy the holes.)
this is the answer.

simpe and clear

mentioning about group VA of the periodic table (eg. phosphorus (P), arsenic (As), or antimony (Sb)), which incorporate into the crystal lattice in place of a Si atom, and their extra electrons are only weakly bound to the atom...dun really explain the situation.

Answer 2

I note that N-type does not refer to free electrons per se, but rather to atoms with five valence electrons, such as those from group VA of the periodic table (eg. phosphorus (P), arsenic (As), or antimony (Sb)), which incorporate into the crystal lattice in place of a Si atom, and their extra electrons are only weakly bound to the atom such that at normal temperatures, ALL such electrons are excited into the conduction band anyway. Perhaps Increasing the temperature ruins the lattice, thereby lowering the efficiency / potency of the N-type material (i.e. decreasing the availability of e-donation by the dopant)? If so, your question devolves into an inquiry of the latter process.

On second thought, another aspect is probably that, at progressively higher temperatures, more and more of the remaining (non-valence) electrons, which are more tightly held by the nucleus begin to get enough energy to enter the valence band and leave a hole behind. But these electrons would not return easily.

Answer 3

This is a new one on me. The initial N conductors are a function of the amount of dopant that you add to the semi-conductor. Any thermal excitation will create hole-electron pairs. Thermal energy cannot create a hole without liberating an electron. The mobility goes down with increased temperature so the drift velocity of the electrons gets slower but I cannot imagine how only holes get created. The electrons cannot just disappear.