Question

draw the energy band diagram of an n-type semiconductor​

Answer 1

Explanation:

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Answer 2

Answer:

(1) An n-type semiconductor is formed when a crystal of silicon or germanium is doped with a pentavalent impurity such as phosphorus, arsenic or antimony.

(2) Four of the five electrons of an impurity atom form covalent bonds with four nearest- neighbour atoms.

(3) The fifth electron of the pentavalent atom is weakly bound and is readily raised to the conduction band by thermal energy. For example, the ionisation energy of antimony is 0.05 eV in Si and 0.01 eV in Ge, which are much less than the band gap energy in Si or Ge. Thus, the donor impurity atoms add electrons to the conduction band without creating holes in the valence band.

(4) Free electrons contributed by impurity atoms greatly increase the small concentration of free electrons already present in the material due to thermal energy