Semiconductors

JEE Main level, single correct, medium

15 of 209

Question 15 of 209

Consider a n-type semiconductor in which ne\mathrm{n}_{\mathrm{e}} and nh\mathrm{n}_{\mathrm{h}} are number of electrons and holes, respectively.
(A) Holes are minority carriers

(B) The dopant is a pentavalent atom

(C)
nenh≠ni2\mathrm{n}_{\mathrm{e}} \mathrm{n}_{\mathrm{h}} \neq \mathrm{n}_{\mathrm{i}}^2
(where
nin_i is number of electrons or holes in semiconductor when it is intrinsic form)
(D)
nenh≥ni2\mathrm{n}_{\mathrm{e}} \mathrm{n}_{\mathrm{h}} \geq \mathrm{n}_{\mathrm{i}}^2
(E) The holes are not generated due to the donors Choose the correct answer from the options given below :

Show answer and solution

Answer: (C) (A), (B), (E) only

(A) n type semiconductor holes are minority carriers and e−\mathrm{e}^{-}are majority carriers
(B) Dopant are pentavalent atom.

(C)
ne⋅nh=ni2\mathrm{n}_{\mathrm{e}} \cdot \mathrm{n}_{\mathrm{h}}=\mathrm{n}_{\mathrm{i}}^2 for intrinsic semiconductor
(E) In
nn type semiconductor primary source of holes generation are thermal excitation.

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