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NEET 2021
Exam
NEET
Year
2021
Subject
Physics
Chapter
Semiconductors

NEET 2021 · Physics · Semiconductors

The electron concentration in an undefined n -type semiconductor is...

The electron concentration in an undefined nn-type semiconductor is the same as hole concentration in a undefined pp-type semiconductor. An external field (electric) is applied across each of them. Compare the currents in them.

Options

  1. Acurrent in n−n -type = current in p−p - type
  2. Bcurrent in n−n - type << current in p−p - type.
  3. Ccurrent in n−n - type >> current in p−p - type.
  4. DNo current will flow in p−p -type, current will only flow in n−n -type.

Correct answer

C. current in n−n - type >> current in p−p - type.

Step-by-step solution

Electron's effective mass is smaller than holes therefore mobility of electrons is higher than holes and for equal electric field drift velocity of the electron will be greater compared to holes.

I=neAvdI=neA\muEI = neA{v}_{d}I = neA\muE

∵μe>μholeso,(vd)e>(vd)hole∴Ie>Ihole∵ {\mu}_{e} > {\mu}_{hole}so, {\left({v}_{d}\right)}_{e} > {\left({v}_{d}\right)}_{hole} ∴ {I}_{e} > {I}_{hole}

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