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If Ie and Ih are the electron and the hole current respectively for the intrinsic semiconductor, then the total current is equal to the:

If Ie and Ih are the electron and the hole current respectively for the intrinsic semiconductor, then the total current is equal to the: Correct Answer I<span style="position: relative; line-height: 0; vertical-align: baseline; bottom: -0.25em; font-size:10.5px;">e</span> + I<span style="position: relative; line-height: 0; vertical-align: baseline; bottom: -0.25em; font-size:10.5px;">h</span>

CONCEPT:

  • The material which is not a good conductor or a good insulator is called the semiconductor.
  • For example Silicon, Germanium, etc.

Two types of semiconductor:

  1. Intrinsic semiconductors:
    • ​​It is an undoped semiconductor or pure semiconductor without adding any impurity.
    • In intrinsic semiconductors, the number of free electrons, is equal to the number of holes.
    • The total current under the action of an electric field is given as,

⇒ I = Ie + Ih

Where Ie = electron current and Ih = hole current

  1. Non-intrinsic or extrinsic semiconductor: It is a semiconductor that is doped with a specific impurity that can deeply modify its electrical properties, making it suitable for electronic applications (diodes, transistors, etc.)
  • Depending upon the impurity added non-intrinsic semiconductors can be classified into P-type and N-type of semiconductors depending on whether the semiconductor is rich in holes or electrons.

EXPLANATION:

  • We know that in a semiconductor the total current is the sum of the electron current and the hole current.
  • Therefore if the Ie and Ih are the electrons and the hole current respectively for the intrinsic semiconductor, then the total current is given as,

⇒ I = Ie + Ih

  • Hence, option 3 is correct.

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