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NEET
Exam
NEET
Subject
Physics
Chapter
Semiconductors

NEET · Physics · Semiconductors

Statement I: By doping silicon semiconductors with pentavalent...

Statement I: By doping silicon semiconductors with pentavalent material, the electrons density increases.

Statement II: The n−n -type of semiconductor has a net negative charge.

In the above statements, choose the most appropriate answer from the options given below:

Options

  1. ABoth Statement I and Statement II are false.
  2. BStatement I is true but Statement II is false.
  3. CStatement I is false but Statement II is true.
  4. DBoth Statement I and Statement II are true.

Correct answer

B. Statement I is true but Statement II is false.

Step-by-step solution

Pentavalent material has excess free e−{e}^{-} because we mix the impurities like phosphorus and arsenic having five electrons in the outermost shell. So e−{e}^{-}density increases, but overall semiconductor is neutral. So we can say that Statement I is true but, Statement II is false.
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