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Statement-I: By doping silicon semiconductor with pentavalent material, the electrons density increases. Statement-II: The n-type semiconductor has net negative charge. In the light of the above statements, choose the most appropriate answer from the statements from the options given below.

Asked in JEE Main 16th Aug 1st Shift 2021 · Doping and carrier concentration

• (1) Both statement I and statement II are false.
• (2) Statement I is true but statement II is false.
• (3) Statement I is false but statement II is true.
• (4) Both statement I and statement II are true.

Step-by-step solution

Why the other options are wrong

• (1) Pentavalent doping does raise the electron density, so Statement I is true.
• (3) Reverses both; the extra electrons are balanced by positive donor ions.
• (4) Forgets that each free electron leaves behind a positive donor ion, so the crystal stays neutral.

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