Q 12-14-156JEE MainJEE Main 2021 (26 Aug, Shift 1)Easy
**Statement I:** By doping silicon semiconductors with pentavalent material, the electrons density increases.
**Statement II:** The $n$-type of semiconductor has a net negative charge.
In the above statements, choose the most appropriate answer from the options given below:
Answer: (B) Statement I is true but Statement II is false.
Pentavalent (donor) atoms each give an extra free electron, so the electron density increases: Statement I is true.
Each donated electron leaves behind a positive donor ion, so the $n$-type crystal as a whole remains electrically neutral: Statement II is false.
Solution by Sreeraj P, M.Sc Physics