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STD 12 - 14. Semicondutor electronics — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 12 - 14. Semicondutor electronics4 Marks
Question
A semiconductor $X$ is made by doping a germanium crystal with arsenic $(Z=33)$ . A second semiconductor $Y$ is made by doping germanium with indium $(Z=49)$. The two are joined end to end and connected to a battery as shown. Which of the following  statements is correct
✓

Answer

Arsenic has valence five and indium has valeance three. So $\mathrm{X}$ is $\mathrm{N}$$-type$ and $\mathrm{Y}$ is $p-type.$ As positive terminal of battery is connected to $N-type,$ and negative terminal to $p-type$ of $P-N$ junction, hence the junction is reverse biased.

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