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With which one of the following elements silicon should be doped so as to give p-type semiconductor?

1. Germanium
2. Arsenic
3. Selenium
4. Boron

Correct answer: Boron

Solution

To create a p-type semiconductor, silicon must be doped with an element that has fewer valence electrons than silicon (which has 4). Boron, with 3 valence electrons, creates holes, making it suitable for p-type doping.

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