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To convert silicon into an n-type semiconductor, it must be doped with an element having valency __________.

1. 2
2. 1
3. 3
4. 5

Correct answer: 5

Solution

Silicon is made n-type by doping with a group-15 element of valency 5 (P, As), which supplies extra electrons. A valency-1 dopant would not do this.

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