3
QuizMultiple Choice

Transistors — Quiz

Question 3 • Physics

Which is a dopant for a p-type semiconductor?

Answer
A
antimony
B
arsenic
C
indium
D
phosphorus

Explanation

A p-type semiconductor is made by adding an impurity with fewer valence electrons than the semiconductor, creating holes that can carry charge. Silicon has four valence electrons, while indium has three, so indium is an acceptor dopant that produces p-type material. Antimony, arsenic, and phosphorus have five valence electrons and are commonly used as n-type dopants.

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