What type of semiconductor is formed when silicon is doped with arsenic? (2023)

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Question: What type of semiconductor is formed when silicon is doped with arsenic? (2023)

Options:

Correct Answer: n-type

Exam Year: 2023

Solution:

Doping silicon with arsenic, a pentavalent element, creates an n-type semiconductor due to the addition of extra electrons.

What type of semiconductor is formed when silicon is doped with arsenic? (2023)

What type of semiconductor is formed when silicon is doped with arsenic? (2023)

Step 1: Understand what doping means. Doping is the process of adding impurities to a semiconductor to change its electrical properties.
Step 2: Know what silicon is. Silicon is a common semiconductor material used in electronics.
Step 3: Identify arsenic. Arsenic is a chemical element that has five valence electrons, which means it can form five bonds with other atoms.
Step 4: Recognize the type of doping. When silicon (which has four valence electrons) is doped with arsenic (which has five valence electrons), the extra electron from arsenic is not needed for bonding.
Step 5: Determine the result of the doping. The extra electron from arsenic becomes free to move, which increases the number of negative charge carriers (electrons) in the silicon.
Step 6: Conclude the type of semiconductor. Because the doping process adds extra electrons, the resulting semiconductor is called an n-type semiconductor.

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