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Chapter 9: Problem 66

The Group 3 A/Group 5 A semiconductors are composed of equal amounts of atoms from Group \(3 \mathrm{A}\) and Group \(5 \mathrm{A}-\) for example, InP and GaAs. These types of semiconductors are used in light-emitting diodes and solid- state lasers. What would you add to make a p-type semiconductor from pure GaAs? How would you dope pure GaAs to make an n-type semiconductor?

Short Answer

Expert verified
To create a p-type semiconductor from pure GaAs, add Group 2A dopants such as Beryllium (Be), Magnesium (Mg), or Zinc (Zn). To make an n-type semiconductor, add Group 4A dopants like Silicon (Si), Germanium (Ge), or Tin (Sn).

Step by step solution

01

Identify the necessary dopants to create a p-type semiconductor

To create a p-type semiconductor, we need to add a dopant with one less valence electron than the Group 3A element. Gallium (Ga) is a Group 3A element, with 3 valence electrons. We need a dopant from Group 2A, with 2 valence electrons. Suitable dopants include elements such as Beryllium (Be), Magnesium (Mg), or Zinc (Zn).
02

Identify the necessary dopants to create an n-type semiconductor

To create an n-type semiconductor, we need to add a dopant with one extra valence electron than the Group 5A element. Arsenic (As) is a Group 5A element, with 5 valence electrons. We need a dopant from Group 4A, with 4 valence electrons. Suitable dopants include elements such as Silicon (Si), Germanium (Ge), or Tin (Sn). #Conclusion# To make a p-type semiconductor from pure GaAs, we can add Group 2A dopants such as Beryllium (Be), Magnesium (Mg), or Zinc (Zn). To make an n-type semiconductor, we can add Group 4A dopants such as Silicon (Si), Germanium (Ge), or Tin (Sn).

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