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Chapter 12: Problem 15

If you want to dope GaAs to make an n-type semiconductor with an element to replace Ga, which element(s) would you pick?

Short Answer

Expert verified
To make an n-type semiconductor by doping GaAs, we can replace Ga with elements from Group 14 (carbon group) such as Si (Silicon) or Ge (Germanium) since they have 4 valence electrons, which is just one more than Ga's 3 valence electrons. Out of the Group 14 elements, Si and Ge are suitable choices due to their similar properties and common use in doping semiconductors.

Step by step solution

01

Identify the valence electron count of Ga

Ga or Gallium is in Group 13 of the periodic table, which means it has 3 valence electrons.
02

Find elements with one more valence electron

We're looking for elements in the periodic table that have 4 valence electrons, as they have one more valence electron than Ga. They would be in Group 14, also known as the carbon group. Some elements in this group include C (Carbon), Si (Silicon), Ge (Germanium), Sn (Tin), and Pb (Lead).
03

Determine a suitable candidate for doping

Considering the properties and availability of these elements, we can narrow down the options. C might not be a suitable choice due to its tendency to form insulating compounds. Si and Ge are commonly used for doping and have similar properties to Ga, making them good candidates.
04

Result

In this case, suitable elements to replace Ga for making an n-type semiconductor are Si (Silicon) and Ge (Germanium).

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