Concept explainers
(a)
The concentration of majority carriers.
(a)
Answer to Problem 75AAP
The concentration of majority carriers is
Explanation of Solution
Write the expression to calculate the concentration of majority charge carriers in a n-type semiconductor.
Here, the concentration of majority carriers is
Conclusion:
Refer to the Figure-14.26 (“The effect of total ionized impurity concentration on the mobility of charge carriers in silicon at room temperature.”) to obtain the value of electron mobility as
Substitute
Thus, the concentration of majority carriers is
(b)
The ratio of arsenic to silicon atoms.
(b)
Answer to Problem 75AAP
Thus the ratio of arsenic to silicon atoms is
Explanation of Solution
Write the expression to calculate silicon atoms.
Here, the number of silicon atoms is
Write the expression for ratio arsenic to the silicon atoms.
Here, the number of arsenic atoms is
Conclusion:
Substitute
Substitute
Thus the ratio of arsenic to silicon atoms is
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Chapter 14 Solutions
Foundations of Materials Science and Engineering
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