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2 cards from this section. Quick, good the night before a test.
What is the purpose of doping a semiconductor?
Consider the role of impurities.
Name one example of a pentavalent element used for doping.
Think of elements from group 15.
What type of semiconductor has more electrons than holes?
Remember 'N' for Negative charge carriers.
True or False: P-type semiconductors have electrons as majority carriers.
Consider the role of trivalent dopants.
A silicon crystal is doped with 1 ppm of phosphorus. Calculate the number of free electrons and holes given that the intrinsic carrier concentration of silicon is 1.5 x 10^16 m^-3.
Consider the assumption on intrinsic carriers being much smaller than the dopants.
Explain how temperature variations could affect the performance of n-type and p-type semiconductors differently under varying thermal conditions.
Focus on the band gap and how thermal energy agitates the charge carriers.
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