Question
Physics Question on P-N Junction
Suitable impurities are added to a semiconductor depending on its use. This is done to
A
increase its life
B
enable it to withstand high voltage
C
increase its electrical conductivity
D
increase its electrical resistivity
Answer
increase its electrical conductivity
Explanation
Solution
When pure semiconductor material is mixed with small amount of certain specific impurities with valency different from that of the parent material, the number of mobile electrons / holes drastically increases; hence increasing its electrical conductivity.