Question
Question: Which of the following is true about the charge acquired by p – types semiconductors?...
Which of the following is true about the charge acquired by p – types semiconductors?
A
Positive
B
Neutral
C
Negative
D
Depends on concentrations of p impurity
Answer
Neutral
Explanation
Solution
p – type semiconductor is obtained when si or Ge is doped with a group 13 element like B, Al or Ga which contains only three valence electrons. An electrons hole is created at a place where the fourth valence electrons is missing. This electron hole moves like a positive charge towards cathode and conducts electricity. Thus, all p – types semiconductors are neutral.