A) protons
B) extra electrons
C) neutrons
D) missing electrons
Correct Answer: D
Solution :
Key Idea: Holes in a junction diode are produced due to thermal agitation of electrons in valence band In a junction diode, when electron jumps to conduction band from valence band due to thermal agitation or any other circumstances, then a vacancy is created in valence band which has positive charge equal to charge of electron in magnitude. This is called a hole. Thus, holes in junction diode are due to missing electrons. Note: The density of electrons in the conduction band of p-type is proportional to the Biltzmann factor.
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