Q. 17

Why are elemental dopants for Silicon or Germanium usually chosen from group XIII or group XV?

Answer :

When a pure semiconductor is mixed with a small amount of impurities i.e. elements having number of valence electrons slightly different, the concentration of charge carries changes dramatically. So to increase the number of a particular type of charge carriers the Silicon and Germanium crystals that are elements of group XIV, are doped with a small amount of the elements of groups XIII or XV.

Rate this question :

How useful is this solution?
We strive to provide quality solutions. Please rate us to serve you better.
Try our Mini CourseMaster Important Topics in 7 DaysLearn from IITians, NITians, Doctors & Academic Experts
Dedicated counsellor for each student
24X7 Doubt Resolution
Daily Report Card
Detailed Performance Evaluation
view all courses

Hole is

Physics - Exemplar