Question

Space charge region around a p-n junction
1. does not contain mobile carriers
2. contains both free electrons and holes
3. contains one type of mobile carriers depending on the level of doping of the p or n regions
4. Contains electrons only as free carriers

Answer 1

Correct Answer - Option 1 : does not contain mobile carriers

PN Junction:

• The space charge region around the p-n junction is also known as the depletion region.
• The depletion layer is called as by the name, as it is depleted of mobile carriers.
• Space charge regions has fixed position of positive and negative space charge regions on either side of p-n junction i.e. on n and p side of junction respectively.
• These space charge regions are static, i.e. contain immobile carriers.

 

Thus space charge region around a p-n junction does not contain mobile carriers.