Physics (Essay) Paper 2 WASSCE (PC), 2021

Question 6

 

  1. What is a p-n junction?

  2. Differentiate between the production of a p-type semiconductor and the production of n-type semiconductor

 

 

Observation

 

Few candidatesattempted this question and got the correct response. Performance was below average.

The expected response

  1. A p-n junction
  2. Boundary/interface between a p-type and an n-type semiconductors joined together.

                                                                                                               

  3. Differentiating between the production of p-type semiconductor and n-type semiconductor

P-type semiconductor is produced by doping a pure semiconductor with trivalent atoms while n-type semiconductor is produced by  doping a pure semiconductor with pentavalent atom.