question_answer

  Classify each of the following as being either a p-type or an n-type semiconductor. Give reason. (a) doped with In.                                                                                                                                                      1 (b) doped with P.                                                                                                                                                       1

Answer:

                  (a) p-type because it has 3-valence electrons. Holes are produced which can move through the crystal like a                 (+)ve charge.                                                                                                                                                                     1 (b) n-type, because p-type has 5 valence electrons. The 5th electron becomes delocalised and is free to contribute to electrical conduction.                                                                                                                                                1