question_answer 97)

  A perfect crystal of silicon (fig) is doped with some elements as given in the options. Which of these options shows n -type semiconductors?

Answer:

                  (a, c) N - type semiconductor When group 15 elements are doped into a perfect crystal it leads to formation of n-type semiconductor. Here, in (a) as (group 15, period 3) is doped to perfect' Si - crystal and in (c) as (group 15, period 2) is doped to perfect Si-crystal.