Question
The ratios of number density of free electron to holes, for two different materials A and B, are equal to one and less than one respectively. Name the type of semiconductors to which A and B belong. Draw energy level diagram for A and B.
Solution
For A :
ne/nh = 1.
This implies, ne = nh
A is an intrinsic semi-conductor.
For B:
ne/nh < 1.
This implies,
ne < nh.
Therefore,
B is p-type semi-conductor.
ne/nh = 1.
This implies, ne = nh
A is an intrinsic semi-conductor.
For B:
ne/nh < 1.
This implies,
ne < nh.
Therefore,
B is p-type semi-conductor.
