Special Purpose Diodes
The material used for solar cell should have band gap
(A) equal to zero.
(B) equal to eV.
(C) between eV to eV.
(D) equal to eV.
Show answer and solution
Answer: (c)
- Most solar radiation has photon energy around eV.
- Too small a gap wastes energy as heat; too large a gap absorbs few photons.
- So the band gap should be between eV and eV, statement C.
- So the answer is (c) C.