Q.
A: Materials of smaller band gap (‘Pbs’) not used for solar cell because radiation is absorbed by top layer of cell
B: In Ge and Si, the energy liberated due to hole electron recombination is mostly in the form of heat
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a
A, B are true
b
A, B are false
c
A is true, B is false
d
A is false, B is true
answer is A.
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Detailed Solution
Materials like PbS (where band gap is 0.4 eV) which have band gaps less than 1.5 eV - are not as frequently used in solar cells as Si, or GaAs, because in solar cells made of PbS, where incident photons' energy is a lot higher than the band gap, most of the photons incident are absorbed by the top layer of the cell and do not reach the junction (electron-hole separation, of course, needs to occur in the depletion region).
In Si and Ge due to their band gap recombination of hole and electron produce heat.

