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.

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