A solar cell is to be fabricated for efficien | vedclass

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Question

(A) For a solar cell,the material $A$ must be able to absorb a significant portion of the solar spectrum. The band gap energy of $A$ should be around

Vedclass · Accepted Answer

$E_{A}=1.5 \, eV, E_{B}=5 \, eV$

Vedclass · Answer

(A) For a solar cell,the material $A$ must be able to absorb a significant portion of the solar spectrum. The band gap energy of $A$ should be around $1.5 \, eV$ to efficiently convert solar radiation into electrical energy (emf).Material $B$ is used as a protective coating. To ensure that solar radiation passes through this coating without being absorbed,the band gap energy $E_{B}$ of material $B$ must be significantly larger than the energy of the incident photons. Therefore,a large band gap like $E_{B} = 5 \, eV$ is ideal for material $B$ to remain transparent to the solar spectrum.Thus,the optimum choice is $E_{A} = 1.5 \, eV$ and $E_{B} = 5 \, eV$.

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