A solar cell is to be fabricated for efficient conversion of sola… - Vidyadip

MCQ

A solar cell is to be fabricated for efficient conversion of solar radiation to emf using material $A$. The solar cell is to be mechanically protected with the help of a coating using material $B$. If the band gap energy of materials $A$ and $B$ are $E_{A}$ and $E_{B}$ respectively, then which of the following choices is optimum for better performance of the solar cell?

✓
$E_{A}=1.5 \,eV , E_{B}=5 \,eV$
B
$E_{A}=1.5 \,eV , E_{B}=1.5 \,eV$
C
$E_{A}=3 \,eV , E_{B}=1.5 \,eV$
D
$E_{A}=0.5 \,eV , E_{B}=5 \,eV$

✓

Answer

Correct option: A.

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

a
$(a)$ For solar cell, we want the electrons to cross the energy gap of material $A$, which is close to $1.5 eV$. As, no emission of photon takes place in $B$ since it is only used for covering. So, its band gap must be large, i.e. $E_{B}=5 \,eV$.

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