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STD 12 - 14. Semicondutor electronics — NEET STD 11 Science — Question

Gujarat BoardEnglish MediumSTD 11 ScienceNEETSTD 12 - 14. Semicondutor electronics4 Marks
Question
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?
✓

Answer

$(a)$ 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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