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CBSE Class 12-science Answered

In case of solar cells why is the p side (300 micro meters) so much more thicker than the n side (0.3 micro meter)? Also why an emf is generated in the case of solar cell. 
Asked by Anirudh | 19 Aug, 2017, 06:40: AM
answered-by-expert Expert Answer
A)
1) The difference in thickness can be theoretically related to the mobility, lifetime and diffusion lengths of minority carriers.
 
2) In a Si-based solar cell, the minority carriers on the p-side are electrons and on the n-side these are holes.
 
3) Since, the electrons have a higher mobility, lifetime and diffusion lengths than holes, the e-h pair generated in a thick p-layer after photon interactions will have a greater possibility of collection across the load terminals. This is the reason why p-side is thicker.
 
B)
A solar cell works when light is incident on the top surface of the cell. This light causes electron hole pair generation, plus the transfer of minority carriers through the p-n junction causes the build up of photovoltage. This is the emf generated by the cell.
Answered by Romal Bhansali | 21 Aug, 2017, 11:50: AM
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