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Semiconductor Electronics: Materials, Devices and Simple Circuits
Photodiode and Solar Cell
1 question from 1 paper, each with its answer.
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Concepts tested
- Photo emf and light intensity
All Questions
2004 AIPMT 1 question
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In a p–n junction photo cell, the value of the photo electromotive force produced by monochromatic light is proportional to: -In a p-n junction photocell, each absorbed photon (of energy greater than the band gap) creates an electron-hole pair near the junction.
The junction field separates these carriers: electrons go to the n-side and holes to the p-side, producing a photo emf and a photocurrent.
For monochromatic light of a fixed frequency, the number of electron-hole pairs produced per second is proportional to the number of photons falling per second, i.e. to the intensity of the light.
So the photo emf $\propto$ current through the cell, and the current $\propto$ intensity.
Hence the photo emf is proportional to the intensity of the light falling on the cell.