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Question

In the diagram given ahead, which bulb out of B1 and B2 will glow and why ?

(b) Draw a diagram of an illumunated p-n junction solar cell.
(c) Explain briefly the three processes due to which generation of emf takes place in a solar cell.

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Solution

(a) B1 will glow because only diode D1 is forward biased.
(b)

(c)Three process due to which generation of emf takes place in a solar cell are :
(1) Generation, (2) Separation, (3) Collection.
(1) Generation : Generation of electron-hole pairs take place due to light.
(2) Separation : Separation of electron-hole pairs are due to electric field of depletion region.
(3) Collection : Electrons reach the n-side and are collected in front contact and holes are collected in the back contact.

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