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Identify the one on which no external bias is applied.(a) Zener diode(b) Solar cell(c) Photodiode(d) Light-emitting diodeI have been asked this question in semester exam.My question is taken from Semiconductor Electronics topic in section Semiconductor Electronics : Materials, Devices and Simple Circuits of Physics – Class 12

Answer»

Correct answer is (b) Solar cell

To elaborate: Solar cells CONVERT solar energy into electric energy. A solar cell is a p-n junction that generates emf when solar radiation FALLS on the p-n junction. It works on the same principle as the photodiode, EXCEPT that no external bias is APPLIED and the junction area is kept large.



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