Question

Identify the one on which no external bias is applied.

(a) Zener diode

(b) Solar cell

(c) Photodiode

(d) Light-emitting diode

I 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 1

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.