Semiconductor Electronics Materials Devices and Simple Circuits - Result Question 24

24. A p-n photodiode is made of a material with a band gap of 2.0eV. The minimum frequency of the radiation that can be absorbed by the material is nearly

(a) 10×1014Hz

(b) 5×1014Hz

(c) 1×1014Hz

(d) 20×1014Hz

[2008]

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Answer:

Correct Answer: 24. (b)

Solution:

(b) Eg=2.0eV=2×1.6×1019J

Eg=hv

v=Egh=2×1.6×1019J6.62×1034Js

=0.4833×1015s1=4.833×1014Hz5×1014Hz



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