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  • A photodiode is made of a material with a band gap of <img alt="\mathrm{2.0 \mathrm{eV}}" src="ht

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

Option: 1

10 \times 10^{14} \mathrm{~Hz}
 


Option: 2

5 \times 10^{14} \mathrm{~Hz}
 


Option: 3

1 \times 10^{14} \mathrm{~Hz}
 


Option: 4

20 \times 10^{14} \mathrm{~Hz}


Answers (1)

best_answer

\mathrm{p-n} photodiode is a semiconductor diode that produces a significant current when illuminated. It is reversed biased but is operated below the breakdown voltage.

\mathrm{\text{Energy of radiation = band gap energy}}

\mathrm{\text { i.e., } h \mathrm{v} =2.0 \mathrm{eV} }

\mathrm{\text { or } \mathrm{v} =\frac{2.0 \times 1.6 \times 10^{-19}}{6.6 \times 10^{-34}} \approx 5 \times 10^{14} \mathrm{~Hz} }

Hence option 2 is correct.


 

Posted by

Divya Prakash Singh

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