Questions
A p-n photodiode is fabricated from a semiconductor with a band gap of 2.5 eV. It can detect a signal of wavelength
a
6000 Ao
b
4000 nm
c
6000 nm
d
4000 Ao
detailed solution
Correct option is D
Only signals having wavelength less than threshold wavelength will be detected.Energy E=hv=hcλ⇒λ=hcESubstituting the values of h, c and E in the above equationλ=6.6×10-34×3×1082.5×1.6×10-19=5000 A0 As 4000 A0 < 5000 A0Talk to our academic expert!
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In a photodiode the conductivity increases when light of wavelength less than 620 nm is incident. The band gap is
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