Question
A photodetector is made from a semiconductor In 0.53Ga0.47As with Eg = 0.73 eV. What is the maximum wavelength, which it can detect
Answer: Option B
:
B
Limiting value of hv is Eg, such that hv = hcλ = Eg
or λ=hcEg=6.63×10−34J−s×3×108ms−10.73×1.6×10−19J
= 1703 nm
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B
Limiting value of hv is Eg, such that hv = hcλ = Eg
or λ=hcEg=6.63×10−34J−s×3×108ms−10.73×1.6×10−19J
= 1703 nm
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