(a) Determine the maximum value of the energy gap which a semiconductor, used as a photodetector, can have if it is to be sensitive to light of wavelength λ0 = 0.600μm. (b) A photodetector whose area...

(a) Determine the maximum value of the energy gap which a semiconductor,

used as a photodetector, can have if it is to be sensitive to light of wavelength λ0 = 0.600μm.

(b) A photodetector whose area is 5 × 10−6 m2 is irradiated with light whose

wavelength is λ0 = 0.600μm and intensity is 20 W/m2. Assuming each

photon generates one electron-hole pair, calculated the number of pairs

generated per second.

(c) By what factor does the answer to (b) change if the intensity is reduced by

a factor of 1/2?

(d) By what factor does the answer to (b) change if the wavelength is reduced

by a factor of 1/2?