a. Determine the maximum value of the energy gap that a semiconductor, used as a photoconductor, can have if it is to be sensitive to yellow light (600 nm). b. A photodetector whose area is 5 x 102 cm² is irradiated with yellow light whose intensity is 2 mW cm?. Assuming that each photon generates one electron-hole pair, calculate the number of pairs generated per second. c. From the known energy gap of the semiconductor GaAs (E, = 1.42 eV), calculate the primary wavelength of photons emitted from this crystal as a result of electron-hole recombination. d. Is the above wavelength visible? e. Will a silicon photodetector be sensitive to the radiation from a GaAs laser? Why?
a. Determine the maximum value of the energy gap that a semiconductor, used as a photoconductor, can have if it is to be sensitive to yellow light (600 nm). b. A photodetector whose area is 5 x 102 cm² is irradiated with yellow light whose intensity is 2 mW cm?. Assuming that each photon generates one electron-hole pair, calculate the number of pairs generated per second. c. From the known energy gap of the semiconductor GaAs (E, = 1.42 eV), calculate the primary wavelength of photons emitted from this crystal as a result of electron-hole recombination. d. Is the above wavelength visible? e. Will a silicon photodetector be sensitive to the radiation from a GaAs laser? Why?
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4. Band gap and photodetection:
Transcribed Image Text:a. Determine the maximum value of the energy gap that a semiconductor, used as a photoconductor,
can have if it is to be sensitive to yellow light (600 nm).
b. A photodetector whose area is 5 x 102 cm² is irradiated with yellow light whose intensity is 2 mW
cm?. Assuming that each photon generates one electron-hole pair, calculate the number of pairs
generated per second.
c.
From the known energy gap of the semiconductor GaAs (E, = 1.42 eV), calculate the primary
wavelength of photons emitted from this crystal as a result of electron-hole recombination.
d. Is the above wavelength visible?
e. Will a silicon photodetector be sensitive to the radiation from a GaAs laser? Why?
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