Question

Let R denote the responsivity of a PIN photodetector and \(\lambda\) is the wavelength. Figure of merit for the photo detector is quantum efficiency. The expression for quantum efficiency \(\mu\) is given by

• A. \(\mu = \frac{12.4R}{\lambda}\)
• B. \(\mu = \frac{12400R}{\lambda}\)
• C. \(\mu = \frac{1.24R}{\lambda}\)
• D. \(\mu = \frac{0.124R}{\lambda}\)

Hint:

In photodetectors, quantum efficiency is directly related to the responsivity and wavelength. Remember the formula \( \mu = \frac{1.24R}{\lambda} \) for calculating quantum efficiency.

Answer 1

The Correct Option is C

The quantum efficiency \( \mu \) of a photodetector is defined as the ratio of the number of charge carriers collected to the number of incident photons. The expression for quantum efficiency is: \[ \mu = \frac{1.24R}{\lambda} \] where \( R \) is the responsivity and \( \lambda \) is the wavelength. This formula connects the quantum efficiency to the responsivity and wavelength. Therefore, the correct answer is option (3).