Question

An optical pulse containing 6 × 10⁶ photons is incident on a photodiode and 4.5 × 10⁶ electron-hole pairs are created. The maximum possible quantum efficiency (in %) of the photodiode______.

Answer 1

Concept

The efficiency is defined as ratio of output to input.

In Quantum Efficiency

\(\eta = \frac{{No.\;of\;electron - hole\;pair\;generated}}{{No.\;of\;photons\;incident}}\) 

Calculation

\(\eta = \frac{{4.5 \times {{10}^6}}}{{6 \times {{10}^6}}}\) 

\(= \frac{{4.5}}{6}\) 

= 0.75

The maximum possible quantum efficiency is 75%