Question

The responsivity of an InGaAs photodiode for the quantum efficiency of 70% (energy gap of InGaAs is equal to
0.75 eV) is​

Answer 1

The responsivity of an InGaAs photodiode for the quantum efficiency of 70% is 0.933 A/W.

• According to Einstein energy Eg = hc/l;
• l = 6.6 x 10-34 (J-s) x 3x 108 (m/s) / 0.75 (ev) x 1.6 x 10-19
• l = 1664X 10-9 m
• So, the responsivity in terms of efficiency is defined by
• Ʀ = (h/1248) l
• Ʀ = (0.70/1248) 1664 x 10-9
• Ʀ =0.933 A/W

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