Three photodiodes d1 d2 d3 are made of semiconductors

Asked by admin @ in Physics viewed by 463 People

Three photo diodes D1, D2, D3 are made up of semiconductors having band gap of 2.5 eV, 2 eV and 3eV respectively. Ehich one will be able to detect light of wavelength 6000 A?

Answered by admin @


Max wavelength 1 = hc/E
= 6.6 x 10⁻³⁴ x 3 x 10⁸/ 2 x 1.6 x 10⁻¹⁹
= 6.18 x 10⁻⁷ m

max wavelength 2 = hc/E
= 6.6 x 10⁻³⁴ x 3 x 10⁸/ 2.5 x 1.6 x 10⁻¹⁹
= 3.96 x 10⁻⁷m

max wavelength 3 = hc/E
= 6.6 x 10⁻³⁴ x 3 x 10⁸/ 3 x 1.6 x 10⁻¹⁹
= 4.125 x 10⁻⁷m

as given A= 6 x 10⁻⁷m
The wave length on incident energy radiation must be greater for optical signals. which is true in case of D2

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