Conductivity of a photodiode starts changing only if the wavelength of incident light is less than 660 nm. The band gap of photodiode is found to be

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Solution

Q.
Conductivity of a photodiode starts changing only if the wavelength of incident light is less than 660 nm. The band gap of photodiode is found to be $(\frac{x}{8}) e V$ . The value of X is (Given, $h = 6.6 \times 10^{- 34} J s, e = 1.6 \times 10^{- 19} C$ ) [2024]

1 15

2 11

3 13

4 21

Ans.
(1)

$Energy bond gap E_{g} is$

$E_{g} = \frac{h c}{λ} = \frac{1240}{λ (in nm)}$

$= \frac{1240}{660} = 1.87 eV$

$or E_{g} = (\frac{15}{8}) eV$

$∴ x = 15$

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