First slide

Electrons and holes in semiconductors

Question

The electrical conductivity of a semiconductor increases when electromagnetic radiation of wavelength shorter than 2480 nm is incident on it. The band gap in eV.

Easy

Solution

$B a n d G a p = \frac{h c}{e V} = \frac{12400}{λ i n A^{0}} = \frac{12400}{24800} = 0.5 e V$

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