First slide

Classification of semi-conductors

Question

The electrical conductivity of a semi conductor increases when electro magnetic radiation of wavelength shorter than 2480 nm is incident on it. The forbidden band gap for the semi conductor is

Moderate

A

0.9 eV
B

0.7 eV
C

0.5 eV
D

1.1 eV

Solution

When the energy of the incident photon is equal to or more than band gap energy conductivity of the semiconductor increases due to production of hole electron pair. here energy of the photon is $\frac{12400}{24800} = 0.5 e V$

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