Question 190: Semiconductors and Logic Gates

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 $$(eV)$$ for the semiconductor is

Accepted Answer

Band gap $$=$$ energy of photon of wavelength $$2480$$ $$nm.$$ So,
$$\Delta E = {{hc} \over \lambda }$$
$$ = \left( {{{6.63 	imes {{10}^{ - 34}} 	imes 3 	imes {{10}^8}} \over {2480 	imes {{10}^{ - 9}}}}} ight) 	imes {1 \over {1.6 	imes {{10}^{ - 19}}}}eV$$
$$ = 0.5\,eV$$

Answer

$$2.5$$ $$eV$$

Answer

$$1.1$$ $$eV$$

Answer

$$0.7$$ $$eV$$

Answer

$$0.5$$ $$eV$$

Semiconductors and Logic Gates

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

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