3. On the next page is a typical, very broad light absorption spectrum for a sem

Question

3. On the next page is a typical, very broad light absorption spectrum for a semiconductor. Note that wavelength increases moving left to right across the x-axis. Refer to this spectrum to answer the following questions: (A) Which wavelength of light (A, B, or C) has an energy which matches the band gap energy of the semiconductor? (2 pts) (B) Which wavelength of light (A, B, or C) would be emitted when electrons in this semiconductor's conductance band fall to its valence band? (2 pts) Absorbance Wavelength, nm

Explanation / Answer

A) All absorptions are same in the given illustration, hence the band gap energy of the semi conductor is lesser in energy hence, the wave length C will have mathches the band gap energy of a semi conductor.

B) The direct gap of semi conductor indicates that the light emitted with wave length C as it is the less energy radiation.

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