Gallium phosphide's measured optical absorption edge sits at

PHYSICS · Subjective · Fermi University Physics · Condensed Matter, Materials & Soft Matter · Semiconductor physics and devices · Dielectric and optical properties of solids

Condensed Matter Physics, Ch Electrons in a periodic potential: Bloch's theorem and the opening of a gap

Problem

Gallium phosphide's measured optical absorption edge sits at 549 nm549\ \mathrm{nm}. Find its band gap in electronvolts, and say whether a photon of wavelength 600 nm600\ \mathrm{nm} would pass through a thin gallium phosphide wafer or be absorbed by it.

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