Photons with energy lower than a semiconductor?s band gap aren?t readily absorbed by the material, so a
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Photons with energy lower than a semiconductor?s band gap aren?t readily absorbed by the material, so a measurement of absorption versus wavelength gives the band gap. An absorption spectrum for silicon shows no absorption for wavelengths longer than 1090 nm. Use this information to calculate the band gap in silicon, and verify its value in Table 37.1.
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Table 37.1 Band-Gap Energies for Selected Semiconductors (at 300 K) Semiconductor Band-Gap Energy (eV) Si 1.14 Ge 0.67 InAs 0.35 InP 1.35 GaP 2.26 GaAs 1.43 Cds 2.42 CdSe 1.74 ZnO 3.2 ZnS 3.6
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