For silicon the conduction band minimum is located at 0.49 Å-1 in the [100] direction (X is the Brillouin zone at H00), while the valence band maximum is located at the Γ point (k = 0). a) What is the wavelength and energy of photons needed to supply the required momentum to excite an electron from the Γ point to the conduction band minimum? b) What is the wavelength of photons needed to supply the required energy to excite an electron from the Γ point to the conduction band minimum? c) What limits optical absorption in silicon at photon energies near the band gap?
For silicon the conduction band minimum is located at 0.49 Å-1 in the [100] direction (X is the Brillouin zone at H00), while the valence band maximum is located at the Γ point (k = 0). a) What is the wavelength and energy of photons needed to supply the required momentum to excite an electron from the Γ point to the conduction band minimum? b) What is the wavelength of photons needed to supply the required energy to excite an electron from the Γ point to the conduction band minimum? c) What limits optical absorption in silicon at photon energies near the band gap?
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For silicon the conduction band minimum is located at 0.49 Å-1 in the [100] direction (X is the Brillouin zone at H00), while the valence band maximum is located at the Γ point (k = 0).
a) What is the wavelength and energy of photons needed to supply the required momentum to excite an electron from the Γ point to the conduction band minimum?
b) What is the wavelength of photons needed to supply the required energy to excite an electron from the Γ point to the conduction band minimum?
c) What limits optical absorption in silicon at photon energies near the band gap?
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