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← ScienceWhich mechanism causes decreased light absorption in doped semiconductors?
A)Burstein-Moss shift✓
B)Increased phonon scattering
C)Franz-Keldysh effect
D)Auger recombination enhancement
💡 Explanation
The Burstein-Moss shift decreases absorption because carrier concentration increases the Fermi level which then blocks transitions from the valence band. Therefore absorption decreases, rather than alternatives like increased scattering which involve other mechanisms.
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