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← ScienceWhich outcome occurs when a semiconductor's crystal lattice experiences excessive tensile strain?
A)Band gap energy decreases significantly✓
B)Electron effective mass increases sharply
C)Debye temperature threshold gets higher
D)Density of phonon states becomes zero
💡 Explanation
A tensile force changes interatomic spacing, so band gap energy is modulated. Because crystal lattice deformation alters the electronic band structure – specifically the **deformation potential** mechanism – the band gap narrows. Therefore the band gap decreases, rather than electron mass rising or phonon changing, whose effects are less pronounced.
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