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← ScienceWhich phenomenon causes semiconductor conductivity to increase under illumination?
A)Photogeneration across the band gap✓
B)Increased phonon scattering rate
C)Creation of Cooper Pairs
D)Augmentation of impurity doping levels
💡 Explanation
The material’s conductivity increases because photogeneration across the band gap excites more electrons to the conduction band. This is photoconductivity rather than increased scattering rates, or changes in doping, therefore more carriers become available under illumination because of excitation.
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