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← ScienceWhich outcome occurs when photons excite electrons beyond the band gap in semiconductors used for photodetectors?
A)Increased free carriers generation✓
B)Decreased material refractive index
C)Augmented electron-phonon scattering
D)Reduced electron tunneling probability
💡 Explanation
Increased free carrier generation occurs due to the increased energy absorbed through photon excitation above the band gap threshold. This promotes electron-hole separation via electron excitation, rather than causing immediate scattering events or directly affecting the refractive index, because the primary mechanism is photoelectric absorption.
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