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← ScienceWhich outcome occurs when thermal vibration reduces the band gap in a photodiode?
A)Dark current increases exponentially✓
B)Quantum efficiency remains unaffected
C)Reverse bias capacitance decreases
D)Breakdown voltage sharply increases
💡 Explanation
As temperature increases, lattice spacing changes via thermal expansion. This affects the energy bands, reducing the band gap energies via electron-phonon interaction. Because the band gap shrinks, more thermally generated carriers contribute to dark current; therefore dark current increases, rather than other electrical characteristics being notably affected.
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