Which outcome occurs when the work function of a semiconductor in a photodiode increases?

💡 Explanation

When the work function increases, the energy barrier for photoemission increases because a higher photon energy is now required to eject an electron, lessening the electron emission and reducing quantum efficiency, particularly near the threshold. Therefore quantum efficiency near the threshold results, rather than increased dark current, faster response time, or amplified reverse saturation requiring different physical factors.

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