When a photon enters the depletion zone of a p - n junction, the photon can scat

Question

When a photon enters the depletion zone of a p-n junction, the photon can scatter from the valence electrons there, transferring part of its energy to each electron, which then jumps to the conduction band. Thus, the photon creates electron-hole pairs. For this reason, the junctions are often used as light detectors, especially in the x-ray and gamma-ray regions of the electromagnetic spectrum. Suppose a single 690 keV photon transfers its energy to electrons in multiple scattering events inside a semiconductor with an energy gap of 0.60 eV, until all the energy is transferred. Assuming that each electron jumps the gap from the top of the valence band to the bottom of the conduction band, find the number of electron-hole pairs created by the photon.

Please type out the final answer

Explanation / Answer

number of E-H pairs are 690*10^3/0.6 = 1.15*10^6

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