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What is the function of photodiode

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What is the function of photodiode

    • Posted by Rider Vivek 6 years, 11 months ago

    CBSE > Class 12 > Physics
    • 1 answers

    Yogita Ingle 6 years, 11 months ago

    • It is operated under reverse bias below the breakdown voltage
    • When photodiode is illuminated with light (photons) , with energy hט greater than the energy gap of the semiconductor, the electron-hole pairs are generated due to the absorption of photons, in or near the depletion region of the diode
    • Due to electric field at the junction, electrons and holes are separated before they combine
    • The direction of electric field is such that the electrons reach n-side and the holes reach the p-side
    • The movement of electrons and holes gives rise to emf
    • When external load is connected, current flows. The magnitude of the photocurrent depends on the intensity of incident light
    • In reverse bias, we can observe that as intensity increases, the current also increases

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