12th Class Physics Semiconducting Devices Question Bank Semiconducting Devices Conceptual Problems

  • question_answer
    Distinguish between the light emitting diode and the photodiode. Draw their biasing circuits.

    Answer:

           
    Light Emitting Diode LED) Photodiode
    1. It is forward biased. It is reverse biased.  
    2. Recombination of electrons and holes takes place at the junction and emits e. m. radiation. Energy (\[hv\]) is supplied by light to take an electron from valence band to conduction band.
               


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