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प्रश्न
How is a photodiode fabricated?
उत्तर
A photodiode is fabricated by allowing light to fall on a diode through a transparent window. It is fabricated such that the generation of e-h pairs take place near the depletion region.
संबंधित प्रश्न
Explain with the help of a diagram, how depletion region and potential barrier are formed in a junction diode.
The width of depletion region of p-n junction diode is _______.
(A) 0.5 nm to 1 nm
(B) 5 nm to 10 nm
(C) 50 nm to 500 nm
(D) 500 nm to 1000 nm
Briefly explain its working. Draw its V - I characteristics for two different intensities of illumination ?
Describe briefly, with the help of a diagram, the role of the two important processes involved in the formation of a p-n junction ?
The plate resistance of a triode is 8 kΩ and the transconductance is 2.5 millimho. (a) If the plate voltage is increased by 48 V and the grid voltage is kept constant, what will be the increase in the plate current? (b) With plate voltage kept constant at this increased value, by how much should the grid voltage be decreased in order to bring the plate current back to its initial value?
Explain how a potential barrier is developed in a p-n junction diode.
Draw the circuit arrangement for studying the V-I characteristics of a p-n junction diode in reverse bias. Plot the V-I characteristics in this case.
Draw the V-I characteristics of an LED. State two advantages of LED lamps over convertional incandescent lamps.
Write the important considerations which are to be taken into account while fabricating a p-n junction diode to be used as a Light Emitting Diode (LED). What should be the order of the band gap of an LED, if it is required to emit light in the visible range? Draw a circuit diagram and explain its action.
What energy conversion takes place in a solar cell?
