Advertisements
Advertisements
प्रश्न
Explain the three processes involved in the working of a solar cell.
Advertisements
उत्तर
A solar cell is a junction of n-type silicon (blue) and p-type silicon (red).
It generates electricity by using sunlight to make electrons move across the junction between the different types of silicon:
- When sunlight shines on the cell, photons bombard the upper surface.
- The photons carry their energy from the n-type layer to the p-type layer through the p-n junction of the cell.
- The photons transfer their energy to electrons in the p-type layer.
- The electrons use this energy to move across the barrier into then-type layer and flow out into the circuit.
- This flow of electrons through the circuit gives rise to a flow of current in the external circuit.
संबंधित प्रश्न
Using the necessary circuit diagrams, show how the V-I characteristics of a p-n junction are obtained in
Reverse biasing
How are these characteristics made use of in rectification?
Carbon, silicon and germanium have four valence electrons each. These are characterised by valence and conduction bands separated by energy band gap respectively equal to (Eg)C, (Eg)Si and (Eg)Ge. Which of the following statements is true?
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.
Draw the circuit diagram of an illuminated photodiode in reverse bias. How is photodiode used to measure light intensity?
Draw the V-I characteristics of an LED. State two advantages of LED lamps over convertional incandescent lamps.
What is the magnitude of the potential barrier across a Ge p-n junction?
In Figure, assuming the diodes to be ideal ______.
How can a photodiode be used to measure light intensity?
