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प्रश्न
Explain the three processes involved in the working of a solar cell.
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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
Meeta's father was driving her to school. At the traffic signal, she noticed that each traffic light was made of many tiny lights instead of a single bulb. When Meeta asked this question to her father, he explained the reason for this.
Answer the following questions based on above information:
(i) What were the values displayed by Meeta and her father?
(ii) What answer did Meeta's father give?
(iii) What are the tiny lights in traffic signals called and how do these operate?
Describe briefly, with the help of a diagram, the role of the two important processes involved in the formation of a p-n junction.
What happens to the width of depletion player of a p-n junction when it is (i) forward biased, (ii) reverse biased?
Explain the formation of depletion layer and potential barrier in a p−n junction.
Explain how a potential barrier is developed in a p-n junction diode.
With reference to Semiconductor Physics,
Name the process that causes depletion region in a p-n junction.
Pressure P varies as P = `alpha/beta "exp" (- (alpha x)/"k"_"BT")`, where x denotes the distance, kB is the Boltzmann's constant, T is the absolute temperature and α and β are constant. The dimension of β is ______.
For LED's to emit light in visible region of electromagnetic light, it should have energy band gap in the range of:
How can a photodiode be used to measure light intensity?
What energy conversion takes place in a solar cell?
