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
If a small voltage is applied to a p-n junction diode, how will the barrier potential be affected when it is(ii) reveres biased?
Using the necessary circuit diagrams, show how the V-I characteristics of a p-n junction are obtained in
Forward biasing
How are these characteristics made use of in rectification?
A p-n photodiode is fabricated from a semiconductor with band gap of 2.8 eV. Can it detect a wavelength of 6000 nm?
Write briefly the important processes that occur during the formation of p−n junction. With the help of necessary diagrams, explain the term 'barrier potential'.
Draw the circuit diagram of a full wave rectifier using p-n junction diode.
Explain its working and show the output, input waveforms.
With reference to Semiconductor Physics,
Name the process that causes depletion region in a p-n junction.
For LED's to emit light in visible region of electromagnetic light, it should have energy band gap in the range of:
The amplifiers X, Y and Z are connected in series. If the voltage gains of X, Y and Z are 10, 20 and 30, respectively and the input signal is 1 mV peak value, then what is the output signal voltage (peak value)
- if dc supply voltage is 10V?
- if dc supply voltage is 5V?
The value of power dissipated across the Zener diode (Vz = 15 V) connected in the circuit as shown in the figure is x × 10–1 watt. The value of x, to the nearest integer, is ______.
Select the wrong statement in the case of LED.
