1. Why I-V characteristic curve of a solar cell is drawn in fourth quadrant
2. Advantages of LED’s over the conventional incandescent lamps.
3. What should be the order of band gap of an LED if it is required to emit light in the visible range?
4. name the charge carriers in n-type semiconductors.
5. important criteria for the selection of a material for solar cell fabrication/ why we use silicon or Gallium arsenide for making solar cell?
6. State the factor which which controls :(i) wavelength of light, (ii) intensity of light emitted by an LED.
7. Light emitting diode is
8. Why elemental semiconductors like Si and Ge cannot be used for making visible LED?
9. Write the working principle of solar cell
10. The three basic processes take place( in sequence) in a solar cell for generation of photovoltage.