When light shines on a p-n junction diode, the current (I) vs, voltage $(\mathrm{V})$ is observed as in the figure below :
In which quadrant(s) does the diode generate power, so that it can be used as a solar cell?

• A

  Quad 1 only
• B

  Quad 1 and 3 only
• Correct answer
  C

  Quad 4 only
• D

  Quad 1 and 4 only

Solution

both i and $\mathrm{V}$ are of same sign

Hence, the correct answer is option: 'C'.