Question

When light falls on a solar cell, the generation of emf happens due to

• A. generation of electron-hole pairs only
• B. generation and collection of electron-hole pairs only
• C. collection of electron-hole pairs only
• D. generation, separation and collection of electron-hole pairs
• E. separation and collection of electron-hole pairs

Answer 1

The Correct Option is D

In a solar cell, when light (photons) falls on the semiconductor material, it generates electron-hole pairs by exciting electrons in the material. These electron-hole pairs are then separated by the electric field present in the solar cell. The separation allows the electrons to move through the material, generating an electric current. Finally, the electrons and holes are collected at the respective electrodes, which generates the emf. Therefore, the process involves the generation, separation, and collection of electron-hole pairs.
Thus, the correct answer is that emf generation in a solar cell happens due to the generation, separation, and collection of electron-hole pairs.

The correct option is (D) : generation, separation and collection of electron-hole pairs

Answer 2

When light falls on a solar cell, photons with sufficient energy strike the p-n junction, resulting in the generation of electron-hole pairs. For an emf (electromotive force) to be developed, these pairs must then be:

• Generated by the incident photons 
• Separated by the electric field of the depletion region
• Collected by electrodes to produce current

✅ Correct Answer: generation, separation and collection of electron-hole pairs