Explain briefly the three processes due to which generation of emf takes place in solar cell.

Explanation

Three processes due to which generation of emf takes place in a solar cell are:
Generation of electron-hole pairs due to light close to the junction.
(ii) Separation of electrons and holes due to electric field of the depletion region. Electrons are swept to n-side and holes to p-sides.
(iii) The electrons reaching the n-side are collected by the front contact and holes reaching p-side are collected by the back contact. Thus p-side becomes positve and n-side becomes negative giving rise to photovoltage.