Question

what is the drift current in solar cell

Answer 1

Simple explanation

Photons in sunlight hit the solar panel and are absorbed by semiconducting materials, such as silicon.
Electrons (negatively charged) are knocked loose from their atoms, allowing them to flow through the material to produce electricity. Due to the special composition of solar cells, the electrons are only allowed to move in a single direction.
An array of solar cells converts solar energy into a usable amount of direct current (DC) electricity.