Solar cell, also called photovoltaic cell, is the minimum unit composing solar battery.
Photovoltaic power generation system uses solar photovoltaic module (also called solar panel) composed by numerous of small solar battery ("cell").

The key factor of solar battery is how much solar energy can be converted to electric energy (conversion efficiency).
Moreover, solar cell is produced by processing diffusion in solar wafer to form PN junction and to form electrode as an outlet of electricity.

Furthermore, there are various devices used to absorb sunlight effectively on surface of cell. Examples of such devices include a texture structure (fine pyramidal uneven shapes on crystal surface) which confines light effectively in electricity generation layer, and a antireflection film which prohibits injected sunlight from reflecting.