Explain the process of making solar cell panel . 

There are two types of semiconductors n-type and p-type.

When this n and p-type semiconductor are joint together they formed a structure for the solar panel.

Further, it can be coated with anti-reflection glass layer to trap sunlight inside it.

When sunlight falls on it there is a flow of electron from n-type to the p-type semiconductor which is responsible to the generation of electric current.