Which of the following elements is used in the making of solar cells?

Silicon is the key element in most solar cells because it is a semiconductor that converts light into electricity.

Platinum is a costly catalyst metal, not the basis of ordinary solar cells.

Carbon is used in many materials but not as the main photovoltaic element here.

Silver appears only as thin conducting contacts, not as the light-absorbing material.

Doped silicon forms the junction that separates charges under sunlight.

Silicon is the second most abundant element in Earth's crust.