The metal used in solar cells is

The correct option is A

Cesium

Explanation for correct option:

A. Cesium

Solar cell:

• “A solar cell is an electrical device that converts the energy of light directly into electricity with the help of the photovoltaic effect.”
• The metal that is highly used in solar cells is silicon as it shows the properties of a semiconductor.
• Cesium metal is also used in making solar cells due to its low ionization energy and it can easily convert sunlight into electrical energy.

Explanation for incorrect options:

Metals such as tin, gold, and sodium are not used in solar cells due to their high ionization energies also these metals do not hold the property of converting sunlight into electrical energy. Thus options B, C, and D are incorrect.

Hence, the correct option is A i.e. Cesium.