Answer:
Photovoltaic cell
Explanation:
The photovoltaic cell are designed to harvest sunlight and converts them into electricity by a process known as photoelectric effect. This process takes place in the semiconductor layer of the cell. Sunlight contains small bundles of energy molecules known as photons. When they fall on the semiconductor material, photon energy is transferred to the atoms of semiconductor material.
A German physicist "Heinrich Rudolf Hertz" discovered the photoelectric effect. Later on Albert Einstein also worked on it and got Nobel prize.
