This chapter provides a comprehensive overview of the key principles underlying PV technology, exploring the fundamental concepts of solar radiation, semiconductor physics, and the intricate mechanisms that facilitate the transformation of sunlight into a usable electrical power. This chapter provides a comprehensive overview of the key principles underlying PV technology, exploring the fundamental concepts of solar radiation, semiconductor physics, and the intricate mechanisms that facilitate the transformation of sunlight into a usable electrical power. Photovoltaic technology, often abbreviated as PV, represents a revolutionary method of harnessing solar energy and converting it into electricity. At its core, PV relies on the principle of the photovoltaic effect, where certain materials generate an electric current when exposed to sunlight. A single PV device is known as a cell. An individual PV cell is usually small, typically producing about 1 or 2 watts of power. Solar cells. All pv- modules contain a number of layers from the light-facing side to the back: Protection Layer: Usually made from glass, though in thin-film modules this can also be transparent plastic. Front Contact: The electric contact at the front, has to be transparent, as otherwise, light would not get. Solar energy is an endless and pure source of energy. Solar energy research is being used to help solve the world's energy dilemma, safeguard the environment, and promote significant sustainable economic growth. Humans have now constructed numerous solar photovoltaic power plants to produce.