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. Solar panels harness sunlight through the photovoltaic effect, converting solar energy into clean, renewable electricity for a sustainable future. Pixabay, andreas160578 Solar panels play a crucial role in harnessing renewable energy by converting sunlight into usable electricity. Understanding how. Neither the United States nor the United States Department of Energy, nor any of their employees, nor any of their contractors, subcontractors, or their employees, makes any warranty, expressed or implied, or assumes any legal liability or responsibility for the accuracy, completeness or usefulness. 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. Solar Cell Definition: A solar cell (also known as a photovoltaic cell) is an electrical device that transforms light energy directly into electrical energy using the photovoltaic effect.