Nanotechnology is revolutionizing solar cell technology, especially in photovoltaic (PV) and photovoltaic-thermal (PVT) systems. By manipulating materials on a nanoscale, researchers are developing more efficient solar cells capable of greater energy conversion and enhanced heat. Nanotechnology has arisen as a revolutionary technology, providing a diverse range of solutions to tackle energy-related difficulties. Nanotechnology refers to the branch of science and engineering devoted to designing, producing, and using structures, devices, and ystems by manipulating atoms and molecules at nanoscale. A variety of physical processes have been established at the nanoscale that can improve the processing and transmission of solar energy. The application of. Nanotechnology holds immense potential to enhance solar panel efficiency by 15% by 2025, through innovations like quantum dots and perovskite solar cells, improving light absorption and energy conversion while reducing material costs.