Since then, the efficiency of PV cells has steadily increased. In the 1970s, the efficiency rate improved to around 10%, and by the late 1990s, the best commercial cells were achieving efficiencies of over 15%. The ongoing pursuit of higher efficiencies has led to the emergence of various types of solar cells, including monocrystalline, polycrystalline, and thin-film technologies. Each type has its own advantages and applications, allowing for a wider range of implementations in residential, commercial, and utility-scale solar projects.
