The latest solar panel technology in 2026 includes record-setting efficiency numbers, panels thinner than paper, and windows that generate electricity while you look through them. Efficiency Breakthrough: Perovskite-silicon tandem solar cells achieving 34. These innovations not only promise a cleaner, greener world but also reflect our resilience, creativity, and. The development of solar cell technology could be said to have begun when French physicist Alexandre Edmond Becquerellar first demonstrated the photovoltaic effect in 1839. From photovoltaic cells to solar thermal systems, these technologies vary in their working principles and uses.