- How Low Can Solar Cells Go? Perovskite Researchers Say Down, Down, Down. The cost of solar power is sinking practically by the day, and the next new “hot” solar cell material — perovskite — will push costs down even more. https://cleantechnica.com/2020/02/21/how-low-can-solar-cells-go-perovskite-researchers-say-down-down-down/ 10 comments energy