OKINAWA, Japan, Aug. 21, 2017 — In just seven years of development, the efficiency of the perovskite solar cell has increased to the point where it rivals — and could soon overtake — the efficiency of the conventional photovoltaic cell. However, the perovskite structure continues to experience stability issues, causing these cells to degrade quickly and shortening their lifespans. This is a sample of a functioning perovskite-based LED light. Courtesy of OIST. 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