The Japan Aerospace Exploration Agency (JAXA) has conducted a flight experiment with ultra-thin perovskite solar cells using a high-altitude balloon. Thin-film perovskite solar cells promise high efficiency and flexibility with low cost and weight. The 11-m (36-ft.)-dia. balloon was launched from the Taiki Aerospace Experiment Station on Hokkaido on Aug. 1 and climbed to an altitude of about 30 km (100,000 ft.) over the Pacific Ocean. The test specimen then descended by parachute into the ...

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