Researchers demonstrate perovskite films with certified 25.9% solar efficiency
Image: Primary Researchers led by Sungkyunkwan University demonstrated perovskite solar cells with certified power conversion efficiency of 25.9% using a crystal-growth process that reduces defects. Their study, published in Science, also demonstrated an LED with external quantum efficiency of 26.1% using the same device architecture.
Heating a mixture of methylammonium chloride and a zinc halide to around 100°C creates a liquid layer at crystal boundaries, helping small grains merge. The chloride subsequently evaporates, while remaining zinc helps suppress defects. The films reached a charge-carrier lifetime of approximately 295 μs. The results demonstrate device performance in research, with the researchers describing commercialization as a future application.
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