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High-efficiency solution-processed perovskite solar cells with millimeter-scale grains

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Science  30 Jan 2015:
Vol. 347, Issue 6221, pp. 522-525
DOI: 10.1126/science.aaa0472

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Large-crystal perovskite films

The performance of organic-inorganic hybrid perovskite planar solar cells has steadily improved. One outstanding issue is that grain boundaries and defects in polycrystalline films degrade their output. Now, two studies report the growth of millimeter-scale single crystals. Nie et al. grew continuous, pinhole-free, thin iodochloride films with a hot-casting technique and report device efficiencies of 18%. Shi et al. used antisolvent vapor-assisted crystallization to grow millimeter-scale bromide and iodide cubic crystals with charge-carrier diffusion lengths exceeding 10 mm.

Science, this issue p. 522, p. 519

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