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Perovskite photovoltaics

Reactions at the grain surface

The performance of perovskite solar cells with mesoscopic carbon electrodes is limited by inefficient charge transport and charge accumulation at interfaces. Now, by reacting hexamethylene diisocyanate with organic cations at the surface of perovskite grains and passivating defects, 23.2% efficiency can be achieved in small-area devices.

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Fig. 1: Representation of HDI and FAHDI interactions with different grain boundaries.

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Correspondence to Carys Worsley.

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Worsley, C. Reactions at the grain surface. Nat Energy 10, 1050–1051 (2025). https://doi.org/10.1038/s41560-025-01819-4

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