The performance of kesterite solar cells is limited by the formation of secondary phases and defects during the growth of their photovoltaic absorbers. New research shows that a tailored partial pressure of selenium leads to less-defective kesterite without the formation of intermediate phases, enabling 13.8%-efficiency solar cells.
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The author declares no competing interests.
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Hao, X. Phase evolution under pressure. Nat Energy 8, 429–430 (2023). https://doi.org/10.1038/s41560-023-01261-4