Lead-free oxidation-suppressed tin-based perovskite solar cells exhibit performance-improvement mechanisms

https://www.eurekalert.org/news-releases/1071996

"introducing large organic cations into tin perovskite crystals forming 2D layered Ruddlesden-Popper solar cells... hole/ electron transport layers surround perovskite crystal... when no light irradiated holes diffuse from hole transport layer, leading to energy barrier formation, suppressing electron backflow, improving performance... under sunlight irradiation, electrons moved to hole transport layer, attributable to high-energy electrons produced by UV, increasing energy barrier further improving efficiency"

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