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Perovskite films incorporating tin oxide (SnO<jats:sub>2<\/jats:sub>) as the electron transport layer face challenges in facet regulation. This study reveals that tea saponin (TS), a natural compound serves as a SnO<jats:sub>2<\/jats:sub> modifier, facilitates optimal growth of perovskite crystals on the (111) facet. The modification promotes preferential crystal orientation through hydrogen bond and Lewis coordination. TS forms a chelate with SnO<jats:sub>2<\/jats:sub>, resulting in a smoother film and n\u2010type doping, leading to improved carrier extraction and reduced defects. The TS\u2010modified perovskite solar cells achieve a champion efficiency of 24.2%, leveraging from an obvious enhancement of open\u2010circuit voltage (<jats:italic>V<\/jats:italic><jats:sub>oc<\/jats:sub>) of 1.18\u00a0V and fill factor (FF) of 82.8%. 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