• Incorporation of quantum dots (QDs) as crystallization seeds leads to larger perovskite crystals with reduced defect densities and preferential (001) and (002) orientations, significantly improving film morphology.
• QD-seeded films exhibit reduced non-radiative recombination and enhanced charge transport, as confirmed by steady-state and time-resolved photoluminescence, transient photovoltage measurements, and electrochemical impedance spectroscopy.
• Devices fabricated with QD-treated films achieve a remarkable power conversion efficiency (PCE) of 24.75% and exhibit exceptional long-term stability under simulated sunlight exposure, retaining 80% of their PCE after 1000 h of continuous illumination.
• This seed-mediated growth strategy offers a promising route to enhance both efficiency and stability in perovskite solar cells, addressing key challenges in crystallization and defect management.