有机磷酸酯修饰FA0.8MA0.15Cs0.05Pb(I0.76Br0.24)3钙钛矿太阳能电池及其性能研究OA

The development of wide-bandgap perovskite solar cells is limited by the high defect density and severe non-radiative recombination within their films.This study proposes the use of 4-methoxyphenyldiethylphosphonate(DM)as a multifunctional additive to mitigate these problems.The P=O group in the DM molecule can form stable coordination bonds with under-coordinated Pb2+,effectively passivating defects.Simultaneously,its methoxy group regulates the local charge distribution through an electron-donating effect,thereby synergistically optimizing the crystallization process.Furthermore,the π-π stacking interactions between the benzene rings of DM molecules enhance the film's hydrophobicity,thereby improving environmental stability.The DM-modified wide-bandgap perovskite solar cell achieve a power conversion efficiency(PCE)of 22.08％.In contrast,the PCE of the control device without DM is only 18.89％.Furthermore,DM modification increase the open-circuit voltage(Voc)from 1.082 V to 1.127 V,the short-circuit current density(Jsc)from 22.33 mA·cm2 to 23.78 mA·cm2,and the fill factor(FF)from 78.17％to 82.39％.The unencapsulated DM-modified device retained 91.2％of its initial efficiency after 30 d of storage at 25℃ and 10％～40％relative humidity,significantly outperforming the control device(85.3％).These results strongly demonstrate the significant potential of DM as a functional additive for fabricating high-quality perovskite films and realizing high-performance devices,laying both experimental and theoretical foundations for its subsequent practical application.