摘要
Perovskite solar cells have attracted considerable attention due to their remarkable efficiency and potential for low-cost production.However,their performance is still impeded by defect states and non-radiative recombination.To mitigate this issue,pyromellitic diimide(PD)is employed as an additive to passivate bulk defects in perovskite materials,effectively inhibiting non-radiative recombination and minimizing energy loss within the system.Experimental investigations demonstrate that PD forms hydrogen bonds with formamidinium(FA^(+))ions and coordinates with Pb^(2+) ions,thereby effectively passivating defects.After being treated with PD,the perovskite film exhibits enhanced crystallinity and improved uniformity.As a result of suppressed non-radiative recombination,the solar cell achieves a high open-circuit voltage of 1.193 V along with a power conversion efficiency of 25.79%in 1.55 eV perovskite solar cells.Furthermore,the PDtreated unpackaged device shows improved stability,retaining 96% of its initial efficiency after 2000 h under a nitrogen atmosphere.This study offers valuable insights into developing effective passivation strategies that address defects in perovskite materials.
钙钛矿太阳电池凭借其卓越的性能表现与低成本应用潜力吸引了科研领域的广泛关注.然而,缺陷态和非辐射复合问题仍对其性能提升构成显著阻碍.为攻克这一难题,本研究引入均苯四甲酸二酰亚胺(PD)作为添加剂,用于钝化钙钛矿体相缺陷.实验结果表明, PD的加入能够与甲脒离子形成氢键,并与铅离子发生配位作用,进而实现高效的缺陷钝化,抑制了非辐射复合过程,从而将体系内的能量损失降至最低.经PD处理后,钙钛矿薄膜的结晶度显著提升,均匀性也得到明显改善.得益于非辐射复合的有效抑制,基于1.55 eV带隙的钙钛矿太阳能电池实现了1.193 V的高开路电压和25.79%的优异光电转换效率.此外, PD处理还显著增强了未封装器件的稳定性,在氮气环境下连续工作2000 h后,仍能保持初始效率的96%.本研究为开发高效的钝化策略以解决钙钛矿材料中的缺陷问题提供了有益参考.
基金
the financial support from the Key Research and Development Program of Ningxia (2025BEE02012)
the National Natural Science Foundation of China (52373169)
the Research Award Fund for First-class Discipline Construction (Education Discipline) in Higher Education Institutions of Ningxia,China (NXYLXK2021B10)
the Ningxia Key Laboratory of Green Catalytic Materials and Technology (2025SYSZD-08)。
