双功能添加剂策略制备高效钙钛矿太阳电池

Double-functional additive strategy for efficient perovskite solar cells

目前针对提高钙钛矿太阳能电池(PSCs)效率的研究发展迅速,效率已经达到26%.然而,在制备高效率PSCs时经常会使用过量PbI_(2),过量的PbI_(2)会导致电池的稳定性缺陷.为了解决这一问题,我们引入了阴阳离子共同作用的双功能添加剂苯乙胺三氟乙酸盐(PEATFA),来钝化钙钛矿薄膜中的缺陷和过量的PbI_(2),以协同钝化钙钛矿太阳能电池.PEA^(+)阳离子促进二维钙钛矿生成,而TFA^(-)阴离子钝化未配位的Pb_(2+)离子和碘空位,从而提高了钙钛矿晶体质量.此外,PEATFA的引入优化了钙钛矿与空穴传输层之间的能级匹配,从而提高了其电荷传输和抽取能力.最终,我们成功实现了PSCs 24.05%的光电转换效率,同时PSCs表现出最小的滞后现象和良好的稳定性.

Perovskite solar cells(PSCs)efficiency has recently achieved significant advancements,surpassing the 26%threshold.Excessive PbI_(2),often used in high-efficiency PSCs,will also cause stability or defect problems.To address these challenges,we introduce anionic and cationic bifunctional additives to passivate PSCs synergistically.Phenylethylamine trifluoroacetate(PEATFA)is utilized as an additive to passivate the perovskite film.The PEA^(+)cation facilitates the formation of two-dimensional perovskite while TFA−anion passivate the uncoordinated Pb^(2+)ions and iodine vacancies,enhancing perovskite crystal quality without excess PbI_(2).Furthermore,PEATFA modification optimizes the energy level matching between the perovskite and charge transfer layers,thereby enhancing charge transfer and extraction capabilities.Finally,the device achieves an impressive power conversion efficiency of 24.05%while exhibiting minimal hysteresis and good stability.