The efficiency and stability of perovskite solar cells (PSCs) can be greatly affected by various factors such as passivating the perovskite film, oxidizing the hole-transport material of 2,2′,7,7′-tetras(N,N--methoxyaniline)-9,9′-spirodifluorene (Spiro-OMeTAD), and inhibiting the iodide migration. Here we introduce a multifunctional starch-iodine complex in the perovskite film to enhance the fill factor and stability of PSCs. Results demonstrate that the starch-iodine complex from the perovskite film can release iodine molecules to gently oxidize the Spiro-OMeTAD, which can significantly increase the PSC's fill factor. Moreover, the remaining starch can effectively passivate the perovskite film to obviously improve the PSC's long-term stability. Furthermore, the starch-iodine complex can absorb and store the iodide ions to generate a starch-triiodide complex, which can release iodide ions to promote iodide defect self-healing and suppress iodide migration in the perovskite films, resulting in a further enhancement of the PSC's long-term stability. As a result, the PSC based on the starch-iodine complex obtains a superior cell efficiency of 22.60% with a high fill factor of 79.54%, and keeps 91.12% of its original efficiency after 1500 h.

中文翻译：

---

淀粉-碘复合物多功能添加剂提高钙钛矿太阳能电池的填充因子和稳定性

钙钛矿太阳能电池（PSC）的效率和稳定性受到钙钛矿薄膜钝化、空穴传输材料2,2',7,7'-四(N,N-甲氧基苯胺)氧化等多种因素的影响。 )-9,9'-螺二芴 (Spiro-OMeTAD)，并抑制碘化物迁移。在这里，我们在钙钛矿薄膜中引入了多功能淀粉-碘复合物，以提高PSC的填充因子和稳定性。结果表明，钙钛矿薄膜中的淀粉-碘复合物可以释放碘分子，温和地氧化Spiro-OMeTAD，从而显着提高PSC的填充因子。此外，剩余的淀粉可以有效钝化钙钛矿薄膜，显着提高PSC的长期稳定性。此外，淀粉-碘络合物可以吸收和储存碘离子，生成淀粉-三碘化物络合物，该络合物可以释放碘离子，促进碘离子缺陷自修复并抑制碘离子在钙钛矿薄膜中的迁移，从而进一步增强钙钛矿薄膜的性能。 PSC的长期稳定性。结果，基于淀粉-碘复合物的PSC获得了22.60%的优异细胞效率和79.54%的高填充因子，并在1500小时后保持了91.12%的原始效率。