In this work, NaEuF4 nanoparticles (NPs) with high dispersity and uniformity were synthesized using a hydrothermal method and introduced into the TiO2 mesoporous layer of perovskite solar cells (PSCs) for testing as high efficiency, downconversion materials. NaEuF4 can convert high-energy photons into low-energy photons for absorption by CH3NH3PbI3 and generation of more electron–hole pairs; we tested the hypothesis that this would extend the sunlight absorption range and improve the photovoltaic performance of PSCs. When NaEuF4 NPs were incorporated into TiO2 mesoporous layers, PSCs achieved power conversion efficiencies of 14.51%, which were better than those of the control PSCs. The use of NaEuF4 NPs for improving PSC photovoltaic performance, as shown herein, could encourage the greater use of solar energy.

中文翻译：

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使用下转换 NaEuF4 纳米粒子在钙钛矿太阳能电池中取得的积极影响

在这项工作中，使用水热法合成了具有高分散性和均匀性的 NaEuF4 纳米粒子 (NPs)，并将其引入钙钛矿太阳能电池 (PSC) 的 TiO2 介孔层中，作为高效的下转换材料进行测试。NaEuF4 可以将高能光子转化为低能光子，供 CH3NH3PbI3 吸收，产生更多的电子-空穴对；我们测试了这样的假设，即这将扩大阳光吸收范围并提高 PSC 的光伏性能。当 NaEuF4 NPs 加入 TiO2 介孔层时，PSCs 实现了 14.51% 的功率转换效率，优于对照 PSCs。如本文所示，使用 NaEuF4 NP 来提高 PSC 光伏性能，可以鼓励更多地使用太阳能。