In this work, we report a reliable method for synthesizing (Au, Au/Ag core)/(TiO₂ shell) nanostructures with their plasmonic wavelengths covering the visible light region for perovskite solar cells. The mono- and bi-metallic core-shell nanoparticles exhibit tunable localized surface plasmon resonance wavelength and function as “light tentacle” to improve the photo-electricity conversion efficiency. Plasmonic nanoparticles with different sizes and shapes, different thicknesses of TiO₂ shell and Ag interlayer are found to have a strong influence on the localized surface plasmon resonance enhancement effect. The experimental photovoltaic performance of perovskite solar cells is significantly enhanced when the plasmonic nanoparticles are embedded inmesoporous TiO₂ scaffolds. A champion photo-electricity conversion efficiency of 17.85% is achieved with nanoparticles (Au/Ag, λ_LSPR = 650 nm), giving a 18.7% enhancement over that of the pristine device (15.04%). Finite-difference time-domain simulations show that nanorod Au in mesoporus TiO₂ scaffold induces the most intense electromagnetic coupling, and provides a novel emitter for photon flux in mesoporous perovskite solar cells. These theoretical results are consistent with the corresponding experimental those. Thus, enhancing the incident light intensities around 650 nm will be most favorable to the improvement of the photo-electricity conversion efficiency of perovskite solar cells.

在这项工作中，我们报告了一种可靠的方法，用于合成（Au，Au / Ag核）/（TiO ₂壳）纳米结构，其等离子体波长覆盖钙钛矿型太阳能电池的可见光区域。单金属和双金属核-壳纳米粒子表现出可调节的局部表面等离子体共振波长，并充当“触手”以提高光电转换效率。发现具有不同尺寸和形状，不同厚度的TiO ₂壳层和Ag中间层的等离子纳米颗粒对局部表面等离振子共振增强效应有很强的影响。当等离子纳米粒子嵌入介孔TiO _2中时，钙钛矿太阳能电池的实验光伏性能得到显着提高。脚手架。纳米粒子（Au / Ag，_λLSPR  = 650 nm）可实现17.85％的最佳光电转换效率，比原始器件（15.04％）提高了18.7％。时域有限差分模拟表明，介孔TiO ₂支架中的纳米棒Au诱导了最强的电磁耦合，并为介孔钙钛矿太阳能电池中的光子通量提供了新型发射极。这些理论结果与相应的实验结果相吻合。因此，增强650nm附近的入射光强度将最有利于钙钛矿太阳能电池的光电转换效率的提高。