The deep-level traps induced by charged defects at the grain boundaries (GBs) of polycrystalline organic–inorganic halide perovskite (OIHP) films serve as major recombination centres, which limit the device performance. Herein, we incorporate specially designed poly(3-aminothiophenol)-coated gold (Au@PAT) nanoparticles into the perovskite absorber, in order to examine the influence of plasmonic resonance on carrier dynamics in perovskite solar cells. Local changes in the photophysical properties of the OIHP films reveal that plasmon excitation could fill trap sites at the GB region through photo-brightening, whereas transient absorption spectroscopy and density functional theory calculations correlate this photo-brightening of trap states with plasmon-induced interfacial processes. As a result, the device achieved the best efficiency of 22.0% with robust operational stability. Our work provides unambiguous evidence for plasmon-induced trap occupation in OIHP and reveals that plasmonic nanostructures may be one type of efficient additives to overcome the recombination losses in perovskite solar cells and thin-film solar cells in general.

由多晶有机-无机卤化物钙钛矿（OIHP）薄膜晶界（GBs）处的带电缺陷引起的深能级陷阱作为主要的复合中心，限制了器件的性能。在此，我们将特别设计的聚（3-氨基苯硫酚）涂层金（Au@PAT）纳米颗粒掺入钙钛矿吸收体中，以研究等离子体共振对钙钛矿太阳能电池中载流子动力学的影响。OIHP 薄膜光物理性质的局部变化表明，等离子体激发可以通过光增亮填充 GB 区域的陷阱位点，而瞬态吸收光谱和密度泛函理论计算将这种陷阱态的光增亮与等离子体诱导的界面过程相关联. 结果，该设备达到了 22 的最佳效率。0% 具有强大的运行稳定性。我们的工作为OIHP中等离子体诱导的陷阱占据提供了明确的证据，并揭示等离子体纳米结构可能是一种有效的添加剂，可以克服钙钛矿太阳能电池和一般薄膜太阳能电池中的复合损失。