Herein we provide direct experimental evidence that proves that the photophysical properties of thin methylammonium lead iodide perovskite films are significantly enhanced by localized surface plasmon resonances (SPRs). Observations are well supported by rigorous calculations that prove that improved light harvesting can be unequivocally attributed to plasmonic scattering and near field reinforcement effects around silver nanoparticles embedded within the semiconductor layer. Adequate design of the localized SPR allows raising the absorptance of a 300 nm thick film at well-defined spectral regions while minimizing the parasitic absorption from the metallic inclusions. Measured enhancements can be as large as 80% at specific wavelengths and 20% when integrated over the whole range at which SPR occurs, in agreement with theoretical estimations. Simultaneously, the characteristic quenching effect that the vicinity of metals has on the photoluminescence of semiconductors is largely compensated for by the combined effect of the enhanced photoexcitation and the higher local density of photon states occurring at SPR frequencies, with a two fold increase of the perovskite photoemission efficiency being measured.

中文翻译：

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局部表面等离子体激元对嵌入金属纳米粒子的钙钛矿薄膜光物理的影响†

本文中，我们提供了直接的实验证据，证明了局部表面等离子体激元共振（SPR）显着增强了甲基铵碘化铅钙钛矿薄膜的光物理性质。严格的计算很好地支持了观察，这些计算证明，改善的光收集可以明确地归因于等离子体散射和嵌入半导体层内的银纳米颗粒周围的近场增强效应。局部SPR的适当设计允许在定义明确的光谱区域内提高300 nm厚膜的吸收率，同时最大程度地减少金属夹杂物的寄生吸收。与理论估计值一致，在特定波长下测得的增强幅度可高达80％，而在SPR发生的整个范围内进行积分时，测得的增强幅度可高达20％。