A precise knowledge of the optical properties, specifically the refractive index, of organic/inorganic perovskites, is essential for pushing forward the performance of the current photovoltaic devices that are being developed from these materials. Here we show a robust method for determining the real and the imaginary part of the refractive index of MAPbBr₃ thin films and micrometer size single crystals with planar geometry. The simultaneous fit of both the optical transmittance and the photoluminescence spectra to theoretical models defines unambiguously the refractive index and the crystal thickness. Because the method relies on the optical resonance phenomenon occurring in these microstructures, it can be used to further develop optical microcavities from perovskites or from other optical materials.

中文翻译：

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有机/无机钙钛矿微晶的光学特性通过Fabry-Pérot共振的表征。

准确了解有机/无机钙钛矿的光学性质，特别是折射率，对于推动目前由这些材料开发的光伏器件的性能至关重要。在这里，我们展示了一种确定MAPbBr ₃薄膜和具有平面几何形状的微米级单晶折射率的实部和虚部的可靠方法。光学透射率和光致发光光谱对理论模型的同时拟合明确地定义了折射率和晶体厚度。由于该方法依赖于在这些微结构中发生的光学共振现象，因此可以用于从钙钛矿或其他光学材料进一步开发光学微腔。