We present a simple yet powerful analysis of Suns-photoluminescence quantum yield measurements that can be used to determine the surface saturation current densities of thin film semiconductors. We apply the method to state-of-the-art polycrystalline perovskite thin films of varying absorber thickness. We show that the non-radiative bimolecular recombination in these samples originates from the surfaces. To the best of our knowledge, this is the first study to demonstrate and quantify non-linear (bimolecular) surface recombination in perovskite thin films.

中文翻译：

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太阳光致发光量子产率测量的钙钛矿薄膜的表面饱和电流密度

我们对太阳光致发光量子产率测量进行了简单而强大的分析，可用于确定薄膜半导体的表面饱和电流密度。我们将该方法应用于不同吸收体厚度的最先进的多晶钙钛矿薄膜。我们证明这些样品中的非辐射双分子重组源自表面。据我们所知，这是第一项证明和量化钙钛矿薄膜中非线性（双分子）表面重组的研究。