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25.See supplementary material at . In figure S1, structure formation upon DLIP is discussed. Figure S2 and S3 show the simulated electric fields for flat Sb2S3and P3HT:PCBM devices, respectively. In Figure S4, the obtained extinction plots are shown which correspond to Figure3(a). Futhermore, information concerning VASE ellipsometry, UV-VIS spectroscopy, sample preparation, and the Fresnel equations is provided.[Supplementary Material]
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Periodically structured electrodes are typically introduced to thin-film photovoltaics for the purpose of light management. Highly effective light-trapping and optimal in-coupling of light is crucial to enhance the overall device performance in such thin-film systems. Here, wavelength-scale structures are transferred via direct laser interference patterning to electron-selective TiO electrodes. Two representative thin-film solar cell architectures are deposited on top: an organic solar cell featuring blended P3HT:PCBM as active material, and a hybrid solar cell with SbS as inorganic active material. A direct correlation in the asymmetry in total absorption enhancement and in structure-induced light in-coupling is spectroscopically observed for the two systems. The structuring is shown to be beneficial for the total absorption enhancement if a high active material is deposited on TiO, but detrimental for a low material. The refractive indices of the employed materials are determined via spectroscopic ellipsometry. The study outlines that the macroscopic Fresnel equations can be used to investigate the spectroscopically observed asymmetry in light in-coupling at the nanostructured TiO active material interfaces by visualizing the difference in reflectivity caused by the asymmetry in refractive indices.


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