Porous titanium dioxide (TiO₂) films are essential components of dye sensitized solar cells (DSSCs) as well as perovskite solar cells (PSCs). Unfortunately, porosity, refractive index, and scattering properties of these films are only roughly known. This induces uncertainties in modelling and understanding of these solar cells. Since the literature provides only descriptions of the optical properties of the porous TiO₂ layers with unclear relevance to these solar cells, we investigate porous TiO₂ films really used in DSSCs and potentially usable in PSCs. The effective refractive index and the film porosity for different nanostructures that were fabricated from solution-based techniques were determined. The found values are 1.7982 ± 0.005 for the effective refractive index of one kind of TiO₂ films and 1.62 ± 0.002 for another one. These values lead to porosities of 53.5% and 65%, respectively. The scattering of the films can be described by a wavelength-independent effective scattering parameter for one film type and by effective scattering particles with a diameter of 46.5 nm for the other film type. The determined porosities are also of relevance for the ionic transport which is functionally crucial in DSSCs and a disturbance in PSCs.

多孔二氧化钛（TiO ₂）膜是染料敏化太阳能电池（DSSC）以及钙钛矿太阳能电池（PSC）的重要组成部分。不幸的是，这些膜的孔隙率，折射率和散射特性仅是大致已知的。这引起了对这些太阳能电池的建模和理解的不确定性。由于文献仅提供了与这些太阳能电池不清楚相关的多孔TiO ₂层的光学性质的描述，因此我们研究了多孔TiO ₂真正在DSSC中使用的电影，也可能在PSC中使用。确定了由基于溶液的技术制造的不同纳米结构的有效折射率和膜孔隙率。对于一种TiO ₂薄膜，有效值为1.7982±0.005，对于另一种TiO ₂薄膜为1.62±0.002。这些值导致孔隙率分别为53.5％和65％。膜的散射可以通过一种膜类型的与波长无关的有效散射参数来描述，而通过另一种膜类型的直径为46.5 nm的有效散射颗粒来描述。所确定的孔隙率也与离子迁移有关，离子迁移在DSSC中起着至关重要的作用，而在PSC中则具有干扰作用。