Substrates and Coating Layers
The optical constants of various substrates and coating materials employed widely for solar-cell fabrication are summarized. The substrate materials described here include various SiO2 (soda-lime glass, borosilicate glass, fused silica, and quartz), metal (stainless) and plastic (polycarbonate, PEN, PET, PMMA, Kapton HN) substrates. For PEN, PET and Kapton HN substrates, which exhibit strong biaxial optical anisotropy, full data sets are provided. In solar cell devices, a protection coating (EVA) and anti-reflection (MgF2/LiF) layers are quite important, and the optical constants of these coating layers are also described here. The refractive index spectra of the transparent materials were parameterized using the Sellmeier model, whereas the parameterization of absorbing polymer substrates was carried out assuming several transition peaks calculated by the Tauc-Lorentz model. In this chapter, the model parameters for all the substrates and coating materials are summarized, together with the tabulated optical constants.
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