Method for bandgap interpolation of perovskite’s spectral complex refractive index

Y. Blom; M. R. Vogt; O. Isabella; R. Santbergen

doi:10.1117/12.3016766

18 June 2024 Method for bandgap interpolation of perovskite’s spectral complex refractive index

Y. Blom, M. R. Vogt, O. Isabella, R. Santbergen

Proceedings Volume 13014, Photonics for Solar Energy Systems X; 1301403 (2024) https://doi.org/10.1117/12.3016766
Event: SPIE Photonics Europe, 2024, Strasbourg, France

Abstract

Optimizing the bandgap energy for a perovskite cell typically requires the complex refractive index, which are obtained from spectroscopic ellipsometry measurements. While these measurements are usually available for a few discrete bandgap energies, it is desired to have them in continuous range to find the optimal bandgap energy. We propose a new method for generating the complex refractive index, based on the interpolation of a few measured data sets. The Forouhi-Bloomer model is used to fit the measured data. Then a linear regression is applied to the fit parameters with respect to the bandgap energy. From the interpolated parameters, the refractive index curve of perovskite with any desired bandgap energy is finally reconstructed. We validated our method by simulating the absorptance of a single junction perovskite cell and a perovskite/silicon tandem cell, showing that our method can accurately model the refractive index.

Conference Presentation

Citation Download Citation

Y. Blom, M. R. Vogt, O. Isabella, and R. Santbergen "Method for bandgap interpolation of perovskite’s spectral complex refractive index", Proc. SPIE 13014, Photonics for Solar Energy Systems X, 1301403 (18 June 2024); https://doi.org/10.1117/12.3016766

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