UNIFIED OPTICAL DISPERSION MODELLING OF PEROVSKITE SOLAR CELLS
DOI:
https://doi.org/10.60787/tnamp.v25.715Keywords:
Perovskite solar cells, Refractive index dispersion, Extinction coefficient, Sellmeier model, Thermo-optic effects, Lorentz oscillator modelAbstract
This work presents a unified optical dispersion framework for perovskite solar cell materials that incorporates wavelength- and temperature- dependent effects. The refractive index was modeled using a two-oscillator Sellmeier equation combined with a thermo-optic polynomial to describe variations with photon energy and temperature. Optical absorption was represented using the Lorentz damped harmonic oscillator model, providing a physically consistent description of extinction spectra. Validation against experimental data spanning 298.15–348.15 K and band gaps of 1.58–1.77 eV showed excellent agreement. The Sellmeier model achieved near-perfect fits (R2 ≈ 0.99999), the thermo-optic extension provided unified predictions (R2 ≈ 0.866), and the Lorentz model reproduced extinction behavior with R2 values up to 0.99. The results demonstrate strong coupling between thermal effects, electronic transitions, and optical dispersion. This framework bridges material characterization and device-level simulation, enabling improved prediction of perovskite solar cell performance, thermal stability, and energy yield under realistic operating conditions.
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