Thickness-Dependent Optical Confinement in Glass/TiO₂/Perovskite (MAPbI₃) Thin Films: A Spectral Integration Approach
DOI:
https://doi.org/10.51699/cajotas.v7i2.1664Keywords:
Perovskite thin films, Transfer matrix method, Optical confinement, Multilayer structures, Spectral integrationAbstract
In this study, we proposed a theoretical investigation of the optical interaction of
multilayer thin films designed from glass/TiO2/MAPbI₃ using the Transfer Matrix Method (TMM)
in the range of 300–800 nm of visible light. The effect of TiO2 interlayer thickness (20 nm, 50 nm,
and 100 nm) on the confinement of interference light within a 400 nm-thick MAPbI₃ absorber layer
was analyzed. Our results showed that adding a layer of TiO₂ modifies the phase conditions within
the structure, leading to a redistribution of the optical field and a thickness-dependent absorption
behavior. We also used spectral integration to determine the overall effective absorption across the
visible light spectrum. We studied three layer thicknesses, but the 50 nm TiO₂ layer exhibited the
highest average absorption (0.259), representing an improvement of approximately 5.3% compared
to the 100 nm thickness. In the results obtained, we focused on the importance of improving the
thickness of the multiple layers in perovskite systems that are designed as a crystalline structure,
and cover important applications that work on developing the structure of thin-film photovoltaic
structures.
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