1：Experimental Design and Method Selection:

The thin films of H2TPyP were prepared using thermal evaporation technique. The crystal structure was studied using field emission scanning electron microscopy (FESEM) and X-ray diffraction (XRD). The optical features were examined using spectroscopic measurements of absorbance, transmittance, and reflectance within the spectral range of 200–2500 nm.

2：Sample Selection and Data Sources:

H2TPyP dye content 90% was purchased from Sigma-Aldrich Chemical Company and used without any purification.

3：List of Experimental Equipment and Materials:

High vacuum coating unit (Edwards Co. model E306A), quartz crystal monitor (INFICON SQM-160), double beam spectrophotometer (JASCO model V-570 UV–VIS–NIR), field emission scanning electron microscopy (FESEM, model FEI QUANTA 250 FEG), Philips X-ray diffraction system (model X/Pert Pro.).

4：Experimental Procedures and Operational Workflow:

The H2TPyP powder was evaporated using a quartz crucible heated slowly via a boat-shaped tungsten filament. The prepared thin films were grown on substrates with different thicknesses of 110, 205, and 300 nm with an average deposition rate of 0.4 nm/s.

5：4 nm/s. Data Analysis Methods:

5. Data Analysis Methods: The optical constants, dispersion parameters, and related optical variables were calculated from the measurements of absorbance, transmittance, and reflectance. The type of optical band transition and optical band gaps were interpreted using Tauc's equation.