Supplemental Materials

The Supplementary Material includes detailed photovoltaic parameters extracted from current density-voltage (J-V) curves for anatase (commercial), brookite (synthesized), and rutile (synthesized) TiO₂-based cells infiltrated at both 45% and 60% RH. It also contains capacitance-frequency plots from EIS measurements performed at VOC under different illumination intensities for devices fabricated at 45% and 60% RH, respectively. Additionally, it presents the EC model used to fit the impedance spectroscopy data and summarizes ideality factors calculated from impedance measurements for each TiO₂ phase.