Recent advancements in perovskite-type hybrid solar cells (PSCs) have driven significant interest due to their promising photovoltaic properties and potential to replace conventional silicon-based solar cells. In this work, we explore the use of N-[(3-dimethylamino) propyl] methacrylamide as an ionic additive in MAPbI3 PSCs with the structure fluorine-doped tin oxide/TiO2/perovskite/spiro-OMeTAD/Ag. This additive aims to enhance device stability by reducing surface defects and mitigating degradation under environmental conditions. Structural characterization through x-ray diffraction and x-ray photoelectron spectroscopy demonstrates that the incorporation of methacrylamide improves the moisture resistance and structural integrity of the perovskite layer. Devices containing the additive exhibit reduced formation of PbI2, even after prolonged exposure to ambient conditions, significantly enhancing stability. These findings underscore the role of ionic additive engineering in passivating defects and preserving photovoltaic performance. This work highlights a practical approach to improving the durability of perovskite solar cells, contributing to the advancement of stable and efficient next-generation photovoltaic technologies.

Lead-free titanium halide perovskites with the formula Cs2TiClxBr6−x were integrated into an ethylene–vinyl acetate (EVA) matrix to form hybrid perovskite thin films with tunable optoelectronic properties. Importantly, this work goes beyond compositional tuning by demonstrating that the polymer–perovskite hybrid architecture actively governs interfacial charge transport and polarization phenomena. Structural and optical characterization confirmed the formation of vacancy-ordered double perovskites with visible-light absorption and photoluminescence features associated with defect-mediated electronic relaxation. The electrical and photoinduced responses of the composites were investigated using electrochemical impedance spectroscopy with symmetric fluorine-doped tin oxide (FTO)│EVA│FTO configurations. Upon illumination, the films exhibited a marked decrease in impedance, revealing the halide-dependent modulation of charge transport, interfacial polarization, and pseudocapacitive behavior. Mixed-halide compositions displayed improved electrical uniformity and reduced transport resistance compared to pristine EVA, indicating enhanced photoinduced charge dynamics. Hirshfeld surface analysis was employed as a structural descriptor to quantify halide surface exposure, thereby linking composition-dependent electronic localization to the observed photoelectrical response. As a functional demonstration of these charge dynamics, the hybrid films were also evaluated under photocatalytic conditions, where light-driven formate and hydrogen generation corroborated the effective charge separation inferred from impedance measurements.