Controlling traps and structural defects in perovskite absorber layers is crucial for enhancing both the device efficiency and long-term stability of perovskite solar cells (PSCs). Here we demonstrate the modification of perovskite films by introducing low-cost green polymers, polysuccinimide (PSI) and polyasparagine (PASP), into the perovskite layer. Structural, morphological and optoelectronic properties of polymer-modified perovskite films were probed by scanning electron microscopy (SEM), X-ray diffraction (XRD), Fourier transform infrared (FTIR) and UV-Vis spectroscopy. The incorporation of PSI triggers interactions between the polymer and perovskite, leading to the passivation of surface defects at the grain boundaries and improved morphology of perovskite films. This defect passivation boosted PSC performance, providing power conversion efficiency (PCE) values up to 20.1%. An optimal polymer concentration of 0.1 mg/mL in the perovskite precursor solution was identified for an improvement in the photovoltaic performance. It was shown that the primary factor leading to the observed enhancement in the power conversion efficiency for PSI-modified PSCs is the increase in the lifetime of charge carriers due to the efficient passivation of surface defects and suppression of recombination losses. Additionally, PSI-modified PSCs demonstrated enhanced stability, retaining over 80% of their initial efficiency after 40 days of storage under ambient conditions without encapsulation. The obtained results highlight the effectiveness of green polymer additives in passivating surface defects in perovskite films and provide a viable approach for improving the stability and performance of perovskite solar cells.

The kinetics of the reaction of ozone with titanium dioxide is studied. The structure and optical characteristics of nanostructured thin layers of titanium dioxide (TiO₂) treated with an ozone-oxygen mixture with various ozone concentrations were studied by optical and infrared spectroscopy. It was shown that ozone treatment increases the adsorption of ruthenium dye (N719) in the bulk of the TiO₂ layer nano-structured. Ozone-treated TiO₂ layers were used as photoelectrodes for the design of sensitized solar cells (SCs). A study of the photovoltaic parameters of sensitized SCs under standard illumination (spectrum AM1.5G, illumination level 1000 W/m²) shows that modification of TiO₂ with ozone leads to an increase in the solar power conversion efficiency from 7.5 to 8.2%.

Nanopowders of complex oxides with the double perovskite structure La₂Ni_{1 – x}Fe_xMnO₆ (x = 0, 0.2, 0.4) were synthesized using the glycine-nitrate combustion method. Thin nanostructured layers based on the obtained materials were fabricated and studied by X-ray diffraction, scanning electron microscopy and UV-Vis optical spectroscopy. It was shown that introduction of Fe³⁺ ions into the La₂NiMnO₆ crystal structure at low concentration (x = 0.2) leads to an increase in the band gap value. To determine the photosensitivity of La₂Ni_{1 – x}Fe_xMnO₆ thin layers, Schottky diodes based on them were fabricated and their photovoltaic characteristics were studied in the dark and under standard AM1.5G illumination conditions. It has been found that cation doping with Fe³⁺ ions at low concentration increases the photosensitivity of La₂NiMnO₆ thin layer by ~7%. The presented results provide new possibilities for application of inorganic perovskite materials in solar photovoltaics.

A series of thin films made with TiO2nanoparticles with a varied anatase/rutile phase ratio is prepared on conducting glass substrates using a spin-coating method. The structure, morphology, and...