Response of Bilayer and Trilayer Graphene to High-Energy Heavy Ion Irradiation.

High-energy heavy ion irradiation is a very useful tool for the nanostructuring of 2D materials because defects can be introduced in a controlled way. This approach is especially attractive for the mass production of graphene nanomembranes when nanopore size and density can easily be tuned by ion irradiation parameters such as ion energy and applied fluence. Therefore, understanding the basic mechanisms in nanopore formation due to high-energy heavy ion impact is of the highest importance.

Simulation and Optimization of FAPbI Perovskite Solar Cells with a BaTiO Layer for Efficiency Enhancement.

Since the addition of BaTiO in perovskite solar cells (PSCs) provides a more energetically favorable transport route for electrons, resulting in more efficient charge separation and electron extraction, in this work we experimentally prepared such a PSC and used a modeling approach to point out which simulation parameters have an influence on PSC characteristics and how they can be improved. We added a layer of BaTiO onto the TiO electron transport layer and prepared a PSC, which had an FTO/TiO/BaTiO/FAPbI/spiro-OMeTAD/Au architecture with a power conversion efficiency () of 11%. Further, we used the simulation program SCAPS-1D to investigate and optimize the device parameters (thickness of the BaTiO and absorber layers, doping, and defect concentration) resulting in devices with s reaching up to 15%, and even up to 20% if we assume an ideal structure with no interlayer defects.

Simulating the Performance of a Formamidinium Based Mixed Cation Lead Halide Perovskite Solar Cell.

With the aim of decreasing the number of experiments to obtain a perovskite solar cell (PSC) with maximum theoretical efficiency, in this paper, PSC performance was studied using the program solar cell capacitance simulator (SCAPS-1D). The PSC with the architecture ITO/TiO/perovskite/spiro-MeOTAD/Au was investigated, while the selected perovskite was mixed cation RbCsFAPbI. The analysis was based on an experimentally prepared solar cell with a power conversion efficiency of ~7%.

Novel, Simple and Low-Cost Preparation of Ba-Modified TiO Nanotubes for Diclofenac Degradation under UV/Vis Radiation.

A novel low-cost synthesis of barium-modified TiO nanotube (TNT) arrays was used to obtain an immobilized photocatalyst for degradation of diclofenac. TNT arrays were prepared by electrochemical anodization of titanium thin films deposited on fluorine-doped tin oxide (FTO) coated glass by magnetron sputtering, ensuring transparency and immobilization of the nanotubes. The Ba-modifications were obtained by annealing solutions of Ba(OH) spin coated on top of TNT.

Formamidinium Lead Iodide Perovskite Films with Polyvinylpyrrolidone Additive for Active Layer in Perovskite Solar Cells, Enhanced Stability and Electrical Conductivity.

In this paper, we studied the influence of polyvinylpyrrolidone (PVP) as a stabilization additive on optical and electrical properties of perovskite formamidinium lead iodide (FAPI) polycrystalline thin films on ZnO nanorods (ZNR). FAPI (as an active layer) was deposited from a single solution on ZNR (low temperature processed electron transport layer) using a one-step method with the inclusion of an anti-solvent. The role of PVP in the formation of the active layer was investigated by scanning electron microscopy and contact angle measurements to observe the effect on morphology, while X-ray diffraction was used as a method to study the stability of the film in an ambient environment.