51Poster Award NomineeP1-11Synthesis and Characterization of BaZrS3 Thin Films for Photovoltaic Applications Using a Stacked Elemental Layer Methodology Sumbal Jamshaid1,2, Peter J. Wellmann1, and Koichi Hayashi2 1 Crystal Growth Lab, Materials Department 6, University of Erlangen-Nürnberg, Erlangen, Germany 2 Department of Physical Science and Engineering, Nagoya Institute of Technology, Nagoya, Japan The demand for environmentally benign and efficient semiconductors for optoelectronic applications has led to the exploration of non-toxic perovskites, with chalcogenide perovskites emerging as a promising candidate due to their direct bandgaps and high absorption coefficients[1]. This study introduces a novel approach for synthesizing barium zirconium sulfide (BaZrS3) thin films, a chalcogenide perovskite, utilizing a stacked elemental layer methodology. This technique, inspired by methods used in chalcopyrite and kesterite fabrications, involves sputtering elemental Zr on silicon carbide (SiC) substrates, followed by electron beam evaporation of BaS, and culminates in a high-temperature sulfurization annealing process[2,3]. The resultant BaZrS3 thin films were characterized for their structural, optical, and surface properties through X-ray diffraction, UV-Visible spectroscopy, scanning electron microscopy, and energy-dispersive X-ray spectroscopy, revealing polycrystalline structures with an optimal band gap for photovoltaic applications. Comparative analysis of films synthesized on different substrates highlights the versatility and efficacy of this fabrication method, offering insights into substrate influence on film characteristics. [1] S. Niu, arXiv preprint, arXiv:1804.09362 (2018). [2] S. Jamshaid, Advanced Engineering Materials, 26(18), 2302161 (2024). [3] T. Freund, Crystals, 14(3), 267 (2024). P1-12Spin-dependent O2 Chemisorption and Catalytic CO Oxidation on Magnetized PtCo SurfaceMitsunori KurahashiCenter for Basic Research on Materials, National Institute for Materials Science (NIMS) The effects of electron spin on surface reactions are attracting attention since many technologically important catalytic reactions involve paramagnetic species and magnetic catalysts. Although spin-dependent chemical processes happening on magnetic atoms have been observed previously, how the magnetic atoms contained in alloy catalysts affect the catalytic activity of neighboring nonmagnetic atoms remains unclear. PtCo alloy has been investigated intensively for its application to fuel cell because it shows higher O2 reduction reaction efficiency than pure Pt. The Pt atoms in the PtCo alloy is expected to be slightly spin-polarized by neighboring Co, but how such induced spin polarization affects the catalytic activity of Pt is unknown. The present spin-resolved O2 chemisorption and CO oxidation experiments conducted with a spin-rotational state-selected O2 beam and a perpendicularly-magnetized Pt/Co(2ML)/Pt(111) film have indicated that the O2 chemisorption probability and the catalytic CO oxidation rate depend strongly on the spin orientation between O2 and the Pt surface. The magnitude of the spin orientation dependence was found to be greater than that observed for O2/Ni [1] even if the magnetic moment of Pt is much smaller than that of Ni. The SPMDS measurement and DFT calculation have indicated that surface Pt has a considerable spin polarization at around the Fermi level, which may cause the spin-dependent chemical activity of Pt/Co/Pt(111). [1] M. Kurahashi and Y. Yamauchi, Phys. Rev. Lett., 114, 016101 (2015).
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