DOI: https://doi.org/10.29363/nanoge.emlem.2023.012
Publication date: 18th August 2023
Green energy and materials are crucial players in a world with growing energy demands. Elpasolites hold a double perovskite structure omitting toxic lead, gaining great interest[1]. Here Cs2Na1-xKxInCl6 compositions with Sb-doping are investigated. We explore the effect of Na-K alloy in different ratios on the structure and the electro-optic properties. We used a facile open-air colloidal synthesis for the Sb-doped Cs2Na1-xKxInCl6 nanoparticles, allowing easy access for examining different Na-K ratios.
The synthesis produces nanocubes of 15 nm in size. Replacing Na with K ions shifts the emission center wavelength to blue and increases the Stokes shift. Compared to the non-alloyed nanoparticles, a higher photoluminescence quantum yield is achieved for K-rich alloys with an optimum of ~35% at 80% K with respect to Na. This study is accompanied by high-resolution synchrotron X-ray diffraction of this Sb-doped and alloyed Cs2Na1-xKxInCl6 nanoparticles for structure validation and examination.
Using in-situ temperature-dependent X-ray diffraction and DFT calculations, we also address a previously understudied phase transition to a lower symmetry structure in the Cs2KInCl6 composition. The synthesized colloidal nanoparticles hold a cubic structure, whereas fused sub-micron particles and semi-bulk material have a tetragonal structure. We also show the dependence of the phase transition on the particle colloidal synthesis parameters.
Our results emphasize the significance of engineering phases and symmetry in double perovskites for enhanced optical activity toward environmentally friendly light-emitting materials with tunable optical properties.
This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement No 949682-ERC-HeteroPlates.
nanoGe is a prestigious brand of successful science conferences that are developed along the year in different areas of the world since 2009. Our worldwide conferences cover cutting-edge materials topics like perovskite solar cells, photovoltaics, optoelectronics, solar fuel conversion, surface science, catalysis and two-dimensional materials, among many others.
Previously nanoGe Spring Meeting (NSM) and nanoGe Fall Meeting (NFM), MATSUS is a multiple symposia conference focused on a broad set of topics of advanced materials preparation, their fundamental properties, and their applications, in fields such as renewable energy, photovoltaics, lighting, semiconductor quantum dots, 2-D materials synthesis, charge carriers dynamics, microscopy and spectroscopy semiconductors fundamentals, etc.
International Conference on Hybrid and Organic Photovoltaics
International Conference on Hybrid and Organic Photovoltaics (HOPV) is celebrated yearly in May. The main topics are the development, function and modeling of materials and devices for hybrid and organic solar cells. The field is now dominated by perovskite solar cells but also other hybrid technologies, as organic solar cells, quantum dot solar cells, and dye-sensitized solar cells and their integration into devices for photoelectrochemical solar fuel production.
Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics
The main topics of the Asia-Pacific International Conference on Perovskite, Organic Photovoltaics and Optoelectronics (IPEROP) are discussed every year in Asia-Pacific for gathering the recent advances in the fields of material preparation, modeling and fabrication of perovskite and hybrid and organic materials. Photovoltaic devices are analyzed from fundamental physics and materials properties to a broad set of applications. The conference also covers the developments of perovskite optoelectronics, including light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.
The International Conference on Perovskite Thin Film Photovoltaics Perovskite Photonics and Optoelectronics (NIPHO) is the best place to hear the latest developments in perovskite solar cells as well as on recent advances in the fields of perovskite light-emitting diodes, lasers, optical devices, nanophotonics, nonlinear optical properties, colloidal nanostructures, photophysics and light-matter coupling.