Publication date: 15th May 2025
Coherent energy propagation promises scatter-free, phase-preserving transport as a remedy to the resistive losses and Joule heating limiting conventional semiconductor technology. Here, stroboscopic scattering microscopy reveals coherent quasiparticle propagation in Nb3Se10Cl2 and NbOI2, two distinct low-dimensional niobium-based materials. Nb3Se10Cl2 is a newly synthesized, one-dimensional van der Waals material composed of alternating linear and chiral chains. Optical characterization indicates an indirect-gap semiconductor with low-lying, long-lived excited states at low temperatures. Imaging of ultrafast carrier dynamics captures ballistic carrier transport reaching up to 590 km/s within the first 450 fs. This early-time propagation is attributed to the formation of coherent excitons by J-aggregation within Nb2Se6Cl2 subunits. Conversely, NbOI2 is a well documented, two-dimensional van der Waals ferroelectric material, predicted to host coherent oscillations of its ferroelectric order (ferrons). Following above-gap excitation, these narrow-band terahertz oscillations spread along the polar axis at velocities exceeding 100 km/s for hundreds of picoseconds. Despite their distinct dimensionalities, both systems illustrate the link between structural anisotropy and directional, coherent transport. These observations highlight the versatility of stroboscopic scattering microscopy in tracking coherent quasiparticle flow and thereby help inform the design and synthesis of low-dimensional systems for excitonic circuitry and THz emitters.
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.