DOI: https://doi.org/10.29363/nanoge.sus-mhp.2022.026
Publication date: 15th November 2022
Lead-free metal halide perovskites (LFP) have emerged as a promising family of semiconductors to develop a new green technology for optoelectronics. This manuscript demonstrates that Cs2SnI6 (a vacancy ordered double perovskite) nanocrystals (NCs) present an extraordinary self-defocusing response not yet observed up to now. The near field characterization of nanosecond pulses traversing the cuvette filled by a solution of NCs indicates that there is a certain threshold of excitation intensity from which the width of the beam experiences a fast growth with the formation of the rings. Furthermore, the dependence of the traversing beam with the intensity and concentration of nanocrystals in the solvent indicates four different regions where the beam broads, diffracts on concentric rings or saturates. This complex behavior is reproduced by a nonlinear beam propagation method (BPM) incorporating a particular nonlinearity based on two saturation Kerr effects not observed up to now. The associated refractive index change indicates (Δn) a giant self-defocusing response, Δn=-0.05, whose magnitude is tunned with the intensity and concentration. Moreover, under certain conditions Δn exhibits a crossover from self-defocusing to self-focusing with the propagation distance, leading to a self-induced waveguide. This crossover between low-to-giant negative Kerr effect is perfectly reversible and can be explained by a laser trapping of NCs that increases the effective concentration of NCs. The strong Kerr nonlinearity and this unexpected low-to-giant negative Kerr transition has never been observed and can be the base towards the optical signal processing fascinating opportunities in sensing and light–matter interactions for a future ecofriendly photonic technology.
This project has received funding from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 62656 (project DROP-IT) and by the Spanish MINECO through projects no. TEC2017-86102-C2-1-R and PID2020-120484RB-I00.
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.