Publication date: 28th August 2024
Metal halide perovskites have attracted much attention for use in several optoelectronic applications, including photovoltaics and light emission. Due to their superior stability and bright photoluminescence, quasi-2D or layered perovskites such as the Ruddlesden-Popper perovskite phenylethylammonium lead iodide (PEAPbI4) have been a popular choice for many applications. However, these materials typically have exciton binding energies of 100s of meV that can thus greatly alter optoelectronic properties due to a large population of excitons present at ambient temperatures [1]. Using both transient and steady-state spectroscopic methods, we have investigated the excitonic properties of quasi-2D perovskites including PEAPbI4 and thiophenemethylammonium (ThMAPbI4). In PEAPbI4, we separate contributions from free charge-carriers and excitons and observe ultrafast cooling of free charges followed by slower recombination of both excitons and a minority concentration of free charges [2]. In ThMAPbI4, we investigate the temperature-dependent properties from room temperature to 77 K and characterize emission from a defect-bound exciton at low temperatures [3]. Together, these studies highlight the relationship between structure and optoelectronic properties of these materials.
A common strategy for circumventing the poor transport properties of quasi-2D perovskites is to form heterostructures with 3D perovskites, where quasi-2D materials are incorporated into 3D perovskite thin films as either a mixture or a capping layer. Using a combination of visible transient absorption spectroscopy (TAS) and optical pump/THz probe spectroscopy (OPTP), we have evaluated device-relevant 3D perovskite thin films which have been treated with phenylethylammonium salts in order to preferentially form RP phases at the surface of the films [4]. In all cases, we find that the surface is a complex mixture of 2D and 3D components. In addition to observing that the charge-carrier dynamics are sensitive to the film preparation method, we distinguish between bulk and surface passivation effects and query charge transfer between RP and 3D species.
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.