Publication date: 23rd September 2021
Lead Halide Perovskites (LHP) have attracted a lot of interest over the last decade due to their outstanding optical and electronic properties making them a highly relevant material for high efficiency optoelectronic devices, especially in photovoltaics. LHP nanocrystals (NCs) further exhibit a high photoluminescence (PL) quantum yield turning them into a highly relevant material for emission applications (LEDs, lasers). However, NCs are routinely processed in colloidal suspension which introduces some limitations. Ligands compromise the performance in a device (as they hamper charge transport) and, together with solvents, make it difficult to isolate their role when studying light-matter interaction in this nanosized material.
Herein we present a study on the photophysical properties of ligand-free LHP NCs grown within a nanostructured metal-oxide matrix (Figure. 1.a). Similar to previous studies on their bulk counterpart [1], LHP NCs undergo pronounced PL activation and darkening processes under illumination (Figure 1.b) which are strongly dependent on the surrounding atmosphere. Different crystal-sized samples are compared, from micrometric (thin films) to nanometric scale, in order to evaluate the morphology dependence.
Further, a model to fit the time evolution of PL is proposed where activation and darkening processes are assumed to take place simultaneously. Activation (kact) and darkening rates (kdecay) are obtained and their evolution with the amount of surrounding oxygen retrieved. These results lead us to conclude that photo-induced PL activation/darkening are mainly a volume/surface-related processes. [2].
Financial support of the Spanish Ministry of Science and Innovation under grant MAT2017-88584-R (AEI/FEDER,-UE) is gratefully acknowledged.
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.