Proceedings of MATSUS Fall 2024 Conference (MATSUSFall24)
DOI: https://doi.org/10.29363/nanoge.matsusfall.2024.238
Publication date: 28th August 2024
Near- and short-wave infrared (NIR/SWIR) active quantum dots have attracted considerable interest for applications in biotechnology, energy conversion and optoelectronics. Most research has been conducted on binary lead- and mercury-based QDs due to the comparable simplicity of their synthesis and their outstanding properties. RoHS (Restriction of Hazardous Substances in Electrical and Electronic Equipment)-compliant III-V compounds such as InAs and InSb are currently emerging, but their more covalent character, high oxidation sensitivity and scarcity of appropriate group-V precursors make it much more challenging to achieve precise control of their size, shape and surface state.
This presentation will focus on novel types of PbS-based core/shell structures. For the PbS core QD synthesis, a library of thioureas was synthesized as the sulfur precursors, which gave rise to a broad size range, excellent monodispersity and high reaction yield. This approach was also adapted to the continuous flow synthesis of larger amounts of QDs. A widely adopted strategy to enhance the PLQY of PbS QDs consists of their overcoating with a CdS shell using Pb/Cd cation exchange. Nonetheless, this procedure leads to a continuous blue-shift of the emission wavelength with proceeding cation exchange, while the PL intensity goes through a maximum, making it difficult to optimize the emission for a desired wavelength. To avoid cation exchange, we added an intermediate buffer shell of ZnS on the PbS core QDs before growing the CdS shell. We present the optical and structural properties of the novel PbS/ZnS/CdS core/shell/shell QDs as a function of the different shell thicknesses and compare them with results from ab-initio simulations on slabs of these structures. In an extension of this study, PbS/CdS QDs obtained via cation exchange have been overcoated using a reactive monomolecular precursor to obtain PbS/CdS/CdS thick-shelled QDs. Finally, recent advances in the synthesis of InAs-based core/shell structures will be presented.
We acknowledge support from ST Microelectronics and the European Union's Horizon research and innovation program under grant agreement n° 101135704 (HortiQD).
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.