Proceedings of nanoGe September Meeting 2015 (NFM15)
Publication date: 8th June 2015
This presentation will describe colloidal synthetic methods that have been developed for silicon (Si) nanostructures that yield control of size and shape. We have been exploring two routes to the synthesis of Si nanomaterials with quantum-size dimensions: (1) metal-seeded growth of Si nanorods by arrested precipitation and (2) high temperature (>1100oC) solventless decomposition of silicon suboxide (hydrogen silsequioxane, HSQ) to form Si nanocrystals embedded in SiO2 that are processed by etching and ligand passivation. Both routes produce colloidal dispersions of fluorescent Si nanomaterials. The HSQ route produces Si quantum dots that we have been using as model systems to understand effective surface passivation routes to colloidal Si nanomaterials. We have discovered a room temperature hydrosilylation strategy promoted by carboxylic acid or ester functional groups and have demonstrated this for styrene passivation without homogeneous self-polymerization in solution. We have found that thiol passivation of Si quantum dots is possible, but that the monolayer coating is highly susceptible to hydrolysis and degradation in the presence of water. We have also shown that organic chromophores with strong light absorption can be grafted to the nanocrystals to improve fluorescence brightness. The Si quantum dots can also be made with very uniform size and assembled into superlattices. We will show examples of Si quantum dot superlattices in which the nanocrystals exhibit a high degree of crystalline orientational order. In the case of Si nanorods, an effective surface etching and ligand passivation strategy was developed to stabilize the fluorescence of the nanorods. Some comparison of Si quantum dot and quantum rod optical properties will be presented.
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.