Proceedings of September Meeting 2016 (NFM16)
Publication date: 14th June 2016
I will present our recent work on transient absorption microscopy (TAM) as a new tool to image dynamics in 2D nanostructures with simultaneously high spatial (~ 200 nm) and temporal resolution (~ 200 fs) to investigate environmental effects in carrier dynamics and transport of 2D Nanostructures. I will discuss two examples of such transient absorption microscopic studies. Femtosecond transient absorption microscopy was employed to study the environmental effects in carrier relaxation of graphene. We observed that the hot phonon effect occurs at much lower excitation intensity for suspended graphene compared to substrate-supported graphene. The lifetime of the intrinsic optical phonons created by charge carrier relaxation is also longer for suspended graphene compared to substrate-supported graphene. We attributed these observations to additional cooling channels provided by coupling between the charge carriers of graphene and the surface optical phonons of the substrate. These results show the importance of the environment in controlling the carrier properties of graphene.Recent success in fabricating graphene has inspired researchers to search for semiconducting analogues of graphene in hopes to retain 2D crystallinity while providing a bandgap. In particular, monolayer MoS2 has recently emerged as a promising candidate. The second study I will present is the investigation of exciton dynamics in atomically thin and semiconducting MoS2 crystals. By controlling the dielectric environment around monolayers of MoS2 crystals, our measurements provide a comprehensive understanding on intrinsic exciton dynamics, quantum confinement effect, exciton-phonon coupling, as well as how the dielectric environment alters optical properties and energy relaxation processes in these novel 2D crystals.
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.