Proceedings of nanoGe September Meeting 2017 (NFM17)
Publication date: 20th June 2016
In this talk, I will discuss recent work from our group on characterizing, simulating, and engineering nanocrystal surfaces. First, I will present ab initio molecular dynamics (AIMD) on experimentally-relevant sized lead sulfide (PbS) NCs constructed with thiol or Cl, Br, and I anion surfaces. These simulations allow us to investigate the vibrational and dynamic electronic structure. We show that electron-phonon interactions can experimentally explain observed thermal broadening and carrier cooling rates in Pb-chalcogenide NCs. We demonstrate that electron-phonon interactions are suppressed in halide terminated NCs due reduction of both the thermal displacement of surface atoms and the spatial overlap of the charge carriers with these large vibrations. This work showing how surface engineering – guided by simulations – can be used to systematically control carrier dynamics emphasizes how important exact knowledge of NC shape and atomic structure it. A simple particle in a sphere is no longer sufficient. With the increasing complexity of multi-shell and graded core-shell structures, determining the exact shape and structure of NCs is challenging. Here, I will discuss how a combination of x-ray scattering and electron microscopy techniques can be used to obtain the detailed structures needed for simulation.
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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.
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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.
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