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Transformative Power Semiconductor Technologies to Impact 21st Century Energy Economy, and Space and Defense Electronics
Online Presentations | 22 Sep 2010 | Contributor(s): Krishna Shenai | 927 users
This talk will focus on advanced power semiconductor materials, devices, circuits and systems that are needed in order to address this daunting challenge. Specifically we will discuss emerging silicon and wide bandgap materials and power devices, heterogeneous chip-scale power integration,...
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Nanotechnology Activities in Colombia: A Perspective From the Excellence Center for Novel Materials
Online Presentations | 11 Oct 2010 | Contributor(s): Pedro Antonio Prieto | 344 users
I will present the current state of R & D in the fields of condensed matter, novel materials, and nanotechnology in Colombia. I will initially consider Latin America and the Caribbean (LAC) to then visualize individual developments, as well as those for the region as a whole in these fields of...
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Electric and Magnetic Properties of Multiferroic Oxide Thin Films and Heterostructures
Online Presentations | 20 Oct 2010 | Contributor(s): Pedro Antonio Prieto | 605 users
Outline:IntroductionPreparation methods for oxide thin filmsOxide thin films and heterostructures Multiferroic materialsBiFeO3, YMnO3, BiMnO3 thin films and FE/FM CompositesConclusions
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TiCN/TiNbCN Multilayer System with Enhanced Tribological Properties
Online Presentations | 20 Oct 2010 | Contributor(s): Pedro Antonio Prieto | 249 users
Improvement in the mechanical properties of hard coatings such monolayer (TiN, CrN, AlCN, WC-Co, TiCN) [1], has been achieved using compositional gradient WC/C layer, or multilayered type [transition metal/transition carbide]n, [transition metal/transition nitride]n, [TiCN/ZrCN]n, among others....
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The Elusive Spin Transistor
Online Presentations | 11 Apr 2011 | Contributor(s): Supriyo Datta | 760 users
This presentation is a short introductory tutorial on spin-transistors.
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Design of Optoelectronically-active Polymers for Organic Photovoltaic Applications
Online Presentations | 08 Feb 2013 | Contributor(s): Bryan W. Boudouris | 2405 users
Organic photovoltaic (OPV) devices are of great interest due to their promise of providing flexible, lightweight, and inexpensive alternatives to their currently-used inorganic counterparts. However, large-scale implementation of these modules has been hampered due to their relatively low power...
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High-Rate Processing and Advanced Emitter Structures for CIGS PV Module Manufacturing
Online Presentations | 11 Jul 2013 | Contributor(s): B. J. Stanbery | 721 users
Achieving both macroscopic homogeneity and nanoscale heterogeneity for non-stoichiometric multinary compounds is a critical challenge for the success of copper indium gallium selenide (CIGS) photovoltaic cells. Co-evaporation yields world record performance, but is also a high-temperature vacuum...
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Engineered Defects in Wide Band-gap Semiconductors for Single-spin Sensing and Computation
Online Presentations | 26 Mar 2014 | Contributor(s): Abram Falk | 955 users
Using infrared light at near-telecom wavelengths, I will show that spin states in silicon carbide exhibit long quantum coherence times that persist up to room temperature. I will also discuss new strategies for generating coherent spin interactions at the nanoscale using defects in inequivalent...
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Optical Multi-Dimensional Coherent Spectroscopy of Semiconductor Nanostructures
Online Presentations | 08 Apr 2014 | Contributor(s): Steven Cundiff | 377 users
I will give an introduction to optical two-dimensional coherent spectroscopy and then present our use of it to study optical resonances in semiconductor nanostructures. In quantum wells, our results show that many-body effects dominate the light-matter interaction for excitons in semiconductors...
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Disordered Photonics
Online Presentations | 11 Apr 2014 | Contributor(s): Hui Cao | 603 users
Most of the research in the field of photonics has focused on understanding and mitigating the effects of disorder which are often detrimental. For certain applications, however, intentionally introducing disorder can actually improve the device performance, e.g., in photovoltaics optical...
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Insight into Time-Resolved Photoluminescence Measurements on Thin-film Solar Cells using Numerical Simulations
Online Presentations | 09 Oct 2014 | Contributor(s): Ana Kanevce | 408 users
Increased efficiency in thin-film solar cells requires higher degree of understanding of the recombination mechanisms, and separating the various types of recombination involved. Time resolved photoluminescence (TRPL) measurement is a contactless and quick measurement method, and therefore one of...
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Active Nanophotonics: From Coherent Control of Quantum Emitters to Plasmonic Nanolasers
Online Presentations | 28 Apr 2014 | Contributor(s): Ken Shih | 1083 users
Light-matter interaction at nanometer scale is emerging as one of the most exciting fields in nanoscience. In combination with the advanced materials synthesis technique to tailor novel low-dimensional electronic systems, new doors are open toward design and realization of nanophotonic devices...
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Coherent Nonlinear Optics, Backward Waves and Negative Spatial Dispersion
Online Presentations | 16 May 2014 | Contributor(s): Alexander K. Popov | 266 users
Extraordinary frequency-converting nonlinear-optical propagation processes associated with backward electromagnetic and elastic waves are described. Particular realizations of negative spatial dispersion which enable such waves are investigated.
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Ongoing Transformation of Computational Nanophotonics
Online Presentations | 18 May 2014 | Contributor(s): Alexander V. Kildishev | 1005 users
Computational nanophotonics is one of the central tools of the science of light and photonic device engineering. It plays a crucial role in enabling optical technologies ranging from bio-sensing to quantum information processing. Up to the present, a plethora of various methods and commercial...
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Coupling of Electron Spin Dynamics and Nanomechanical Motion in Carbon Nanotubes
Online Presentations | 20 Nov 2014 | Contributor(s): Mark Rudner | 120 users
Due to their low masses and high stiffnesses, nanostructures made out of atomically-thin carbon- based materials such as graphene and carbon nanotubes (CNTs) feature high mechanical oscillation frequencies and large zero-point vibration amplitudes. These properties open many avenues for exploring...
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Impedance Spectroscopy Methods Applied to Thermoelectric Materials and Devices
Online Presentations | 19 Nov 2014 | Contributor(s): Jorge García-Cañadas | 1000 users
Impedance spectroscopy is one of the most helpful techniques for the characterization of a wide range of devices (solar cells, supercapacitors, fuel cells, etc.). However, it is not extensively used in the thermoelectric field and most of existing work is mainly focused on determining the figure...
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Spaser in Quantum Regime
Online Presentations | 12 Feb 2015 | Contributor(s): Mark I Stockman | 389 users
The spaser have been introduced theoretically and discovered experimentally. We briefly consider quantum theory and latest results on spaser as an ultrafast quantum generator and amplifier of nanoplasmonic fields, ultrabright nanolabel, and highly-efficient nanosensor. We present latest original...
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Addressing Societal-scale Challenges with Nanoscale Materials: Flexible, Impedance-sensing “Smart Bandages” Enable Early Detection of Pressure Wounds
Online Presentations | 20 Apr 2015 | Contributor(s): Sarah Swisher | 419 users
In this talk, I will introduce our work developing solution-processed materials for flexible electronics, with emphasis on how these materials will enable new applications. I will then focus on one example: our recent development of a “smart bandage” prototype for detecting and...
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New Frontiers in Terahertz Technology
Online Presentations | 13 May 2015 | Contributor(s): Mona Jarrahi | 779 users
In this talk, I will describe some of our recent results on developing fundamentally new terahertz electronic/optoelectronic components and imaging/spectrometry architectures to mitigate performance limitations of existing terahertz systems.
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Adventures with Oxide Interfaces: Electronics, Magnetism, Memory, Energy and Biology
Online Presentations | 25 Feb 2016 | Contributor(s): T. Venky Venkatesan | 550 users
In this talk I share a personal close up view of the evolution of this field and where I see it going. I will cover polar/non-polar oxide interface conductivity, defect induced magnetism, FE tunnel junctions and some recent work on bio-oxide interfaces.