Bulletin of the American Physical Society
APS March Meeting 2015
Volume 60, Number 1
Monday–Friday, March 2–6, 2015; San Antonio, Texas
Session B3: Invited Session: Condensed Matter Physics in Latin America I |
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Sponsoring Units: FIP Chair: Alex de Lozanne, University of Texas at Austin Room: 002AB |
Monday, March 2, 2015 11:15AM - 11:51AM |
B3.00001: An overview of Experimental Condensed Matter Physics in Argentina by 2014, and Oxides for Non Volatile Memory Devices: The MeMOSat Project Invited Speaker: Pablo Levy In the first part of my talk, I will describe the status of the experimental research in Condensed Matter Physics in Argentina, biased towards developments related to micro and nanotechnology. In the second part, I will describe the MeMOSat Project, a consortium aimed at producing non-volatile memory devices to work in aggressive environments, like those found in the aerospace and nuclear industries. Our devices rely on the Resistive Switching mechanism, which produces a permanent but reversible change in the electrical~resistance across a~metal-insulator-metal structure by means of a pulsed protocol of electrical stimuli. Our project is devoted to the study of Memory Mechanisms in Oxides (MeMO) in order to establish a technological platform that tests the Resistive RAM (ReRAM) technology for aerospace applications.~A review of MeMOSat's activities is presented, covering the initial Proof of Concept in ceramic millimeter sized samples; the study of different oxide-metal couples including (LaPr)$_{~2/3}$Ca$_{1/3}$MnO, La$_{2/3}$Ca$_{1/3}$MnO$_{3}$, YBa$_{2}$Cu$_{3}$O$_{7}$, TiO$_{2}$, HfO$_{2}$, MgO and CuO; and recent miniaturized arrays of micrometer sized devices controlled by in-house designed electronics, which were launched with the BugSat01 satellite in June2014 by the argentinian company Satellogic. [Preview Abstract] |
Monday, March 2, 2015 11:51AM - 12:27PM |
B3.00002: Brazilian Nanotechnology Initiative Invited Speaker: Adalberto Fazzio In Brazil there is intense research activity in nanotechnology, most of these developed in universities and research institutes. The Brazilian Nanotechnology Initiative (BNI) aims to integrate government actions to promote the competitiveness of the Brazilian industry. This initiative is founded on support for research and development in the laboratories of the National Laboratories for Nanotechnology (SisNANO), starting from an improvement in infrastructure and opening of laboratories for users of academia and business, promoting interaction and transfer knowledge between academia and business. Country currently has 26 thematic networks of nanotechnology, 16 --Virtual-National Institutes of Technology, seven National- Laboratories and 18 Associate Laboratories, which comprise the SisNANO. Seeking to expand and share governance with other government actors, the Interministries Committee for Nanotechnology was set up, composed of 10 ministries, and has the task of coordinating the entire program of the Federal Government Nanotechnology.Cooperation activities are an important part of BNI. Currently Brazil has cooperation programs with U.S., China, Canada and European Union among others. Recently, Brazil decided to join the European NanoReg program where 60 research groups are joining efforts to provide protocols and standards that can help regulatory agencies and governments. [Preview Abstract] |
Monday, March 2, 2015 12:27PM - 1:03PM |
B3.00003: Development of Micro and Nano Crystalline CVD Diamond TL/OSL Radiation Detectors for Clinical Applications Invited Speaker: Marcelino Barboza-Flores Modern radiotherapy methods requires the use of high photon radiation doses delivered in a fraction to small volumes of cancer tumors. An accurate dose assessment for highly energetic small x-ray beams in small areas, as in stereotactic radiotherapy, is necessary to avoid damage to healthy tissue surrounding the tumor. Recent advances on the controlled synthesis of CVD diamond have demonstrated the possibility of using high quality micro and nano crystalline CVD as an efficient detector and dosimeter suitable for high energy photons and energetic particle beams. CVD diamond is a very attractive material for applications in ionizing radiation dosimetry, particularly in the biomedical field since the radiation absorption by a CVD diamond is very close to that of soft tissue. Furthermore, diamond is stable, non-toxic and radiation hard. In the present work we discuss the CVD diamond properties and dosimeter performance and discuss its relevance and advantages of various dosimetry methods, including thermally stimulated luminescence (TL) as well as optically stimulated luminescence (OSL). The recent CVD improved method of growth allows introducing precisely controlled impurities into diamond to provide it with high dosimetry sensitivity. For clinical dosimetry applications, high accuracy of dose measurements, low fading, high sensitivity, good reproducibility and linear dose response characteristics are very important parameters which all are found in CVD diamonds specimens. In some cases, dose linearity and reproducibility in CVD diamond have been found to be higher than standard commercial TLD materials like LiF. In the present work, we discuss the state-of-the art developments in dosimetry applications using CVD diamond. [Preview Abstract] |
Monday, March 2, 2015 1:03PM - 1:39PM |
B3.00004: Influence of Quantum Dots and Surface Nanotexturization on Solar-Cell Performance Invited Speaker: Arturo Ayon The utilization of nanoparticles in combination with a photon capture scheme and selected thin-films, has enabled the demonstration of photovoltaic structures on single-crystal silicon substrates with an efficiency of 13.3{\%}. Hybrid solar-cells have also been considered as an alternative to develop cost-effective photovoltaic devices because the Schottky-union between organic and inorganic materials can be formed employing low-temperatures fabrication methods. We describe a hybrid solar-cell based on an ordered array of silicon-nanopillars and the conductive polymer PEDOT:PSS. The performance characteristics of the produced solar-cells was analyized in function of nanopillar height. A maximum power conversion efficiency of 9.65{\%} was observed for an optimized height of 400 nm. The effect of ultrathin films of Al$_{2}$O$_{3}$ realized employing an atomic-layer-deposition tool was also included in this study and its utilization further increased the measured efficiency to 10.56{\%}. The utilization of nanostar alloys enabled reaching an efficiency of 13.3{\%}. Intending to lower the cost of solar-cell manufacturing, additional tests have been carried out on structures with a total thickness \textless 20 $\mu$m. The discussed structures are considered promising towards the realization of high-efficiency solar-cells. [Preview Abstract] |
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