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  • 1.
    Bi, Zhaoxia
    et al.
    Lund University, Sweden.
    Lenrick, Filip
    Lund University, Sweden.
    Colvin, Jovana
    Lund University, Sweden.
    Gustafsson, Anders
    Lund University, Sweden.
    Hultin, Olof
    RISE - Research Institutes of Sweden, ICT, Acreo. Lund University, Sweden.
    Nowzari, Ali
    Lund University, Sweden.
    Lu, Taiping
    RISE - Research Institutes of Sweden, ICT, Acreo. Lund University, Sweden.
    Wallenberg, Reine
    Lund University, Sweden.
    Timm, Rainer
    Lund University, Sweden.
    Mikkelsen, Anders
    Lund University, Sweden.
    Ohlsson, Jonas
    Lund University, Sweden.
    Storm, Kristian
    RISE - Research Institutes of Sweden.
    Monemar, Bo
    Lund University, Sweden.
    Samuelson, Lars
    Lund University, Sweden.
    InGaN Platelets: Synthesis and Applications toward Green and Red Light-Emitting Diodes2019In: Nano letters (Print), ISSN 1530-6984, E-ISSN 1530-6992, Vol. 19, no 5, p. 2832-2839Article in journal (Refereed)
    Abstract [en]

    In this work, we present a method to synthesize arrays of hexagonal InGaN submicrometer platelets with a top c-plane area having an extension of a few hundred nanometers by selective area metal-organic vapor-phase epitaxy. The InGaN platelets were made by in situ annealing of InGaN pyramids, whereby InGaN from the pyramid apex was thermally etched away, leaving a c-plane surface, while the inclined {101Ì1} planes of the pyramids were intact. The as-formed c-planes, which are rough with islands of a few tens of nanometers, can be flattened with InGaN regrowth, showing single bilayer steps and high-quality optical properties (full width at half-maximum of photoluminescence at room temperature: 107 meV for In 0.09 Ga 0.91 N and 151 meV for In 0.18 Ga 0.82 N). Such platelets offer surfaces having relaxed lattice constants, thus enabling shifting the quantum well emission from blue (as when grown on GaN) to green and red. For single InGaN quantum wells grown on the c-plane of such InGaN platelets, a sharp interface between the quantum well and the barriers was observed. The emission energy from the quantum well, grown under the same conditions, was shifted from 2.17 eV on In 0.09 Ga 0.91 N platelets to 1.95 eV on In 0.18 Ga 0.82 N platelets as a result of a thicker quantum well and a reduced indium pulling effect on In 0.18 Ga 0.82 N platelets. On the basis of this method, prototype light-emitting diodes were demonstrated with green emission on In 0.09 Ga 0.91 N platelets and red emission on In 0.18 Ga 0.82 N platelets.

  • 2.
    Hultin, Olof
    et al.
    Lund University, Sweden.
    Otnes, Gautne
    Lund University, Sweden.
    Samuelson, Lars
    Lund University, Sweden.
    Storm, Karin
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Simplifying Nanowire Hall Effect Characterization by Using a Three-Probe Device Design2017In: Nano letters (Print), ISSN 1530-6984, E-ISSN 1530-6992, Vol. 17, no 2, p. 1121-1126Article in journal (Refereed)
    Abstract [en]

    Electrical characterization of nanowires is a time-consuming and challenging task due to the complexity of single nanowire device fabrication and the difficulty in interpreting the measurements. We present a method to measure Hall effect in nanowires using a three-probe device that is simpler to fabricate than previous four-probe nanowire Hall devices and allows characterization of nanowires with smaller diameter. Extraction of charge carrier concentration from the three-probe measurements using an analytical model is discussed and compared to simulations. The validity of the method is experimentally verified by a comparison between results obtained with the three-probe method and results obtained using four-probe nanowire Hall measurements. In addition, a nanowire with a diameter of only 65 nm is characterized to demonstrate the capabilities of the method. The three-probe Hall effect method offers a relatively fast and simple, yet accurate way to quantify the charge carrier concentration in nanowires and has the potential to become a standard characterization technique for nanowires.

  • 3.
    Nordgren, N
    et al.
    YKI – Ytkemiska institutet.
    Rutland, MW
    YKI – Ytkemiska institutet.
    Tunable nanolubrication between dual-responsive polyionic grafts2009In: Nano letters (Print), ISSN 1530-6984, E-ISSN 1530-6992, Vol. 9, no 8, p. 2984-2990Article in journal (Refereed)
    Abstract [en]

    This study reports on a direct approach of quantitatively probing the nanotribological response of chemically end-grafted polyions. A combination of a quartz crystal microbalance with dissipation and atomic force microscopy, in the now well established colloidal probe mode, was utilized to investigate the stimuli-induced lubrication behavior between poly(2-(dimethylamino)ethyl methacrylate) grafts on gold. Force and friction measurements showed reversible transitions of up to an order of magnitude difference induced by varying the solvent conditions. The greatly enhanced lubrication observed at low pH was attributed to the formation of a repulsive, highly charged, hydrated cushion. At high pH the friction was significantly increased. The system turned attractive above the lower critical solution temperature with a small friction reduction interpreted as being due to nanoscopic flattening at the interfacial boundary.

  • 4.
    Xiong, Kunli
    et al.
    Chalmers University of Technology, Sweden.
    Tordera, Daniel
    Linköping University, Sweden.
    Emilsson, Gustav
    Chalmers University of Technology, Sweden.
    Olsson, Oliver
    rdot AB, Sweden.
    Linderhed, Ulrika
    RISE - Research Institutes of Sweden, ICT, Acreo.
    Jonsson, Magnus P.
    Linköping University, Sweden.
    Dahlin, Andreas B.
    Chalmers University of Technology, Sweden.
    Switchable Plasmonic Metasurfaces with High Chromaticity Containing only Abundant Metals2017In: Nano letters (Print), ISSN 1530-6984, E-ISSN 1530-6992, Vol. 17, no 11, p. 7033-7039Article in journal (Refereed)
    Abstract [en]

    Plasmonic color generation offers several advantages but is also limited by the cost and availability of noble metals like gold. In this work, we present color-tunable metasurfaces with high chromaticity and reflectivity consisting of an aluminum mirror, a dielectric spacer, and a plasmonic nanohole array in copper. Copper is shown to be an excellent alternative to gold when properly protected from oxidation and makes it possible to generate a wide RGB gamut covering 27% of the standard RGB. By patterning the metasurfaces into microscale pixel triplets, color photos can be well reproduced with high resolution over wafer-sized areas. Further, we demonstrate active modulation of the reflected intensity using an electrochromic conductive polymer deposited on top of the nanostructures by screen printing. This technology opens up for ultrathin and flexible reflective displays in full color, that is, plasmonic electronic paper, compatible with large-scale sustainable production.

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