Recent Submissions

  • Mesoscale modeling of quantum yield in nanocrystalline devices 

    Contributor:Irvin, Samantha; Flammer, Philip David; Lusk, Mark; Beach, Joe; van de Lagemaat, Jao; Graf, Peter
    A new solar material features silicon nanocrystals (nc-Si) within an amorphous silicon (a-Si) matrix. The efficiency with which photons are absorbed and converted to electric current depends on the size, orientation, volume ...
  • Functionalization of 110 oriented silicon quantum wires 

    Contributor:Robert Lochner; Li, Huashan; Wu, Zhigang; Lusk, Mark T.
    Silicon nanowires (SiNW) are cylindrical crystals of diamond structured silicon with a length much greater than diameter. Silicon nanowires are ~1-100 nm in diameter, 110 direction dominates for wires less than 10 nm (Wu ...
  • Characterization of molecular magnets using EPR 

    Contributor:Riskey, Kory; Miller, Joel; Simonds, Brian; Taylor, P. Craig
    Molecules involving tetracyanoethylene (TCNE) and transition or rare earth compounds have been found to exhibit magnetic properties at low temperature. One compound, however, with V and TCNE has been found to have an ...
  • Immobilization of heteropolyacids in PEM fuel cell membranes via copolymerization 

    Contributor:Jessop, Jeri D.; Herring, Andrew M.; Horan, James L.; Kuo, Mei-Chen
    Nafion is the current standard by which PEM fuel cell membranes are measured. It is a PFSA (perfluoro sulfonic acid) polymer that is used to conduct ions such as protons. This material is only useful at low temperature ...
  • Methods in data clustering 

    Contributor:Parker, Charley; Coffey, Mark
    Data clustering methods explored included: K-means algorithm, which minimizes the distances from all data points to the centroid of each point's associated cluster; power iteration, which approximates eigenvectors of a ...
  • Photoluminescence quenching and hot carrier transfer in nanocrystalline silicon 

    Contributor:Miller, Levi; Fields, Jeremy; Collins, Reuben; Taylor, Craig
    The maximum efficiency of silicon photovoltaic cell is not 31% but 74%. Collecting hot carriers before they thermalize is a means to achieve this. In this regard, amorphous semiconductors are potentially useful materials. ...
  • Renewable energy applications for oil shale production 

    Contributor:Robles, ElsaBoak, Jeremy;
    To reduce the environmental impact of oil shale extraction it would be valuable to use renewable energy sources to provide power to heat the oil shale. This poster presents analysis of different renewable resources that ...
  • Investigating the metastabilities surrounding hydrogen hydrates for energy storage applications 

    Contributor:Arias, Melissa; Shebowich, Michelle; Grim, Robert Gary; Kerkar, Prasad; Sum, Amandeu; Koh, Carolyn
    Hydrogen hydrate in its most thermodynamically stable form, sII, holds a maximum 3.8 wt. % hydrogen, less than the 5.5 wt. % needed to meet the Department of Energy 2015 goal. This novel work explored H2 hydrate structure, ...
  • Characterization of defect density of varying crystal volume fraction in nano crystalline silicon 

    Contributor:Gomez, Stephanie; Riskey, Corey; Taylor, P. Craig
    The objective of this research is to determine how the volume fraction of nano crystalline silicon affects the number of defects caused by dangling bond spins.
  • High performance computing applications for material physics 

    Contributor:Johnson, MatthewKaiser, Timothy;
    The Spanish Initiative for Electronic Simulations with Thousands of Atoms (SIESTA) is a powerful modeling tool that analyzes the electrodynamics of a molecule or solid. It can also evaluate the photoelectric characteristics ...
  • Vertical alignment of gold nanorods with AC voltage 

    Contributor:Smith, Lois; Wu, Ning
    The ability to easily and efficiently align nanorods would improve solar cells and sensors by leaps and bounds. We choose Au nanorods as a model system and studied their alignment under an electric field. The alignment of ...
  • The effect of environmental aging on the mechanical properties of PMMA material used in concentrating photovoltaics 

    Contributor:Carloni, Joseph; Wilkinson, Taylor M.; Miller, David C.; Packard, Corinne E.
    Concentrating photovoltaics (CPV) modules use focused light. A frensed lens requires less material and is lighter than a bulky and expensive traditional domed lens. A promising lens material is poly(methyl methacrylate) ...
  • A facile method for making monodispersed colloidal plantinum nanocrystals 

    Contributor:Snow, Kyle; McCann, Kevin; Yang, Yongan
    Platinum nanoparticles are extremely small clusters of Pt atoms, usually 1-50 nanometers (nm) in width, homogeneously dispersed in a colloidal solution. Pt nanoparticles have excellent catalytic strength, even more so than ...
  • Recovery of iodine from produced water through anion resin exchange 

    Contributor:Fruit, John Terrell; Xu, Pei; Hoppe-Jones, Christiane; Cath, Tzahi
    The element iodine, I2, is very important to current society. It is used to make products such as film, dye, supplements, medicine and many organic compounds. The use of iodine will continue to expand in application and ...
  • NMR analysis of passivated silicon quantum dots 

    Contributor:Sorenson, Blaire; Yang, Yongan; Cheng, Jifang; Williams, Kim R.
    The increased demand for energy calls for the development of new approaches towards renewable energy sources. Solar energy is one of the most abundant energy resources that can be converted to thermal, chemical and electrical ...
  • Synthesis and characterization of Br- and Cl- anion exchange membranesfor use in alkaline polymer electrolyte fuel cells 

    Contributor:Tansey, Emily; Herring, Andrew M.; Horan, James L.; Vandiver, Melissa
    Proton exchange membrane (PEM) fuel cells utilize pure hydrogen fuel and platinum-based catalysts. Hydrogen has a relatively low energy density, so large-scale fuel storage is required to operate PEMs. Pt-based catalysts ...
  • Raman characterization of ZnO and Si nanowires 

    Contributor:Whalen, Jessica; Collins, Reuben; Furtak, Thomas
    Organic Photovoltaics (OPVs) have gained favor recently for low production cost and potential for roll-to-roll flexible substrates. Though efficiency is fundamentally less than commercial PVs, low production temperature ...
  • Successive ionic layer adsorption and reaction for organic/inorganic interfaces 

    Contributor:Hunt, Heather; Collins, Reuben; Furtak, Thomas
    Zinc oxide is a promising material for use in organic electronics, particularly organic photovoltaics (OPVs). ZnO has a large band gap around 3.3 eV, has a high electron mobility, is non-toxic, and can be processed using ...
  • Bandgap engineering in graphene nanomesh for photovoltaics 

    Contributor:Vodnik, Douglas; Oswald, William; Wu, Zhigang
    Graphene, a flat monolayer of carbon atoms tightly packed into a two-dimensional honeycomb lattice, was first isolated in 2004. Graphene has attracted a great deal of research interest due to its many amazing properties, ...
  • Altering shear thickening of chemical mechanical polishing slurries through the addition of electrolytes and organic solvents 

    Contributor:Yohe, Benjamin; Crawford, Nathan; Liberatore, Matthew; Williams, Kim
    Chemical mechanical polishing (CMP) planarizes and polishes semiconducting materials commonly used in microelectronics. The CMP process depends highly on the slurry composition, particle size and concentration, pH, and ...

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