category » Materials

Nanoscale Stress State Characterization of InAlN/GaN Nanoribbon HEMT Structures
  • Due to its high band gap energy and superb electronic-carrier mobilities, GaN is fast becoming the material of choice for…


Graphene Cathode-based ZnO Nanowire Hybrid Solar Cells
  • Semiconducting nanowire-based solar cells have gained interest because of their potential to achieve one-dimensional charge transport pathways and large interfacial…


Towards Highly Scaled Gate Length Asymmetrically Strained Ge Nanowire p-MOSFETs
  • Ge nanowires are of interest for future sub-10-nm gate length p-MOSFETs because of the excellent electrostatic control afforded by the…


ZnO Nanowire Arrays for Enhanced Photocurrent in PbS Quantum Dot Solar Cells
  • Here we demonstrate a solution-processed ordered bulk heterojunction quantum dot (QD) solar cell with AM1.5G power conversion efficiencies of up…


Flexible High-Density MoS2 Sensor Arrays for Monitoring Action Potentials
  • Monolayer MoS2, a transition metal dichalcogenide, is a novel flexible semiconducting material with a 1.8 eV direct band gap.  Recent…


Nano-patterning of J-aggregate Thin Films
  • We show patterning of thin J-aggregate[1] films using nano-imprinting. Unlike the conventional microfabrication techniques, such as direct-write or lift-off processes,…


Binary Nanoparticle Superlattices Formed from Highly Luminescent Core-Shell Quantum Dots and Their Photoluminescence Properties
  • Colloidal semiconductor nanocrystals or quantum dots (QDs) offer size-tunable absorption and luminescence spectra, permitting a broad range of applications in…


High-performance Near-infrared Light-emitting Devices using Core-shell (PbS-CdS) Colloidal Quantum-dots
  • Near-infrared light sources integrated at room temperature with any planar surface could be realized by harnessing the broad spectral tunability,…


Breakdown Voltage of High-voltage GaN FETs
  • GaN FETs offer superior advantages in high-voltage and high-temperature operation due to its large bandgap (3.4 eV) and high breakdown…


Recombination Dynamics of Charge Carriers in Nanostructured Solar Cells
  • Nanostructured solar cells attract increasing attention as a promising photovoltaic (PV) technology[1]. Generation of free charge carriers in nanostructured PV…


Electronics on MoS2 and Other 2D Semiconductors
  • After enabling much of the modern world for more than 60 years, in the near future electronics will develop in…


Towards a Superlattice-source Nanowire FET with Steep Subthreshold Characteristics
  • Achieving a sharp subthreshold swing (S) is crucial to enable the supply voltage scaling that is necessary to reducing power…


Electronic Transport Studies of Thin Film Bi and Bi1-xSbx
  • Currently bulk Bi and BixSb1-x­ have the best known thermoelectric (TE) properties at cryogenic temperatures. These properties can be further…


Micron- and Submicron-thick Parylene Substrates for Transfer Printing and Solar Applications
  • Transfer printing of thin metal films enables the fabrication of both planar and suspended membrane electrodes for microelectromechanical (MEMS) sensors…


Effect of Morphology in Quantum Dot Electronics
  • Quantum dots (QDs) are exciting materials because their bandgap is dependent on the dot size. The use of QDs allows…


Ionic Conduction Studies in TlBr Radiation Detector Materials
  • Detection of high-energy radiation (e.g., γ-rays) is key in nuclear non-proliferation strategies.  When a wide-band gap semiconductor detector intercepts a…


Applications of Nanoimprinted Structures In Organic Photovoltaics
  • Small-molecule organic photovoltaic cells (OPVs) have the potential to be a low-cost, flexible power conversion solution to many energy problems[1]….


Heat Transport in Nanostructured Materials
  • Thermal management in nanoscale materials dramatically affects the efficiency of novel energy generation technologies, and engineering devices with appropriate heat…


Self-similarity of Contact Line Depinning from Textured Superhydrophobic Surfaces
  • We report a technique for observing the dynamic behavior of a liquid contact line on superhydrophobic surfaces at high magnification…


Improved Carbon Nanotube Ultracapacitor Electrodes for Storage
  • Due to their mechanical, thermal, and electrical properties and their natural ability to grow on a variety of metallic and…


Condensation on Micro/Nanostructured Superhydrophobic Surfaces
  • Water condensation on surfaces is a ubiquitous phase-change process that plays a crucial role in nature and across a range…


Spatially Resolved Exciton Dynamics in Quantum Dot Thin Films
  • The diffusion of excitonic energy from within the photosensitive layer of a photovoltaic cell towards the charge separation interface is…


Lubricant-Impregnated Nanotextured Surfaces for Efficient Heat Transfer during Condensation
  • Despite years of advancement in making energy systems more efficient, the predominant mode of condensation seen in large-scale industrial processes…


Optimizing Emitter-to-Absorber Area Ratio for Improved Efficiency in Planar Solar Thermophotovoltaics
  • Solar thermophotovoltaic (STPV) devices have the potential to overcome the Shockley-Queisser limit by converting solar radiation to a narrow-band thermal…


Scalable Superhydrophobic Copper Oxide Surfaces for Enhanced Heat Transfer
  • Vapor condensation is observed in everyday life and routinely utilized in industry as an effective means of transferring heat. In…


Properties of Polymorphs of Belite
  • Portland cement clinker contains four major phases; alite (C3S) is the most dominant (50-70% by mass) and highly reactive with…


Understanding the Light Emission Mechanisms in InGaN by Correlating its Structural and Optical Properties
  • Solid state light-emitting diodes (LEDs) containing InxGa1-xN (0 ≤ x ≤ 1)/GaN hetrostructures as active components are of particular importance…


Self-assisted GaAs Nanowire Growth by MOCVD
  • Nanowires combine the intrinsic properties of semiconductors with low dimensionality, which makes them potential building blocks for optoelectronic applications. GaAs…


Investigation of Fuel Cell Cathode Performance in Solid Oxide Fuel Cells – Application of Model Thin Film Structures
  • Understanding the oxygen reduction reaction (ORR) kinetics at solid oxide fuel cell (SOFC) cathodes is considered critical for enhanced performance,…


Catalytic Oxygen Storage Materials
  • Combustion of fossil fuels, essential for electricity generation and vehicular propulsion, is generally incomplete, leading to harmful NOx, CO, and…


Mechanical Pressure-induced Solid State Solvation in Organics Thin Films
  • Significant technological progress of organic semiconducting structures has led to their commercialization in the form of organic LED displays, solid…


Efficiency Comparison of m- and c-directional GaN Nanowire-based LEDs on Si
  • III-nitride nanowire-based light-emitting diodes (LEDs) are promising alternatives to thin-film LEDs for solid-state lighting[1]. Facile strain relaxation in nanowires allows…


Stretchable Pressure- and Shear-sensing Skin Printed from PDMS
  • In the fields of robotics and prosthesis design, there is need for inexpensive, wide-area pressure- and shear-sensing arrays that can…


Flexible Probes for in vivo Recording and Stimulation of Neural Tissue
  • Probing and stimulating neural tissue is important to understand fundamentals of information processing and pathologies of the nervous system such…


Tunable Surface Plasmonics on Electric-gated Nanostructures and its Coupling with Quantum Dot Emission
  • The main goal of this work is to introduce functional natural materials into the design of surface plasmonic structures and…


Correlation of Doping, Structure and Carrier Dynamics in a Single GaN Nanorod
  • GaN-based nanowires and nanorods are promising materials systems for optoelectronic applications such as high efficiency light emitting diodes[1],[2] or low…


Design and Fabrication of Magnetically Tunable Microstructured Surfaces
  • Micro- and nanostructured surfaces have broad applications ranging from liquid transport in microfluidics and cell manipulation in biological systems to…


Rapid Identification of Stacking Orientation in Isotopically Labeled Chemical-vapor Grown Bilayer Graphene by Raman Spectroscopy
  • The growth of large-area bilayer graphene has been of technological importance for graphene electronics. The successful application of graphene bilayers…


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Quantitative Analysis and Modeling of Templated Solid-state Dewetting of Thin Single-crystal Ni Films
  • Thin films are generally metastable in the as-deposited state and will dewet (agglomerate) when heated.  Nanometer scale films (<100 nm…


Lithographically-defined ZnO Nanowire Growth
  • Photovoltaics (PVs) with inorganic zinc oxide nanowire (ZnO NW) active layers are possible for future generations of technology due to…


Organic Light Emitting Devices on Plastic and Paper Substrates
  • The successful fabrication of optoelectronics on economical, flexible, and lightweight substrates such as plastic and paper could pave the way…


Understanding and Controlling the Substrate Effect on Graphene Electron-transfer Chemistry via Reactivity Imprint Lithography
  • Graphene has exceptional electronic, optical, mechanical, and thermal properties, which provide it with great potential for use in electronic, optoelectronic…


Concomitant Co-crystallization on Engineered Surfaces
  • A co-crystal is a crystalline material made up of two or more components. In pharmaceutical systems, co-crystallization is frequently used…


Absorption and Fluorescence Enhancement of Single Molecules and Quantum Dots Using an Excitonic Antenna
  • Nature presents us with a fundamental mismatch between the “size” of visible light (~250 nm in free space) and the…