category » Nanotechnology

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…


Next-Generation Ultrafast Photo-Triggered Cathodes
  • State-of-the-art ultrafast cathodes are based on the photoelectric effect, where electrons are emitted from a flat surface using ultraviolet (UV)…


High-Current Cold Cathodes with Temporal and Spatial Emission Uniformity
  • Field emission arrays (FEAs) are an attractive alternative to mainstream thermionic cathodes, which are power hungry and require high vacuum…


Microfabricated Ionic Liquid Electrospray Sources with Dense Arrays of Emitters and Carbon Nanotube Flow Control Structures
  • Electrospray is a process to ionize electrically conductive liquids that relies on strong electric fields; charged particles are emitted from…


Nano-scale Metal Contacts for III-V FETs
  • In the last few years, III-V compound semiconductors have emerged as a promising family of materials to replace silicon in…


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…


Nanostructured Photocathodes for Compact Coherent X-ray Sources
  • Nanostructured photocathode arrays can be used as the electron sources for the compact coherent X-ray source. Femtosecond laser pulses were…


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,…


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…


Tunneling Nanoelectromechanical Switches Based on Organic Thin Films
  • With the silicon-based electronics reaching physical limits that inhibit continued improvements in device performance, much research has been directed towards…


Quantization in Bilayer Tunneling Transistors
  • Tunneling field-effect transistors (TFETs)[1] are promising for low-power applications due to their potential to achieve a subthreshold swing (SS) lower…


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 Self-aligned InGaAs Trigate MOSFET
  • Si-based CMOS technology is approaching the limits of its capabilities, and as a result there is extensive research into looking…


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…


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…


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]….


Self-aligned Gated Tip Arrays for Low-voltage, High-pressure Field Ionization of Gases
  • Field ion sources operate based on field ionization (FI) phenomena in which an electron tunnels out of a molecule under…


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…


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…


Nano-thin Encapsulation of Photovoltaics via Atomic Layer Deposition
  • Device lifetime is a key figure of merit for solar cells and impacts the levelized energy cost ( $/(kW*hr) )…


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…


Engineering Energy Level Alignment in Lead Sulfide Quantum- Dot Photovoltaics through Ligand Exchange
  • Solar cells based on lead sulfide colloidal quantum dots (PbS QDs) have made dramatic improvements in efficiency in recent years,…


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…


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…


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…


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…


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…


Silicon Field Emission Devices for X-ray Generation
  • This work focuses on developing an X-ray source using microfabricated silicon field emission devices. In the X-ray source, the electrons…


Aligned CNT-based Microstructures and Nano-engineered Composite Macrostructures
  • Carbon nanotube (CNT) composites are promising new materials for structural applications thanks to their mechanical and multifunctional properties. We have…


Nanoporous Elements with Layer-by-layer Assembly in MEMS with a Focus on Microfluidic Bioparticle Separation
  • We have integrated ultra-porous (99% porous) elements (nanoporous forests of vertically aligned carbon nanotubes (VACNTs)) in MEMS, showing their use…


Preventing Catastrophic Failures: Nano-engineered Multi-physics Materials for Structural Applications
  • Catastrophic structural failures cause many physical and personal losses, with prevention estimated at billions of dollars in savings each year….


Resolution Limits of Electron-beam Lithography toward the Atomic Scale
  • Electron-beam lithography (EBL) readily enables the fabrication of sub-10-nm features[1]. However, the resolution limits of this technique at length scales…


Charge Transfer at Junctions of a Single Layer of Graphene and a Metallic Single Walled Carbon Nanotube
  • In this work we fabricate and study junction between a single walled carbon nanotube (SWNT) and a monolayer of graphene…


Fabrication of Aperiodic Subwavelength Nanostructures by Grayscale Interference Lithography (GIL)
  • Interference lithography (IL) is one of the most effective and low-cost approaches for large-area nano-patterning and nanostructure fabrication; IL has…


Fabrication of Si Nanowire-Based Capacitors for Power Management
  • Capacitors with high capacitance density (capacitance per footprint area) have potential applications in autonomous microsystems and for power management in…


L-shaped Resonant Microring Filter with Integrated Thermal Tuner
  • Silicon photonics enables wavelength-division multiplexed (WDM) networks to be efficiently and cost effectively implemented on chip with potential for multi-terabit/s…


L-shaped Resonant Microring Modulator
  • On- and off-chip bandwidth and energy scaling are pushing the limits of CMOS and VCSEL technology, which allow only a…


Adiabatic Resonant Microring Modulators with Integrated Thermal Tuner
  • Wavelength division multiplexed systems can achieve high bandwidth by utilizing many channels on a single fiber as opposed to current…


Vertical Junction Silicon Microdisk Modulator with Integrated Thermal Tuner
  • Silicon photonics, because it enables wavelength division multiplexed (WDM) systems, will help to minimize the number of fibers required in…


Vertical Junction Silicon Microdisk Modulators at 25Gb/s
  • High-performance computing systems require high bandwidth, low power, and scalable optical interconnects to maintain balanced communications in future exascale machines….


Silicon Nanowires for Chemical Sensing Systems
  • Silicon nanowires (NWs) have attracted interest for sensing applications due to their high surface-to-volume ratios. When a NW is configured…


CMP Slurry Abrasive Particle Agglomeration Modeling
  • Formerly we presented results of our theoretical agglomeration model for chemical mechanical planarization (CMP) under the primary motivation of understanding…


Inverted Nanocone Arrays with High Aspect Ratio for Mass-producible Multifunctional Films
  • Inspired by natural structures in insect compound eyes, nanocone structures form an effective medium with an axial gradient in the…


Figure 2
Single- and Multi-wall Carbon Nanotube Growth on Nanoscale Zirconia and Other Oxides as Non-metallic Catalysts
  • This work focuses on the development of non-metallic nanoparticles (NPs) that can catalyze carbon nanofiber (CNF) and nanotube (CNT) growth…


Controlled Placement of Colloidal Quantum Dots in Sub-15-nm Clusters
  • Semiconductor colloidal quantum dots (QDs) are electronically quantized systems with promising applications in optoelectronic devices[1]. A key aspect of such…


Membrane-integrated Superconducting Nanowire Single-photon Detectors
  • Superconducting nanowire single-photon detectors (SNSPDs)[1] based on niobium nitride (NbN) nanowires have shown high speed (< 3ns dead time[2] )…


Interface Engineering of Graphene for Universal Applications as Both Anode and Cathode in Organic Photovoltaics
  • The high transparency of graphene[1], together with its good electrical conductivity[2] and mechanical robustness[3], enable its use as transparent electrodes…


Large-scale Nanophotonic Phased Array
  • Electromagnetic phased arrays at radio frequencies (RFs) are well known and have enabled applications from communications to radar, broadcasting, and…


Rule-based Directed Self-assembly of Circuit-like Block copolymer Patterns
  • Templated self-assembly of block copolymers using topographic templates is attractive because it can generate dense nanoscale patterns over a large…


Non-Wetting Droplets on Superheated Textured Hydrophilic Surfaces
  • Engineered surfaces have received significant interest for a wide range of applications including microfluidics, drag reduction, self-cleaning, water harvesting, anti-corrosion,…


Wide-field Multispectral Super-resolution Imaging Using Spin-dependent Fluorescence in Nanodiamonds
  • Recent advances in fluorescence microscopy have enabled spatial resolution below the diffraction limit by localizing multiple temporally or spectrally distinguishable…


Improving Water Desalination Capabilities through the Use of Engineered Nanostructured Materials
  • Manipulation and control of transport at nanometer length scales offers new opportunities to enhance the performance of water desalination systems[1]….


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…