category » Materials

Templated Self-Assembly Using Physical Templates with Majority-block Brushes
  • In this study, we demonstrated a high-resolution method for doubling the spatial frequency of lines and dots of structures defined…


Scanning-neon and Helium-ion-beam Lithography
  • A commercially-available scanning-helium-ion microscope of high source brightness [1] has been modified for operation with neon gas. This neon system…


Ternary Mixtures for Improved Performance in P3HT/PCBM Bulk Heterojunction Solar Cells
  • Photovoltaic cells containing nanoscale phase separated mixtures of a poly(thiophene) donor and a fullerene acceptor in the active layer have…


Exciton Delocalization and Disorder in J-aggregates
  • J-aggregates, which are self-assembling molecular nanostructures [1] , have unique optical properties resulting from coherent coupling of their molecular components….


Integration of Cobalt-based Catalyst with Silicon Photoanodes to Achieve Photo-assisted Water Oxidation
  • Transformation of solar energy into chemical fuels is an attractive energy conversion transformation to address the intermittency of power generation…


Nano-scale Metal Contacts for Future III-V CMOS
  • The scaling of MOSFETs in recent years has pushed the gate length down to less than 20 nanometers.  Further gate…


Fabrication of GaAs-on-Insulator via Low-temperature Wafer Bonding and Sacrificial Etching of Ge by XeF2
  • Front-end integration of III-V compound semiconductor devices with Si metal-oxide-semiconductor (MOS) technology requires the development of commercially viable engineered substrates…


III-V and IV Semiconductors for Thermoelectric and Thermophotovoltaic Applications
  • We are developing materials for thermoelectric and thermophotovoltaics applications.  Our objective is to develop III-V and/or IV superlattices with low…


Platform for Monolithic Integration of III-V Devices with Si CMOS
  • Monolithic integration of III-V devices with Si CMOS technology allows us to combine the unique capabilities of III-V devices with…


High-efficiency, Low-cost Photovoltaics Using III-V on Silicon Tandem Cells
  • Photovoltaics and sustainability have received a lot of attention lately. We seek a tandem photovoltaic device using silicon as both…


Single-Chamber Deposition of Multilayer Barriers
  • Protective coatings that prevent the ingress of water into electronic devices fabricated on flexible plastic substrates are essential to extend…


Implantable Microworm Optode Sensors
  • The development of biosensors is considered a focal subject for clinical applications. The main efforts are being addressed towards in-vivo…


Synthesis of One- to Two-layer Hexagonal Boron Nitride Using Chemical Vapor Deposition
  • Hexagonal boron nitride (hBN) is very attractive for a variety of applications, particularly as deep ultraviolet emitter, transparent membrane, dielectric…


Wearable Thermoelectric Generators
  • There exists great interest in the utilization of the human body as a possible power supply for running such electronics…


Self-assembled Hetero-structured Oxides
  • We are studying BiFeO3/CoFe2O4 oxide composite thin films, which have the remarkable characteristic of self-assembling into vertical nanostructures during their…


Templated Self-assembly of Block Copolymers for Nanolithography
  • Self-organized macromolecular materials can provide an alternative pathway to conventional lithography for the fabrication of devices on the nanometer scale….


Templated Dewetting of Metal Films
  • Magnetic metal nanoparticle arrays have attracted considerable interest for applications in patterned magnetic recording media as well as catalyst arrays…


Templated Solid-State Dewetting for Pattern Formation
  • Vapor deposited thin films are rarely stable, so that when they are heated to temperatures at which atomic diffusivities are…


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


Ionic Conduction Studies in TlBr Radiation Detector Material
  • 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…


Microsphere Templated Nanostructured Gas Sensors
  • Gas sensors are essential in the monitoring, control, and reduction of harmful emissions in the environment [1] .  Conductometric gas…


High-flux Pool Boiling with Micro-engineered Surfaces
  • The mechanism of critical heat flux (CHF) is commonly attributed to two limits during boiling behavior: 1) the hydrodynamic limit…


Single-Photon Detection with Ultranarrow Superconducting Nanowires
  • Superconducting nanowire single-photon detectors (SNSPDs) [1] perform single-photon counting in the near‑infrared with outstanding performance. The main limitations of standard…


Templated Self-assembly of Block Copolymer for High Throughput Sub-10-nm Fabrication
  • Templated self-assembly of block copolymer, based on topographic templates defined by electron-beam lithography (EBL), is an attractive candidate for next…


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


Triplet Exciton Dynamics in Tetracene Versus Rubrene Crystals
  • Exciton transport is universal in every kind of organic optoelectronic devices – including organic light-emitting diodes (OLEDs) and organic solar…


A Novel Sublimable Mask Lift-off Method for Patterning Thin Films of Organic Semiconductors
  • Photolithography’s accuracy and scalability have made it the method for sub-micron-scale definition of single-crystal semiconductor devices for over half a…