B. L. Crossley, M. Kossler, P.J. Collins, R. A. Coutu Jr., and L. A. Starman
Air Force Institute of Technology, Wright-Patterson AFB, Ohio, USA
Carbon nanotubes (CNTs) have been proven experimentally to be well suited for field emission applications. An optimized triode configured CNT field emission array is developed using the COMSOL Multiphysics Electrostatics Application to adjust five key physical dimensions to investigate the effects on the enhanced electric field at the CNT emitter tips. The five dimensions studied are CNT spacing, ...
A. Traidia, and F. Roger
AREVA NP, Technical Center, Saint Marcel, France
ENSTA Paristech, Paris, France
Using COMSOL Multiphysics, a finite element model is introduced in this paper to describe the couplings between the welding arc and the weld pool dynamic in pulsed gas tungsten arc welding. The cathode, arc-plasma and melting anode regions are taken into account. The unified time-dependent model describes the heat transfer, fluid flow and electromagnetic fields in the three regions. The ...
Northwestern University, Evanston, IL, USA
Dye sensitized solar cells (DSSCs) have received tremendous attention as alternative photon harvesting devices. While the sintered TiO2 nanoparticle network attached with dye molecules achieves efficient photon absorption, the electrons have to diffuse through the long TiO2 network to reach the contact, resulting in a high electron density and thus increased recombination. Extensive research ...
TEL Technology Center, America, LLC
Hydrogen plasma is typically used in the semiconductor industry for materials processing, surface preparation and cleaning of silicon wafers and thin films. In this contribution, we developed a 2D/3D plasma fluid model as described by the set of the species and energy balance equations in a generic semiconductor tool chamber with remote Inductively Coupled Plasma (ICP) source. Background ...
S. Prabhakar and J. Raynolds
College of NanoScale Science and Engineering, University at Albany, Albany, NY, USA
Non-charge-based logic is the notion that an electron can be trapped and its spin manipulated through application of gate voltages. Numerical simulations of Spin Single Electron Transistors (SSET) at University at Albany, aimed at practical development of post-CMOS concepts and devices is presented. We use COMSOL based multiphysics finite element simulation strategy to solve the ...
Vanderbilt University, Nashville, TN, USA
Carbon nanotube FETs are generating much interest in the nanoscale electronics area. Typically subthreshold behavior in these devices has been modeled using the Laplace equation. Above threshold behavior uses self-consistent solutions to the Poisson and continuity equations. Accurate modeling of Carbon nanotube FETs needs to include quantum effects such as tunneling. Owing to the coupled nature ...
Fluid-Structure Interaction Modeling for an Optimized Design of a Piezoelectric Energy Harvesting MEMS Generator
I. Kuehne, A. van der Linden, J. Seidel, M. Schreiter, L. Fromme, and A. Frey
Siemens AG, Corporate Research & Technologies, Munich, Germany
Comsol Multiphysics GmbH, Göttingen, Germany
This paper reports the design of a piezoelectric energy harvesting micro generator for an energy autonomous tire pressure monitoring wireless sensor node. For our design we use a piezoelectric MEMS generator approach without additional mass. The intrinsic mass of the cantilever is in the microgram region and the resulting acceleration forces are very small. The generator has a triangular ...
S.D. Ekpe, F. Jimenez, and S.K. Dew
University of Alberta, Edmonton
This work is focused on the coupling of a Monte Carlo code with COMSOL Multiphysics conduction/convection, and electrostatic modules in solving fluid-Poisson model for the plasma properties for a practical DC magnetron low pressure plasma discharge. The magnetostatic module was used in calculating the required magnetic field.
V. Mathur1, J. Li1, J. Therrien2, and W. D. Goodhue1
1Photonics Center, Department of Physics and Applied Physics, University of Massachusetts, Lowell, MA, USA
2Department of Electrical Engineering, University of Massachusetts, Lowell, MA, USA
Several methods have been demonstrated for depositing nanotubes on microstructures, ranging from using an atomic force microscope (AFM) tip for single tube manipulation to chemically pre-patterning the substrate. However, these techniques have a very low yield and poor reproducibility. Sorting techniques involving filtration and ultrasonication face similar issues. Recently, electric field ...
F. Jimenez, S. D. Ekpe, and S. K. Dew
Department of Electrical and Computer Engineering, University of Alberta, Edmonton, AB, USA
The plasma characteristics of a low pressure plasma discharge are dependent on the process conditions in a complicated manner. In order to understand this dependence, a comprehensive model, which takes into consideration the effects of the E x B field and gas heating on the transport of plasma particles, is required.In this work, a Monte Carlo - fluid - Poisson hybrid model is used in describing ...