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Gallium Nitride, in the form of epitaxial HEMT transistors on silicon carbide substrates is now almost universally acknowledged as the replacement for silicon bipolar, power MOSFET, high power devices in the RF, microwave, and mmW arenas. This is particularly true for GaN-on-SiC based MMIC's which enable state-of-the-art high frequency performance and bandwidth to be extended into Ku-Band and Ka-Band...
This paper presents piezoresistive nanowires based pressure sensor with a novel and low-cost nanowire fabrication technique. Silicon nanowire sensing element (width<100 nm) is chosen because of their higher piezoresistive coefficient compared to bulk silicon and integrated into MEMS diaphragm to measure pressure up to 2 bar. The novelty of the proposed process lies in making nanowires with controllable...
Scanning Thermal Microscopy (SThM) is a key technique for thermophysical property measurements with a submicrometric spatial resolution. The European project QUANTIHEAT “Quantitative scanning probe microscopy techniques for heat transfer management in nanomaterials and nanodevices” is centred around this technique. Project aims at solving the problems of thermal metrology at the nanoscale by delivering...
In many cases it is important to measure the temperature and the thermal conductivity of an object by contact. Examples include sensors in robot hands, and sensors to measure material properties during manufacturing. In this paper, we demonstrate the ability to measure the time-of-flight (TOF) as a function of time after mechanical contact to the transducer, and show that the rate of TOF change can...
Heat conduction in silicon can be effectively reduced by means of periodic patterning of free-standing membranes. In this work we show a straightforward method for fabrication of free-standing phononic crystals based on thin silicon membranes. We use the contactless two-laser Raman thermometry method to measure thermal conductivity of the hexagonal phononic crystals. The aim of the study is to understand...
Graphene, one-atom-thick carbon film, has excellent and unique electrical properties, along with good flexibility. It is therefore expected to be applied to various electronic devices, such as transistors, interconnects, transparent electrodes, sensors, and new-principle devices. In this paper, we briefly review some of the applications. We also describe applications we have been working on, which...
We report the results of investigations of thin films of the composite based on the semiconducting polymer polyfluorene and graphene oxide particles with different content of the graphene oxide by terahertz time-domain spectroscopy.
A finite element model which contains one sixth of the IGBT module based on a real test chip of IGBT module is established to investigate the temperature and stress distribution of different shape bonding wire. The finite element (FE) analysis which coupled electro-thermal and thermal-mechanical are conducted using commercial software ABAQUS. The thermal performance and stress distribution of IGBT...
Thermal-stress co-simulated of a mm-wave T/R system in package(SiP) for Ka-band radar, was performed using ANSYS Workbench code. the T/R SiP is base on four layer high-resistivity silicon substrates which is stacked layer by layer, thermal flux generated from chips propagated to aluminium alloy cavity through silicon substractes and a molybdenum-copper plate. In simulation, the thermal power of the...
The hybrid material of PI (with SiC whisker, SiC particle, AlN particle, and diamond particle) is proposed to satisfy the requirement of higher thermal conductivity for the high density package system. The thermal conductivity of the proposed hybrid materials with a moderate amount of doping can be improved to about 6–12 times. The hybrid films are fabricated by mechanical ball-milling process, high...
The unique monoatomic structure of graphene makes it as an enticing material to be used in sensitive detection of analytes in biosensing applications. Implementation of graphene as a conducting channel in graphene based field effect transistor (GFET) allows ultrasensitive detection of analytes in a targeted sample. Herein, we have investigated the transfer characteristics of GFET for biosensing applications...
In a compact power electronics systems such as converters, thermal interaction between components is inevitable. Traditional RC lumped modelling method does not take that into account and this would cause inaccuracy in the predicted temperature in the components of the systems. In this work, numerical simulation have been used to obtain detailed temperature distribution in power devices and the parameters...
A method of measuring the thermal conductance and the heat capacity of a nanowire is presented. The nanowire is suspended in vacuum to ensure the thermal isolation, and the resistance is measured with respect to the square of the current to obtain the thermal conductance in the length direction. The heat capacity is evaluated by the frequency response of the 3f component of the voltage across the...
We investigate the effect of diameter and doping condition on thermal conductivity of vertical nanowires. Vertical silicon nanowire array/spin-on glass (SOG) composite films were fabricated using CMOS technology to extract thermal conductivity of vertical nanowire. The thermal conductivity is reduced by about 27% when diameter is decreased from 350 nm to 190 nm. In addition, boron doped and phosphorus...
We demonstrate electron transport characteristics of newly synthesized NiO nanoparticles on p-type Si substrate using scanning tunneling microscopy (STM). The resistivity and conductivity were determined to be 1.7×104 Ω.cm and 5.8×10−5 Ω.cm for Ni(OH)2 and 3.1×105 Ω.cm and 3.2×10−6 Ω.cm for NiO, respectively. Additionally, we also exemplify the characteristics features of graphene flakes with NiO...
Plasmonic nanostructures serve to enhance light-matter interaction at the nanoscale. Metallic nanoantennas in conjunction with group-IV-devices can be used to enhance the efficiency of scaled-down devices [1] or to develop concepts for integrated biosensing [2]. However, for applications at wavelengths in the near-IR and mid-IR range, metals suffer from high Drude damping as a result of the high charge...
Self-heating effects (SHEs) were studied on the vertical nanoplate-shaped gate-all-around (GAA) FETs (vNPFETs) as a target of 5nm node technology. The thermal properties are compared between face-up and face-down configuration. Decreasing the channel width is vulnerable to both configurations in terms of SHEs due to the reduced area of heat dissipation. It is well known that the SHE is alleviated...
Quasi-monocrystalline germanium (QMC Ge) is investigated for potential applications in high-efficiency, low-cost multi-junction solar cell design. The morphology and electrical resistivity of QMC Ge is characterized and computer simulations of MJSCs on Si substrates using QMC Ge interface layer are developed.
We investigate a novel Ti Chemical Vapor Deposition (CVD Ti) technique for source/drain and trench contact silicidation. This work is a first demonstration of a highly selective, superconformal Ti process that exhibits a low p-type CVD Ti/SiGe:B contact resistivity (pc) down to 2.1×10−9 Ω.cm2 (a 40% reduction vs. PVD Ti), matching the lowest published values [1-5]. A competitive n-type CVD Ti/Si:P...
The control of diamond nucleation and the early stages of diamond growth are essential for control of the diamond properties that are sensitive to or directly depend on the film anisotropy, grain size, and microscopic voids in the film. This phenomenon particularly affects the thermal conductivity of thin diamond films. Measuring the thermal conductivity/thermal diffusivity of material like diamond...
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