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The material and interface engineering of magnetic tunnel junctions (MTJ) is the key for the future of spin transfer torque based random access memories (STT-RAM).
A comparative investigation of the reliability of 60Coγ ray irradiation on bulk-Si substrate and SOI substrate double polysilicon self-aligned (DPSA) NPN bipolar transistors is presented. Bulk silicon based DPSA NPN transistors show severe current gain degradation at low injection level, and a monotonic increase in current gain degradation with decreasing Emitter-Base (E-B) voltage is observed. SOI...
Magnetic thin films, when applied in high-frequency devices, are required to have relatively high real (μ') and low imaginary (μ") permeability, and the ferromagnetic resonance (FMR) frequency need to be higher than the working frequency of the devices. In experiment, the methods including oblique deposition, field annealing, and interfacial exchange coupling, have been often used to increase...
The development of new permanent magnet materials is of particularly importance since the high-performance Nd2Fe14B are expensive due to the limited reserves of rare earth Nd, Tb, Dy on the earth. In the past several years, much attention has been attracted to the permanent magnet without rare earth[1], such as Zr2Co11, HfCo7 and Mn-based alloys, and excellent performance has been observed. For example,...
Solar energy is indispensable and needs to be developed to meet the future energy demands of the world. One of the impediments to this technology is the low efficiency of the solar module, the glass shield being one of the reasons. At present, solar modules suffer from 4% transmission loss at the air/glass interface (at normal incidence) which increases with an increase in the accumulation of dust...
Incident irradiation on solar modules experiences reflection at the outermost air-glass interface which reduces overall power conversion efficiency, especially when the sun is near the horizon in fixed-mount modules without active tracking. Here, we present a non-lithographic fabrication process for creating vertical and tilted nanostructures directly in the packaging glass of solar modules. We investigate...
For many harsh environment, high reliability product applications such as automotive, military and avionics, the solder joint fatigue behaviour of electronic packages subjected to accelerated thermal cycling is frequently used as an estimate of ‘in field’ reliability.
In this paper, an H-plane horn antenna is designed and studied in substrate integrated waveguide (SIW) structures. The SIW horn input reflection coefficient and output radiation at 60 GHz have been simulated for a GaAs substrate of 100 um and 300 um thick, respectively. Microstrip line to SIW transition is also designed for possibly realization of the antenna into commercial GaAs MMIC circuit board.
We report the design, fabrication and testing of an optimized 6-stage planar thermoelectric (TE) micro cooler producing a DeltaT = 22.3degC at a power consumption of 26 mW, the best performance reported to date for a thermoelectric microcooler. This microcooler has a compact chip-scale design, and utilizes Bi2Te3 and Sb2Te3 thermoelectric thin films deposited on thermally isolating silicon oxide bridges...
This research describes the truncated micro-pyramid reflective cavity for light emitting diodes (LEDs) packaging and increasing LEDs' heat dissipation. Research went through different microstructure profiles related to thermal effect in LEDs' packaging. Microstructures based on the silicon bulk micromachining provide unique truncated micro-pyramid reflective cavity geometry for LEDs assembly. Etching...
Nickel germanides was formed on crystalline n-Ge (100) substrate by conventional RTA annealing at temperatures ranging from 300??C to 600??C. The XRD result reveals that only the NiGe phase is observed during this process temperature range. The orthorhombic structure of NiGe also induces epitaxial tensile strain on Ge substrate (i.e., NiGe itself is compressively strained) due to the difference in...
In this paper we propose a “build-up” approach for surface texturing on solar cells. By coating solar cells with a monolayer of dielectric microparticles, followed by a dielectric film with a thickness less than the height of the particles, a surface texture can be formed on almost any type of solar cells. More importantly, this texture is prepared by solution coatings, ensuring its low cost. Dielectric...
This paper describes the development of metallic bipolar plate fabrication using micro-electroforming process for mini-DMFC (direct methanol fuel cell) stacks. Ultraviolet (UV) lithography was used to define micro-fluidic channels using a photomask and exposure process. Micro-fluidic channels mold with 300 mum thick and 500 mum wide were firstly fabricated in a negative photoresist onto a stainless...
Epitaxial c-axis oriented BiFeO3 (BFO) thin films were deposited on conductive SrRuO3 (SRO) on (001) SrTiO3 substrates by pulsed laser deposition. A Pt/BFO/SRO capacitor was constructed by depositing a top Pt electrode. The leakage current density vs. electric field characteristics were investigated from 80 to 350 K. It was found that the leakage mechanisms were a strong function of temperature and...
Two-phase nanocomposite heteroepitaxial films with vertical microstructures hold great promise for various (multi)functional (e.g. multiferroic) electronic device applications. With the aim of creating addressable arrays, it is necesary to form spontaneously ordered structures over large areas. However, such structures have not, so far, been demonstrated. We have recently shown remarkable spontaneously...
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