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Light-emitting diode (LED) technology has been rapidly developing due to high energy efficiency and longer lifetimes of LED luminaires. One of the main challenges in designing LED components is to manage the inter-twined relation between thermal, electrical, and optical performances. These dependencies are required to be well understood in order to operate LEDs efficiently and have accurate performance...
CMOS-compatible GaN-on-silicon technology with excellent D-mode MISHFET performance is realized. A low specific contact resistance Rc (0.35 Ω-mm) is achieved by Au-free process. MIS-HFET with a gate-drain distance (LGD) of 15 μm exhibits a large breakdown voltage (BV) (980 V with grounded substrate) and a low specific on-resistance (R ON,sp) (1.45 mΩ-cm2). The importance of epitaxial quality in a...
We report on n-channel tunneling field-effect transistors (TFET) with a tensile strained Si channel and a compressively strained Si0.5Ge0.5 source. The device shows good performance with an average subthreshold swing S of 80mV/dec over a drain current range of more than 3 orders of magnitude. We observed that an applied back-gate bias increases the on-current by a factor of 1.6, and improves the off-current...
In this work, we present the development of a Pt/graphene/SiC device for hydrogen gas sensing. A single layer of graphene was deposited on 6H-SiC via chemical vapor deposition. The presence of graphene C-C bonds was observed via X-ray photoelectron spectroscopy analysis. Current-voltage characteristics of the device were measured at the presence of hydrogen at different temperatures, from 25°C to...
In this paper, we report the development of a novel Pt/MoO3 nano-flower/SiC Schottky diode based device for hydrogen gas sensing applications. The MoO3 nanostructured thin films were deposited on SiC substrates via thermal evaporation. Morphological characterization of the nanostructured MoO3 by scanning electron microscopy revealed randomly orientated thin nanoplatelets in a densely packed formation...
In this paper, we present gas sensing properties of Pt/graphene-like nano-sheets towards hydrogen gas. The graphene-like nano-sheets were produced via the reduction of spray-coated graphite oxide deposited on SiC substrates by hydrazine vapor. Structural and morphological characterizations of the graphene sheets were analyzed by scanning electron and atomic force microscopy. Current-voltage and dynamic...
In polyimide films, there occur breaks in the reciprocal-temperature dependence of the log-electrical conductivities. It indicates that the multiple transitions and relaxations of the polyimide films are reflected in the above mentioned relationship. This presents us the possibility to determine the rule of variations of the electrical conductivities of the polymer with temperatures and is of interest...
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