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Electric-field control of spin states has been studied in InGaAs-based coupled nanostructures composed of quantum dots (QDs) and wells (QWs), where electron spins optically excited in the QW can be transferred into the QDs via tunneling depending on the strength of applied electric field. The photoluminescence (PL) intensity in the QDs and the circular polarization, reflecting the electron-spin states...
Carbon nanodots (C-dots) with broad emissions when excitation wavelength changes in a large region are suitable for a broad range of applications, including optical down-conversion devices, bioimaging, and biosensors by selecting different excitation wavelengths without changing their structure. Herein, C-dots exhibiting broad photoluminescence from blue to green regions with strong excitation-dependence...
This paper presents two circuits for implementing the restore operation of a non-volatile (NV) memory cell in which data from a programmable metallization cell (PMC) can be copied (restored) into a static random access memory (SRAM). In the first proposed design, a transmission gate is added to each row of cells of the memory array in which a concurrent error detection (CED) circuit is also present...
A ZnO-nanowire photodetector was prepared using three-dimensional through silicon via (TSV) technology. The diameter and depth of the Si via were about 80 µm and 175 µm, respectively. Cu uniformly filled in each TSV, whose average resistance was about 1 mΩ. Upon illumination with UV light (= 330 nm), it was found that measured responsivities is 7.38×10−3 A/W for the 3D TSV ZnO nanowire photodetector...
We study transient photoluminescence (PL) in In0.2Ga0.8N nano-disks (NDs) fabricated from a 2 or 3 nm-thick quantum well (QW) by damage-free neutral-beam etching utilizing bio-nano-engineered etching templates. A lateral averaged diameter of the ND was controlled to be 9 nm with a high sheet-density up to 2.6×1011 cm−2. Transient PL in the NDs was measured as a function of temperature and compared...
We introduce a state-of-the-art self-aligned contact (SAC) process and patterning process developed by new patterning technology using Atomic Layer Etch (ALE) and Atomic Layer Deposition towards 5/7nm generation.
In this paper, we show a low temperature neutral beam oxidation process to obtain a high quality metallic oxide film. After irradiation of a Ta metal film with a neutral oxygen beam, a nm-thick Ta2O5 film with a high film density was obtained, and a fabricated Cu/Ta2O5/Pt resistive memory (ReRAM) structure showed a bipolar resistive switching characteristic. In addition, after the deposition of a...
This paper presents a concept of a micro thermal sensor to be used for defect inspection of a smoothly-finished surface such as a bare wafer or a hard disk. In the proposed concept, existences of the defects on a measurement surface will be detected by scanning the surface with the micro thermal sensor, which is utilized to detect the variation of the thermal flow in-between the sensor surface and...
The remarkable properties of two-dimensional materials have generated great enthusiasm among researchers. Very recently, MoS2, the representative of transition metal dichalcogenides, has triggered increasing attention and hold huge potential for many applications. Although the tribological properties of MoS2 has been studied for decades, the atomic-scale motion between tip and MoS2 surface is quite...
Atmospheric pressure plasma-enhanced chemical vapor deposition (AP-PECVD) was applied for the fabrication of amorphous indium gallium zinc oxide thin-film transistors (a-IGZO TFTs). In this work, a-IGZO TFTs fabricated by AP-PECVD technique were firstly treated by post deposition of in-situ Ar/H2 plasma with atmospheric pressure plasma Jet (APPJ). Compared to without plasma treatment, samples with...
We conducted an experiment on the fabrication of fluidic devices for producing fine droplets. In our proposed method, multiple channels were fabricated by using a focused ion beam (FIB) system. The minimum feature top width was found to be approximately 56 nm. When both the target width and depth of one channel were set to 500 nm, the resultant top width was 750–780 nm, the bottom width was 250–320...
We have investigated magnetic, electric and thermal response using an artificial magneto-electric multilayer. By the application of magnetic field, a capacitance and resistance value changed. This behavior was more likely due to magnetic coupling and tunneling effect. It is also revealed that the tunneling effect is responsible for thermal response. These results indicate a possibility of new type...
In order to understand the behavior of the crystal lattice deformation induced by the interstitial oxygen formation in La2(Ni0.9M0.1)O4+δ (M = Fe, Co, Cu), thermogravimetry, coulometric titration, and high temperature X-ray diffraction measurements were carried out in the temperature range between 873 to 1173 K and the P(O2) range between 10−24 to 1 bar. Oxygen content variation under wide range of...
Graphene's extraordinary electrical, electrochemical and structural property holds great promise for biological sensing applications. In most graphene based sensing studies, the changes in conductance are widely employed as a method for detection. Here, we propose the graphene thermoelectric property, such as the thermo power profile, can also be used for sensing purposes. We conducted a first principle...
In the automotive industry, the control of friction and wear by the lubricant in thermal engines and gear box is one of the most important issues for fuel economy. Therefore, it is needed to better understand the nature of tribochemical reactions with specific materials and competition of additives in the formulated lubricant in order to design and develop better lubricants that also address environmental...
The sol-gel method and supercritical fluids drying have been carried out for the successfully prepared of silica-titania aerogel monoliths. The obtained aerogel exhibits high properties with a density of 0.135 g/cm3. We characterized the microstructure and physical characteristic of silica-titania aerogel by the specific surface area, SEM, Hot-disk and FTIR. From the results shown that sample possess...
In this study, we have proposed an ingestible sensor platform utilizing gastric acid battery for daily healthcare. This platform has a fundamental application to precisely measure core body temperature as one of the most useful vital signs for health check. It also has the expandability to add various biosensors such as pH, pressure sensors etc‥ The architecture without a conventional battery is essential...
Series coupled triple quantum dots (TQDs) have been studied as an important element of quantum computers. It is needed to fabricate QD array connected in series with a compact structure to scale up the quantum bits. To develop quantum bits based on the TQDs, evaluation of the charge stability diagram is needed. However, since the center gate usually couples to all dots in the compact TQDs, it is difficult...
The harvest of heat energy using a thermoelectric (TE) effect is one of the potential methods for body area network power source. This paper demonstrates a new approach of a chemical electroplating deposition process to fabricate a self-endurance flexible TE generator without top and bottom sustaining substrate. According to that, an idea of horizontal Y type TE cells instead of column π type structure...
Metal oxides have been shown to have wide ranging material, physical and chemical properties while 2D materials has it unique two-dimensional planar structure and in this review, we show that a hybrid composite utilizing carbon nanotubes are used as a base template, forming a hybrid core-shell type of nanostructure, effectively enhances and extends the range of applications. There are two unique properties...
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