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This work focuses on the luminescent materials Si3N4:Ce3+ with magnesium oxide additive prepared by the solid-state reaction method. The detailed phase formation was investigated based on X-ray diffraction profiles. The photoluminescence (PL) and photoluminescence excitation (PLE) spectra, the decay lifetime depend on the concentration of doped-Ce3+ ion and MgO additive were investigated. The emission...
Herein we report the field effect properties of lithographically fabricated FET with graphene quantum dots (GQDs) as channel. GQDs are synthesized via an electrochemical avenue using multiwall carbon nanotubes. As-prepared dots of 4.5±0.55 nm average diameter are found to be p-type in nature under ambient conditions. Field effect measurements yield hole mobility of 0.01 cm2 V−1s−1 and Ion/Ioff ratio...
Temperature distribution of microheaters during electromigration (EM) was observed by near-infrared (NIR) charge coupled device (CCD) imaging system. The temperature of the hot spot, located at the tip of the microheater, was well controlled with varying the applied voltage. Microheaters were broken during EM processes, and breakdown region clearly corresponded to the position of the hot spot. These...
In this paper, we introduce an electro-chemical doping method of amorphous selenium (a-Se) using NaClaq. Recently, an a-Se photovoltaic device fabricated using this method [1], has been announced and opened up the potential of a new impurity doping method. This study will further explore its possibilities by doping chlorine (Cl) and sodium (Na) and aim to fabricate a p-n junction by reversing the...
The work function and surface energy of aluminum with different orientations are investigated by employing the DFT simulation. We mainly focus on two situations: pure aluminum surface and aluminum surface with impurities. The numerical results indicate that the work function of Al (100) is larger than Al (110). With the introduction of the impurities (carbon atoms), the work function increases because...
Photoluminescent quantum dots (QDs) have been extensively used in biomedical research for sensing, imaging and disease therapy. In this contribution, we demonstrate the use of bioconjugated cadmium telluride (CdTe) QDs as fluorescent optical probes for targeted in vitro cell imaging. A co-surfactant system of mercaptopropionic acid (MPA) and Cysteine (Cys) mixture were introduced for the synthesis...
In-Ga-Zn-O (IGZO) was widely applied in the substrate of TFT to replace a-Si in recent year. In this study, IGZO layer with thickness of 70 nm is first proposed as a pH sensing membrane directly on P-type Si substrate acting as an extended gate of conventional extended-gate field-effect Transistor (EGFET). Material criteria of extended gate electrode are low resistance and high capacitance. Therefore,...
Fin-FET is so expected because it protects Ioff current from outrageously leaky as the channel length gets shorten continuously. It thus keeps the threshold voltage and the swing from rolling-up. Those good characteristics are manifested by the fully depleted region and the lack of leaky body as the gate is biased. In this study, the fin-thickness effect is to be noticeably discussed. The correlated...
The leakage current is suppressed on 3-D structural fin-like channels of FinFET as the sizes of devices get substantially shrunk. The devices with channel width/length (0.12μm/ 0.10μm) are focused on and the baseline device is taken to be 15KeV phosphorous ions (the precursor PH3) for N-well Vt implant and heavily doped poly-silicon for the gate. One is thus intrigued in what if the Vt implant energy...
Strained Engineering including both global and local strains effectively enhances the mobility of carriers, in which global strains are generated by the mismatching of lattice constants at the junction of Si and Si0.775Ge0.225 and local strains are aroused by Source/Drain refilled with SiGe. In this paper, junction breakdown voltage, punch-through voltage, and the variation of threshold voltages are...
In this study, we attempt to enhance the electrical conductivity of polyimide (PI) by non-covalently modified multiwall carbon nanotubes (MWNTs). The multiwall carbon nanotubes were first oxidized (o-CNT) and modified with nitric acid (n-CNT). The o-CNT and n-CNT were then modified with anionie surfactant (Sodium dodecylbenzene sulfonate) (SDBS) to improve their dispersion in the PI matrix. We also...
In this study, a two-dimension array of InGaAs photodiode with 0.9∼1.7nm absorption wavelength was presented. By using the characteristic of wide wavelength range in InGaAs material, we designed several active regions in our novel devices for inducing expected photocurrent. While the distances between light source and these several equal-area active regions increases, we found the current generated...
The GZO thin films of the thickness about 200∼250nm were deposited on the glass which used as a pH sensor head based on the extended-gate field-effect transistor (EGFET) by r. f. sputtering system in this study. The pH sensing characteristics of the GZO/glass EGFET sensing structure were investigated and a semiconductor parameter analyzer (Keithley 4200) was used to measure the drain-source current...
In this study, the Al-doped ZnO (AZO) nanorods were synthesized on silicon substrate by the hydrothermal process. The SiO2/silicon substrate was submerged horizontally in 0.06M mixture solution of zinc nitrate hexahydrate (Zn(NO3)2·6H2O), diethylenetriamine (DETA), and doped the solution of aluminium nitrate, nonahydrate (Al(NO3)3·9H2O) at about 90°C for 4h. It has been shown that the ZnO nanorods...
We report on the effects of post-annealing on ZnO nanorods array using optical second harmonic generation (SHG). The high-quality and nearly vertically aligned ZnO nanorod arrays were deposited on ZnO-seeded glass substrates by aqueous solution method. The SHG result indicated the transformation of oxygen deficiency on ZnO nanorods surface after post-annealing treatment process. The chemical composition...
In this paper, we have presented the design and invention of an electronic nose (E-nose) that can work and analyze the results via a network system such as LAN or WiFi. The MWCNTs/polymer composites were used as a gas sensor array. The constant current circuit was newly designed for gas sensor measurement. The fabricated E-nose showed a high performance for indoor air monitoring with very low noise.
We demonstrate experimentally the improvement of the external quantum efficiency (EQE) and current-matching of the triple-junction GaAs-based solar cell using periodic-patterns incorporated with random nano-sized indium-nanoparticles plasmonics. The average EQE decreased of −9.8% in top-cell and increased of +2.4% in middle-cell were obtained as the solar cell with periodic-patterns random nano-size...
Arrays of horizontally suspended carbon nanotube (HSCNT) bundles were grown from selected silicon trench sidewalls with help of micromachining technologies. The key process is the patterning of an iron (Fe) catalyst layer onto selected silicon trench sidewalls through a shadow mask placed on top of silicon trenches by the tilted electron beam evaporation technique. These HSCNTs bundle arrays are promising...
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