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This paper reports complete Capacitance-Voltage (CV) characterization of InAsySb1−y Quantum Well Field Effect Transistor (QWFET) along with an analysis of ballistic transport performance. 1-D coupled Schrodinger-Poisson equations are solved for electrostatic performance analysis of QWFET considering wave function penetration and strain effects. Dependence of CV characteristics on some important process...
Ordered nanostructures of conventional plasmonic metals (Ag, Au etc.) in a dielectric matrix are candidate materials for fabrication of metamaterials. Control over the dimensions of these building blocks offers tunability in the metamaterial design. To that effect we demonstrated the large area fabrication of poly(styrene-b-4-vinyl pyridine) (PS-b-P4VP) diblock copolymer films wherein the self assembly...
This paper reports the synthesis of Ag-doped SiO2/TiO2 hybrid optical sensitive thin films deposited by sol-gel spin coating technique. The structural properties of thin films were characterized by XRD, TEM and EDX. The optical absorption of the films in visible region measured by UV-VIS can be enhanced by Ag nanoparticles due to surface plasmon resonance effect. Photosensitive film can be utilized...
Optical radiation efficiency is the ratio of scattering cross section to extinction cross section. Optical radiation efficiency has been calculated, using classical electrostatics, for spherical nanoparticles of Ag, Au, Cu, Co, Cr, Ni, Pd, Pt, Sn, and Ti. The particle diameter was varied and calculated for the wavelengths in the range of 400–1200nm. The change in radiation efficiency in glass medium...
This paper presents a highly sensitive capacitive pressure sensor composed of a polymer dielectric film with nano-needle structures made from the breath figure method. The pressure sensitivity of the sensor reached 1.76 kPa−1 in the low pressure range (<1 kPa), which is comparable to the sensitivity of human skin. The pressure sensors were integrated with inkjet-printed organic thin film transistors...
In this paper, a novel design for far infrared resonant cavity enhanced quantum dot photo-detector (RCE QDP) based on bound-to-bound intervalence subband transitions in self assembled InAs/GaAs quantum dots (QDs) is presented. The device structure consists of QDs active layers inserted between two distributed Bragg reflectors (DBRs). Quantum efficiency is calculated as a function of wavelength for...
Enhanced photoelectric conversion is demonstrated in a Cu(In, Ga)Se2 solar cell with the polystyrene (PS) nanospheres, which is one of the simplest and the fastest methods to build a two-dimensional closely packed periodic structure. Owing to the scattering of the PS nanospheres, the light path length can be increased when compared to a bare CIGS solar cell without PS nanospheres on surface. The dimensions...
In this study, we proposed a new sensing configuration for enhancing the surface plasmon resonance (SPR) based on graphene and gold nanorods (Au NRs). Both analytical modeling based on Fresnel equations and numerical analyses through finite element method (FEM) are performed to optimize the number of graphene layers and the aspect ratio (AR) of Au NRs. The improved sensitivity up to 106 degree/ RIU...
Well-defined Zn0.9Li0.1O nanorods were hydrothermally synthesized at the low temperature of 90°C on the sputtered ZnO seed layer in different thickness, 20 nm and 50 nm. The x-ray diffraction patterns of both samples with a single diffraction peak (002) showed the same wurtzite hexagonal structure. The length and diameter of the nanorods were both increased from 1.12 μm to 1.47 μm and 95 nm to 113...
Well-defined KZnF3:Yb3+, Er3+, Mn2+ nanocubes were successfully prepared by a facile solvothermal method. The XRDand SEM measurements results show that the cubes have good crystallinity and the average cubic size is about 40nm The incorporation of Mn2+ ions into KZnF3:Yb3+, Er3+ leads to the great increase in the red to green luminescence intensity ratios from 10:1 to 214:1 and the red emission was...
Quantum dot light-emitting diodes (QD-LEDs) using InP/ZnSe/ZnS muitishell colloidal quantum dots (QDs) which were prepared by simple heating-up method were designed on polyethylene naphthalate (PEN) substrate for rugged optoelectronic device. The synthesized InP/ZnSe/ZnS multishell QDs exhibited an emission peak at 545 nm for clear green color with a full-width at half-maximum (FWHM) of 50 nm, and...
We will show the current-voltage behaviors and band diagrams of HIT cells with and without hole thermionic emission model. When the hole thermionic emission model is not included, only drift diffusion model is used. In such a case, the calculated current would be much larger than the practical value.
In this paper, a systematic design and analysis of slanting silicon nanohole structure is simulated using the finite element method. The slanting nanohole structure is based on the Si (111) wafer. The impact of the hole diameter and structural periodicity has been investigated. It is found that the absorption is significantly enhanced due to the strong light trapping ability of slanting nanohole structure...
In this work, we perform optical simulation and investigate the effect of the periodicity (P) and diameter (D) of SiNW arrays (SiNWs) on light harvesting in thin-film silicon/PEDOT:PSS hybrid solar cells. The hybrid cell structure comprises 2 μιη thick silicon thin film with SiNWs textured surface and 50 nm thick PEDOT:PSS top layer. It is found that the light harvesting in the SiNWs is greatly enhanced...
The electronic band structures and optical gains of Ge/SixSnyGe1−x−y truncated pyramid-shaped quantum dots (QDs) are calculated using the 8-band k.p model. The large bowing factors in the calculation of band gaps of both Ã-conduction and L-conduction valley in the barrier are considered so that the band gaps of the barrier are small. The strains are calculated by constant strain method and valence...
Copper oxide is one of the earliest semiconductor materials investigated for solar cells in the early 1900's before silicon cells became widespread. It is environmentally friendly, nontoxic and furthermore copper is an abundant metal. In spite of having low power conversion efficiencies when compared to theoretical values, there is much scope to further improve the efficiency. Copper oxide exists...
We proposed a concept of meta-surface composed of sub-wavelength groove arrays in gold film on chromium(Cr) layer with designable parameters, which allows for flexible manipulations of the Surface Plasmon Polaritons (SPPs). The SPP propagation and dispersion properties were systematically studied in the theoretical meta-surface scheme by numerical simulations. For details, a conventional SPP wave...
We demonstrate subwavelength beam focusing by a slab of anisotropic material. The proposed device consists of a slab of anisotropic material on top of which a Chromium layer with a small slit is used as the mask. By carefully designing the thickness of the anisotropic layer, we can selectively modify the phase of different wave components exiting the output surface, so that a subwavelength-sized light...
This paper demonstrate experimentally the top-cell external quantum efficiency (EQE) improving of the triple-junction GaAs-based solar cell using a SiO2-nanopillars/SiO2/TiO2 graded-index anti-reflection coating (GI-ARC). The reflectance and EQE of the solar cells with SiO2/TiO2 double-layer ARC and with SiO2-nanopillars/SiO2/TiO2 GI-ARC are measured and compared. The reflectance of cell with SiO2...
Tunable subwavelength terahertz plasmonic stub waveguide filters based on indium antimonide are proposed and numerically investigated. The transmission line theory and the Finite Different Time Domain simulation results reveal that the single-stub waveguide structure can realize a stop-band filtering function and the central wavelength of the notch is linearly dependent on the stub length while nonlinearly...
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