Raman backscattering studies for a series of cubic SiC (3C-SiC) single-crystal films grown on (100)Si by way chemical vapor deposition (CVD) with film thicknesses dSiC from 600 Å to 17 μm are performed. spectra samples dSiC>4 show sharp and strong feature which obeys the selection rule 3C-SiC LO(Γ) phonon line. The signals Si substrate same polarization behavior confirms that crystalline orientations same. Although there is big lattice mismatch 20% between observed shifts 3C-SiC/Si...

We propose a reliable and simple approach for dispersion engineering in lithium niobate microring resonators (MRRs). With strong coupling-induced mode hybridization inverse design method, we overcome the large normal achieve broadband frequency comb coverage near 525 nm. adopt neural network method design, which outperforms traditional forward based on manual trial-and-error intuitive judgment. Our numerical results demonstrate possibility of generating visible Kerr soliton microcomb with...

This publisher's note contains a correction to Opt. Lett.50, 1751 (2025)10.1364/OL.555498.

Surface and interface properties of CdTe/CdS/SnO2/glass heterojunction solar cells are studied by means x-ray photoelectron spectroscopy (XPS), secondary ion mass (SIMS), optical reflectance (OR) techniques. First, n-type CdS layer was grown solution growth technique on the SnO2 coated glass substrate then p-type CdTe deposited metal-organic chemical-vapor deposition. Despite many other efficiency limiting mechanisms in cells, this article shows that surfaces interfaces play an important...

The radiative defect density ρ, as determined by high-resolution, low-temperature photoluminescence, was for 11 single crystal films of CdTe grown molecular beam epitaxy on (001) InSb in the temperature interval 170–285 °C. A minimum 0.6% is found ρ near 185 °C compared to 2.5% best previously reported value, indicating a high degree perfection our films. X-ray double-crystal rocking curves have also been obtained these films, and full width at half-maximum neighborhood

An efficient numerical code FP3D has been developed to calculate particle orbits and evaluate confinement in 3D magnetic fields including stellarators tokamaks with fields. The field is either calculated from coils directly or obtained equilibrium codes. verified the Variational Moments Equilibrium Code [Hirshman Whitson, Phys. Fluids 26, 3553–3568 (1983)] for calculation drift-kinetic Stellarator Fokker–Planck Iterative Neoclassical Conservative Solver [Landreman et al., Plasmas 21(4),...

In previous luminescence studies on CdTe epitaxial films, a line Dμ at 1.593 eV has been associated with the recombination of exciton bound to neutral donor. We have new evidence suggest that cannot be simple donor impurity, but should donor-like structural defects or impurity-defect complexes.

Particle transport in tokamak devices due to wave-particle resonance induced diffusion is studied. The coefficient derived both analytically using quasilinear theory, and numerically a test particle code, the obtained agrees with each other its validity regime. Dependence of on turbulence intensity, radial mode structures, energy investigated. It found that proportional maximized for Et≃Ti, krΔ0≃1. Here, Et energy, Ti thermal ion temperature, Δ0 distance between neighboring rational...

A series of MBE-grown CdTe/InSb(001) heterostructures with different substrate growth temperatures is studied using X-ray photoelectron spectroscopy (XPS) and secondary-ion mass spectrometry (SIMS). XPS shows that Te exists mainly as TeO2 at the sample surface, while In In2O In2O3. The Cd/Te ratio greater than one indicating surface Cd rich. Both SIMS reveal interdiffusion directly. depth profiles 3D 4D spectra indicate concentration in CdTe film grown high temperature, Ts, significantly...

An optimized compact stellarator with four simple coils is obtained from direct optimization via a coil shape. The new consists of two interlocking and vertical field similar to those the Columbia Non-neutral Torus (CNT) (Pedersen et al. , Phys. Rev. Lett. vol. 88, 2002, pp. 205002). configuration has global magnetic well low helical ripple level comparable that Wendelstein 7-X (W7-X) (Wolf Nucl. Fusion 57, 2017, 102020). have smooth three-dimensional shape much simpler than advanced...

InGaAsN films and InGaAsN/GaAs quantum wells were grown by metalorganic chemical vapor deposition using 1,1-dimethylhydrazine tetrirybutylarsice as N As sources, respectively. A photoluminescence peak at 1.22 μm wavelength low temperature was observed for the In0.26Ga0.74As1−yNy/GaAs wells. X-ray photoelectron spectroscopy investigation on demonstrated success of nitrogen incorporation provided evidence existence two principle configurations, indicating formation N–In N–O,H bonds. The...

A neoclassically optimized compact stellarator with simple coils has been designed. The magnetic field of the new is generated by only four planar including two interlocking elliptical shape and circular poloidal coils. coil topology same as that Columbia Non-neutral Torus (CNT) [Pedersen et al., Phys. Rev. Lett. 88, 205002 (2002)]. configuration was obtained minimizing effective helical ripple directly via very low in plasma core, implying excellent neoclassical confinement. This confirmed...

An optimization study of Quasi-Axisymmetric (QA) stellarators with varied elongation has been carried out using the code STELLOPT. The starting point our is a previously obtained QA stellarator three field periods and an aspect ratio 6. A series are at zero plasma beta value ranging from 2.5 to 3.7. good quasi-symmetry kept when reduced original rotational transform profile fixed. volume ether fixed or linearly elongation. Furthermore, finite considered. corresponding bootstrap currents...

We introduce an approach for numerically solving the Poisson equation by using a physical model, which is way to solve partial differential without finite difference method. This method especially useful obtaining solutions in very many free-charge neutral systems with open boundary conditions. It can be used arbitrary geometry and mesh style more efficient comparing widely-used iterative algorithm multigrid methods. suitable parallel computing. also applied other equations whose Green...

A new linked mirror device for magnetic confinement experiment is proposed.The consists of two straight mirrors connected by half-torus.The structure the configuration as a whole three dimensional because linear sections are not parallel.The angle between generates rotational transform which results in good toroidally processing passing particles.In this way usual loss cone traditional machines eliminated.The single particle similar to that tokamaks with most particles well confined.The...

CdTe solar cells were fabricated by depositing films on CdS/SnO2/glass substrates using close‐spaced sublimation (CSS) and metalorganic chemical vapor deposition (MOCVD). Te/Cd mole ratio was varied in the range of 0.02 to 6 MOCVD growth ambient an attempt vary native defect concentration. Polycrystalline layers grown CSS both showed average grain size about 2 μm. However, found be less faceted more dense compared MOCVD. techniques conditions had a significant impact electrical...