Publications by authors named "Doru Dinescu"
Several aspects such as the growth relation between the layers of the GaN/AlN/SiC heterostructure, the consistency of the interfaces, and elemental diffusion are achieved by High Resolution Transmission Electron Microscopy (HR-TEM). In addition, the dislocation densities together with the defect correlation lengths are investigated via High-Resolution X-ray Diffraction (HR-XRD) and the characteristic positron diffusion length is achieved by Doppler Broadening Spectroscopy (DBS). Moreover, a comparative analysis with our previous work (i.
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- The article assesses the characteristics of GaN/AlN/Si heterostructures that affect their efficiency as positron moderators, focusing on aspects like layer thickness, crystal structures, and dislocation densities.
- High-resolution techniques such as transmission electron microscopy (HR-TEM) and X-ray diffraction (HR-XRD) were used to analyze the materials' structural properties and extract relevant data on dislocation densities.
- The findings indicate a correlation between dislocation densities in the GaN film and effective positron diffusion length, with a reported value of 43 ± 6 nm for the better-performing structure.
Article Synopsis
- The study investigates the defect characteristics of a commercially available GaN/AlN/AlO wafer using advanced techniques like HR-XRD, HR-TEM, and DBS.
- Through these methods, defect densities and correlation lengths in the GaN film were extracted, revealing a detailed structure of the heterostructure layers.
- The results indicate a significant relationship between defect densities, their correlation lengths, and the positron diffusion length, with specific values calculated for the GaN layer.
The chemical configuration and interaction mechanism of hydrogen adsorbed in inorganic nanoparticles of WS are investigated. Our recent approaches of using hydrogen activated by either microwave or radiofrequency plasma dramatically increased the efficiency of its adsorption on the nanoparticles surface. In the current work we make an emphasis on elucidation of the chemical configuration of the adsorbed hydrogen.
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