The effect of structural transformation in the DBR stack on the progress of optical properties was studied. Distributed Bragg Reflectors (DBRs) optimized for ultraviolet-A reflectivity were fabricated with pairs of alternating AlN thin films using an explicit combination of low-n and high-n to further investigate the thin film optical properties. The resulting refractive index is associated with density and aluminum nitride content of the thin films. The resulting refractive index ranging from 1.6 to 2.0 at 400 nm was tuned by controlling the sputter gas flow rate ratio of Ar and N2. Combinations of argon (Ar) and nitrogen (N2) gases were used in RF magnetron sputtering of an AlN target. more Abstract Aluminum nitride (AlN) films with controlled oxygen content were deposited on silicon substrates, and optical properties studied with dependency on film morphology.
A comprehensive analysis on the progressive formation of native oxide on copper is discussed.Ībstract Aluminum nitride (AlN) films with controlled oxygen content were deposited on silicon su. X-ray photoelectron spectroscopy was also performed on the samples aged for 7 months to obtain their chemical characteristics. A native oxide was grown on the prepared copper films over 250 days in air and periodically evaluated with reflectometry-ellipsometry. In this study, thin copper films were deposited using electron-beam evaporation and sputtering. Because of their similar refractive index and extinction coefficient, optically differentiating these two phases is a challenge, yet it is critical for designing devices. Cu2O and CuO often form concurrently within the native oxide. These two phases exhibiting distinctive electrical characteristics, would make copper oxide a prospective material for resistive switches. However, copper oxide, known to have two primary stable phases, cuprous oxide (Cu2O) and cupric oxide (CuO), is a material worth investigating for electronic applications. more Native oxide grown on copper has been a nuisance in electrical devices due to extra electrical resistance added to copper electrodes. Native oxide grown on copper has been a nuisance in electrical devices due to extra electrical re. In contrast, a pristine PTFE experiences a very small, monotonic increase of surface oxidation or O/C ratio with time of exposure to oxygen atoms, while the F/C ratio is virtually unchanged from that of the unexposed polymer (2. The greater the extent of hydrocarbon contamination in the PTFE, the larger are the amplitudes of the 'spikes' in the O/C- and F/C-exposure time plots. As revealed by X-ray photoelectron spectroscopy (XPS) analysis, the oxygen-to-carbon ratio (O/C) for such a polymer can increase sharply, and correspondingly the fluorine-to-carbon ratio (F/C) can decrease sharply, at very short exposure times at longer times, however, such changes in the O/C and F/C ratios reverse direction, and these ratios then assume values similar to those of the unexposed PTFE. more The presence of hydrocarbon contamination on the surface of polytetrafluoroethylene (PTFE) markedly affects the oxygen uptake, and hence the wettability, of this polymer when exposed to an oxygen plasma. The presence of hydrocarbon contamination on the surface of polytetrafluoroethylene (PTFE) marked.
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