Improvement in electrical properties of hafnium and zirconium silicates by postnitriding

Abstract

Hafnium and zirconium silicate films were deposited on a silicon substrate and the effects of postannealing on their electrical properties were investigated. When the films are postannealed in nitrogen monoxide (NO), the leakage current becomes lower by more than one order of magnitude as compared with that of the as-deposited films. The capacitance-voltage (C-V) hysteresis width is also decreased drastically by the NO postannealing. From electron spin resonance spectroscopy, it is indicated that paramagnetic defects at the interface between the film and the substrate are responsible for the leakage current and the C-V hysteresis. It is also indicated by x-ray photoelectron spectroscopy that the postnitridation effectively terminates these interface defects and contributes to the improvement in electrical properties.

Josephson Current in f -Wave Superconductor/ f -Wave Superconductor Junctions

“…[11] From the analysis of the temperature dependence of the field-swept nuclear magnetic resonance (NMR) spectra, Kato et al conclude that the p-or f -wave pairing state with triplet spin symmetry may be the most preferred in the superconducting state of Na x CoO 2 • yH 2 O. [12] There have been several theoretical works. [13−21] Since the formation of the zero-energy states (ZES) is a general phenomenon in unconventional superconductor junctions, [22−24] the zero-bias conductance peak (ZBCP) is also expected in spin-triplet superconductor junctions.…”

Synthesis and Characterization of Nanocrystalline Cr2O3 and ZrO2 Ceramic Materials

“…[1][2][3][4][5][6][7][8][9][10] Chromia and zirconia are two such important refractory materials because of their high melting temperature (2400 C) and higher high temperature oxidation resistance. [4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20] The crystal structure of three major zirconia phases are: Cubic (ZrO 2 ) (has the ideal fluorite structure), Tetragonal (t), and monoclinic (m). Undoped ZrO 2 exhibits the following phase transitions during thermal cycling: 7 These transformations are important for the processing and mechanical properties of nc-ZrO 2 .…”

“…Variation of PL intensity with excitation intensity is linear for trap related transitions, where as it is square for band to band transitions owing to enhanced oscillator strength [4][5][6]. For small carrier life time, variation of such PL intensity reflects the distribution of the deep…”