Enhancement of Piezoelectricity in Dimensionally Engineered Metal‐Halide Perovskites Induced by Deep Level Defects

Natural and engineered perovskites.

Detailed characterization of deep level defects in InGaN Schottky diodes by optical and thermal deep level spectroscopies

Schottky diode properties of semitransparent Ag(4 nm)/Au(4 nm) metal stack on In0.2Ga0.8N were investigated and defect characterization was performed using capacitance deep level transient (DLTS) and optical spectroscopy (DLOS). DLTS measurements made on the In0.2Ga0.8N Schottky diodes, which displayed a barrier height of 0.66 eV, revealed the presence of two deep levels located at Ec-0.39 eV a...

The Interaction of Hydrogen with Deep Level Defects in Silicon

6 Self-interstitial–hydrogen complexes in silicon and germanium . . . . . . . . 21 6.1 Experimental work on IH2 defects . . . . . . . . . . . . . . . . . . . . . . . . . . 21 6.2 The silicon self-interstitial . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22 6.3 Interstitial complexes with one hydrogen atom . . . . . . . . . . . . . . . . . . . 23 6.4 Di-hydrogenated split intersti...

Pressure-induced anomalous phase transitions and colossal enhancement of piezoelectricity in PbTiO3.

We find an unexpected tetragonal-to-monoclinic-to-rhombohedral-to-cubic phase transition sequence induced by pressure, and a morphotropic phase boundary in a pure compound using first-principles calculations. Huge dielectric and piezoelectric coupling constants occur in the transition regions, comparable to those observed in the new complex single-crystal solid-solution piezoelectrics such as P...

‏‎suppression of coke formation in thermal cracking by coke inhibitors‎‏

‏‎the main purpose of this research was to:1.develop a coking model for thermal cracking of naphtha.2.study coke inhibition methods using different coke inhibitors.developing a coking model in naphtha cracking reactors requires a suitable model of the thermal cracking reactor based on a reliable kinetic model.to obtain reliable results all these models shall be solved simultaneously.for this pu...