Catir, Fulya Esra Cimilli; Saglam, Mustafa

In this study, Schottky contacts have been fabricated on n-InP (1 0 0) using an Al/n-InP/In configuration. The current voltage (I-V) and capacitance voltage (C-V) characteristics of Al/n-InP/In Schottky diodes were calculated from the liquid nitrogen temperature to the room temperature by steps of 10 K before annealing of this structure and after annealing at 400 °C for 3 min. The series resistance, ideality factor and barrier height values calculated using I-V characteristics, Cheung functions, Norde (F-V) functions, and C-V characteristics before and after annealing the contact and compared for each temperature. These measurements clearly showed that the Al/n-InP/In Schottky diode became extremely stable due to the annealing process and the mean barrier height value have been increased from 0,494 to 0,674 eV after thermal annealing at 400 °C. In addition, temperature dependent barrier height values of as-fab. and annealed (at 400 °C) Al/n-InP/InSchottky contacts are consistent with "the barrier inhomogeneous model" of Schottky diodes.

Demir, F.; Yurtkuran, E.; Unal, R.; Ozsunar, A. K.

In this study, the non-transferred DC argon plasma torch was modeled as three dimensional and tried to determine the position of the arc root attachment. Work has been carried out using commercial software ANSYS FLUENT. Modeling was done taking into account the influence of hydrodynamic and electromagnetic forces on the flow. The changes in arc length and arc root under these forces are examined. The effects of applied current and volumetric flow rate on the arc root were evaluated. As a result, it was seen that the arc root attachment moved by the balance between hydrodynamic and electromagnetic forces. As the increased magnetic forces shift the arc root to the torch input, the increased volumetric flow rate is observed to shift the arc root attachment towards the torch output. The results were compared with the literature. (C) 2017 Elsevier Ltd. All rights reserved.

Demir, F.; Yurtkuran, E.; Unal, R.; Ozsunar, A.K.

In this study, the non-transferred DC argon plasma torch was modeled as three dimensional and tried to determine the position of the arc root attachment. Work has been carried out using commercial software "ANSYS FLUENT". Modeling was done taking into account the influence of hydrodynamic and electromagnetic forces on the flow. The changes in arc length and arc root under these forces are examined. The effects of applied current and volumetric flow rate on the arc root were evaluated. As a result, it was seen that the arc root attachment moved by the balance between hydrodynamic and electromagnetic forces. As the increased magnetic forces shift the arc root to the torch input, the increased volumetric flow rate is observed to shift the arc root attachment towards the torch output. The results were compared with the literature.