Analysis of the Junction Properties of C/GaSe<sub>0.5</sub>S<sub>0.5</sub>/C Back-to-Back Schottky-Type Photodetectors

Khanfar, Hazem K.
Qasrawi, Atef F.
Hasanlı, Nızamı
In this paper, a C/GaSe0.5S0.5/C metal-semiconductor-metal photodetector is suggested and described. The device is explored by means of current-voltage and capacitance-voltage (C-V) characteristics under different photoexcitation intensities. It was observed that the design of the back-to-back Schottky device has reduced the dark current of the normal Ag/GaSe0.5S0.5/C Schottky diode by 13 times and increased the photosensitivity from 3.8 to similar to 2.1x10(3). The device exhibited a barrier height of 0.842 eV in the dark. The barrier height is reduced via photoexcitation. In addition, the C/GaSe0.5S0.5/C device exhibited an ON/OFF switching property from low injection OFF to high injection ON at specific biasing voltages. This voltage decreased with the increasing illumination intensity. On the other hand, the C-V characteristics of the device, which was recorded for an ac input signal with 100 MHz at different levels of photoexcitation shifted up when the intensity of light was increased. When the same measurement was repeated at signal frequency of 1.6 GHz, the C-V characteristics reflected a different level of capacitance response. These features of C/GaSe0.5S0.5/C photodetectors nominate the device to be used as multipurpose optical switches being suitable to store different levels of electromagnetic energy at microwave frequencies.
IEEE Sensors Journal


Investigation of the dynamic properties of plate-like structures
Kahraman, Engin; Şahin, Melin; Department of Aerospace Engineering (2011)
This study presents the investigation and the verification of the modal parameters of a plate-like structure by using different modal analysis methods. A fin-like structure which is generally used in aircraft is selected as a subcategory of a plate-like test structure. In the first part of the thesis, the natural frequencies and the corresponding mode shapes of the fin are extracted by Finite Element Analysis method. Classical Modal Analysis and Testing methods comprising both impact hammer and modal shaker...
Classification of Automorphism Groups of Rational Elliptic Surfaces
Karayayla, Tolga (null; 2011-01-06)
In this paper, we give a classification of (regular) automorphism groups of relatively minimal rational elliptic surfaces with section over the field which have non-constant J-maps. The automorphism group of such a surface B is the semi-direct product of its Mordell–Weil group and the subgroup of the automorphisms preserving the zero section σ of the rational elliptic surface B. The configuration of singular fibers on the surface determines the Mordell–Weil group as has been shown by Oguiso and Shioda (...
Investigation of design and analyses principles of honeycomb structures
Aydıncak, İlke; Kayran, Altan; Department of Aerospace Engineering (2007)
In this thesis, design and analyses of honeycomb structures are investigated. Primary goal is to develop an equivalent orthotropic material model that is a good substitute for the actual honeycomb core. By replacing the actual honeycomb structure with the orthotropic model, during the finite element analyses, substantial advantages can be obtained with regard to ease of modeling and model modification, solution time and hardware resources . To figure out the best equivalent model among the approximate analy...
Estimation of pico-satellite attitude dynamics and external torques via Unscented Kalman Filter
Söken, Halil Ersin (FapUNIFESP (SciELO), 2014-01-01)
In this study, an Unscented Kalman Filter (UKF) algorithm is designed for estimating the attitude of a picosatellite and the in-orbit external disturbance torques. The estimation vector is formed by the satellite's attitude, angular rates, and the unknown constant components of the external disturbance torques acting on the satellite. The gravity gradient torque, residual magnetic moment, sun radiation pressure and aerodynamic drag are all included in the estimated external disturbance torque vector. The sa...
The thermoluminescent properties of lithium triborate (LiB3O5) activated by aluminium
Depci, Tolga; Yılmaz, Ayşen; Yılmaz, Ayşen; YAZICI, AHMET NECMEDDİN (2008-03-01)
In this paper, the thermoluminescence (TL) dosimetric characteristics of Al-doped LiB3O5 compounds are presented. The powder samples were prepared by the solid-state reaction method and the formation of the compounds were confirmed by an X-ray diffraction study. The TL studies of undoped and Al-doped LiB3O5 samples showed similar glow curve structures. They have three TL glow peaks at about 60, 130 and 200 degrees C after heating at a constant heating rate of 1 degrees C/s. Their comparative TL studies indi...
Citation Formats
H. K. Khanfar, A. F. Qasrawi, and N. Hasanlı, “Analysis of the Junction Properties of C/GaSe<sub>0.5</sub>S<sub>0.5</sub>/C Back-to-Back Schottky-Type Photodetectors,” IEEE Sensors Journal, pp. 2269–2273, 2015, Accessed: 00, 2020. [Online]. Available: