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Recent submissions

Elektrik-Elektronik Mühendisliği Bölümü: Recent submissions

Toplam kayıt 189, listelenen: 1-20

Sonraki Sayfa

Investigation of thermally evaporated high resistive B-doped amorphous selenium alloy films and metal contact studies

Oner, Cihan; Nguyen, Khai V.; Pak, Rahmi O.; Mohammad, A. Mannan; Mandal, Krishna C. (SPIE, 2015)

Amorphous selenium (a-Se) alloy materials with arsenic, chlorine, boron, and lithium doping were synthesized for room temperature nuclear radiation detector applications using an optimized alloy composition for enhanced ...
High-barrier Schottky contact on n-type 4H-SiC epitaxial layer and studies of defect levels by deep level transient spectroscopy (DLTS)

Nguyen, Khai V.; Pak, Rahmi O.; Oner, Cihan; Mohammad, A. Mannan; Mandal, Krishna C. (SPIE, 2015)

High barrier Schottky contact has been fabricated on 50 μm n-type 4H-SiC epitaxial layers grown on 350 μm thick substrate 8° off-cut towards the [11̅20] direction. The 4H-SiC epitaxial wafer was diced into 10 x 10 mm2 ...
Surface passivation and isochronal annealing studies on n-type 4H-SiC epitaxial layer

Mohammad, A. Mannan; Nguyen, Khai V.; Pak, Rahmi O.; Oner, Cihan (SPIE, 2015)

Schottky barrier radiation detectors were fabricated on the Si-face of 50 μm thick detector grade n-type 4H-SiC epitaxial layers. The junction properties of the fabricated detectors were investigated by current-voltage ...
Defect characterization of Cd0.9Zn0.1Te crystals using electron beam induced current (EBIC) imaging and thermally stimulated current (TSC) measurements

Pak, Rahmi O.; Nguyen, Khai V.; Oner, Cihan; Mohammad, A. Mannan; Mandal, Krishna C. (SPIE, 2015)

Semi-insulating Cd0.9Zn0.1Te nuclear detector grade crystals were grown by a low temperature solution method from in-house zone refined (~7N) precursor materials. The processed crystals from the grown ingot were thoroughly ...
Investigation of metal contacts on high-resistivity large-area amorphous selenium alloy films

Oner, Cihan; Nguyen, Khai V.; Pak, Rahmi O.; Chowdhury, Towhid A.; Mandal, Krishna C. (IEEE, 2015)

Amorphous selenium (a-Se) alloy materials doped with lithium (Li), boron (B), arsenic (As), and chlorine (Cl), were synthesized for room temperature radiation detection applications using an optimized alloy composition for ...
Investigation of 12 μm 4H-SiC epilayers for radiation detection and noise analysis of front-end readout electronics

Nguyen, Khai V.; Pak, Rahmi O.; Oner, Cihan; Zhao, Feng; Mandal, Krishna C. (IEEE, 2015)

Schottky barrier radiation detectors were fabricated on 12 μm n-type 4H-SiC epitaxial layers grown on a 4° off-axis highly doped 4H-SiC substrate (0001). Schottky barrier junction properties were characterized through ...
Characterization of Cd0.9Zn0.1Te single crystals for radiation detectors

Pak, Rahmi O.; Nguyen, Khai V.; Oner, Cihan; Chowdhury, Towhid A.; Mandal, Krishna C. (IEEE, 2015)

Large volume single crystals of Cd 0.9 Zn 0.1 Te (CZT) have been grown by vertical Bridgman technique using in-house zone refined precursor materials (Cd, Zn, and Te). The grown semi-insulating CZT crystals have shown high ...
Deep levels in n-type 4H-silicon carbide epitaxial layers investigated by deep-level transient spectroscopy and isochronal annealing studies

Mohammad, A. Mannan; Nguyen, Khai V.; Pak, Rahmi O.; Oner, Cihan; Mandal, Krishna C. (IEEE, 2016)

Deep levels were investigated by the capacitance mode deep-level transient spectroscopy (C-DLTS) on 4H-SiC Schottky barrier diodes fabricated on 50 μm-thick n-type 4HSiC epitaxial layers. C-DLTS scans from 80 K to 800 K ...
Improved radiation detectors on 4H-SiC epilayers by edge termination

Oner, Cihan; Chowdhury, Towhid A.; Pak, Rahmi O.; Mandal, Krishna C. (SPIE, 2016)

We report the development of an edge termination by depositing thin Si3N4 passivating film on 4H-SiC epilayer based radiation detector. The edge termination method is shown to be very effective for improving both the ...
Synthesis and characterization of amorphous selenium alloys radiation detectors

Chowdhury, Towhid A.; Oner, Cihan; Mandal, Krishna C. (IEEE, 2017)

Synthesized amorphous selenium (a-Se) alloy materials have been characterized for room temperature high-energy nuclear radiation detectors and x-ray detection applications. The alloy composition has been optimized to ensure ...
Deep level transient spectroscopy and pulse height measurements on high resolution n-type 4H-SiC epitaxial schottky barrier radiation detectors

Oner, Cihan; Chowdhury, Towhid A.; Santi, Enrico; Mandal, Krishna C. (IEEE, 2017)

High resolution 20 μm n-type 4H-SiC epitaxial layer Schottky barrier radiation detectors were fabricated by depositing nickel (Ni) contacts using DC sputtering for both front- and backside. Current-Voltage (I-V) measurements ...
Crystal growth and characterization of Cd0.9Zn 0.1Te for gamma-ray detectors: thermally stimulated current (TSC), electron beam induced current (EBIC), and pulse height spectroscopy (PHS)

Oner, Cihan; Chowdhury, Towhid A.; Mandal, Krishna C. (IEEE, 2017)

Cd0.9Zn0.1Te (CZT) detector grade crystals were grown from in-house zone refined Cd, Zn, and Te (7N) precursor materials, using a low temperature tellurium solvent growth method. These crystals were grown using a high ...
Design and response testing of Boron-Diffused silicon carbide neutron detectors for Dosimetry and Monitoring applications

Mandal, Krishna C.; Chowdhury, Towhid A.; Oner, Cihan; Ruddy, Frank H. (ASTM INTERNATIONAL, 2018-12-14)

A high-sensitivity boron-diffused silicon carbide (4H-SiC) p-n diode has been designed and fabricated using vapor-phase epitaxy. Boron-10 (10B) is diffused into nitrogen-doped n- SiC, forming the p+ layer, and thermal ...
Cadmium zinc telluride (czt) room temperature radiation detectors: an overview

Öner, Cihan (Eğitim Yayınevi, 2023-10)
Design of a compact microstrip quadruplexer with closely spaced switchable and tunable channels based on asymmetrical dual-mode loop resonators

Görür, Ali Kürşad; Türkeli, Alper; Karpuz, Ceyhun; Görür, Adnan (2020-12-01)

In this letter, a switchable microstrip quadruplexer based on asymmetrical dual-mode loop resonators (ADMLRs) is presented. Four ADMLRs at different electrical lengths for creating four channels are coupled to input/output ...
A novel compact microstrip diplexer with closely spaced channels

Görür, Ali Kürşad; Türkeli, Alper; Doğan, Engin; Karpuz, Ceyhun; Görür, Adnan (2021-01-02)

A novel microstrip diplexer with closely spaced channels is introduced by using stub loaded dual-mode square loop resonators (DMSLRs). The proposed resonator is constructed by locating open-circuited stubs with narrow slits ...
A high isolation quad‐channel microstrip diplexer based on codirectional split ring resonators

Görür, Ali Kürşad; Türkeli, Alper; Büyüktuna, Mert; Doğan, Engin; Karpuz, Ceyhun; Görür, Adnan (2022-04-27)

In this study, a novel microstrip diplexer with four channels is designed by using codirectional split ring resonators (CDSRRs). Since CDSRRs provide dual resonance behavior, dual-band bandpass filter with two poles at ...
Design of a novel dual-wideband filtenna

Türkeli, Alper; Görür, Ali Kürşad; Altuncu, Yasemin (2022-07-18)

In this paper, a novel microstrip-fed filter-antenna (filtenna) exhibiting dual-wideband response is introduced. In this direction, a dual-wideband bandpass filter is designed first and then it is integrated into the feed ...
Katı hal güç kuvvetlendiricisinin LC-GFDM iletim sinyali üzerindeki etkisinin incelenmesi

Şimşir, Şakir; Taşpınar, Necmi (2022-10)

Bu çalışmada, en yaygın kullanılan yüksek güç kuvvetlendiricileri arasında yer alan katı hal güç kuvvetlendiricisi (SSPA), düşük karmaşıklı-genelleştirilmiş frekans bölmeli çoğullama (LC-GFDM) vericisine uygulanmış olup, ...
A novel selective mapping method based on cumulative symbol optimization for PAPR minimization in low complexity GFDM transmitter

Şimşir, Şakir; Taşpınar, Necmi (2022-05)

In this paper, the problem of high peak-to-average power ratio (PAPR) in the low complex version of the generalized frequency division multiplexing (LC-GFDM) is handled by developing a novel PAPR reduction method called ...