Browsing Nanoteknoloji Mühendisliği Bölümü Makale Koleksiyonu by Author "Altuntaş, İsmail"
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Arsine Flow Rate Effect on the Low Growth Rate Epitaxial InGaAs Layers
Altuntaş, İsmail (07.06.2021)Effect of arsine (AsH3) flow rate on epitaxially grown unintentionally doped and low-growth rate InGaAs layer by using metal organic vapor phase epitaxy at growth temperature 640°C are investigated. While all other sources ... -
Comprehensive growth and characterization study of GeOx/Si
Baghdedi, Dhouha; Hopoğlu, Hicret; Sarıtaş, Sevda; Altuntaş, İsmail; Abdelmoula, Najmeddine; Gür, Emre; ŞenadımTüzemen, Ebru (15.02.2023)In this study, the reactive radio frequency magnetron sputtering (RFMS) method under varying thickness was used to deposit GeO x on Si substrate at room temperature. The effect of thickness on the structural and optical ... -
Effect of substrate temperature on Raman study and optical properties of GeOx/ Si thin films
Baghdedi, Dhouha; Hopoğlu, Hicret; Demir, İlkay; Altuntaş, İsmail; Abdelmoula, Najmeddine; Şenadım, Tüzemen Ebru (14.10.2023)In this study, GeOx thin films were deposited onto Si substrates using the RF magnetron sputtering method. We looked at how the temperature of the substrate affected the Raman spectra and optical characteristics of ... -
Effects of applied external fields on the nonlinear optical rectification, second, and third harmonic generation in a quantum well with exponentially confinement potential
Altuntaş, İsmail (6.11.2021)In the present study, the nonlinear optical rectification (NOR), second harmonic generation (SHG), and third harmonic generation (THG) coefficients in GaAs/GaAlAs quantum well (QW) with exponentially confinement potential ... -
Experimental insights toward carrier localization in in-rich InGaAs/InP as candidate for SWIR detection: Microstructural analysis combined with optical investigation
Arbia, Marwa Ben; Demir, İlkay; Kaur, Navpreet; Saidi, Faouzi; Zappa, Dario; Comini, Elisabetta; Altuntaş, İsmail; Maaref, Hassen (15.01.2023)Hyperspectral imaging has been flourished thanks to the huge investigation of the infrared spectrum from NIR to LWIR bands. The ternary InGaAs has been investigated herein in the context of studying the structural ... -
High-quality AlN growth: a detailed study on ammonia flow
Yolcu, Gamze; Koçak, Merve Nur; Ünal, Dudu Hatice; Altuntaş, İsmail; Demir, İlkay (25.01.2023)High crystalline and optical quality aluminum nitride (AlN) films with thin thickness have been grown on Al2O3 by MOVPE (metal-organic vapor phase epitaxy) and the NH3 flow rate has been changed to improve the morphology and ... -
Influence of Highly Efficient Carbon Doping on AlxGa1− xAs Layers with Different Al Compositions (x) Grown by MOVPE
Pertikel, İzel; Kekül, Reyhan; Altuntaş, İsmail; Gür, Emre; Demir, İlkay (27.06.2023)Carbon (C)-doped aluminum gallium arsenide ( AlxGa1−xAs) epitaxial layers with different aluminum (Al) concentrations have been grown on gallium arsenide (GaAs) substrates by metalorganic vapor phase epitaxy (MOVPE) ... -
Investigating the optical, electronic, magnetic properties and DFT of NiO films prepared using RF sputtering with various argon pressures
Hopoğlu, Hicret; Kaya, Dogan; Maslov, Mikhail M.; Kaya, Savas; Demir, İlkay; Altuntaş, İsmail; Ungan, Fatih; Akyol, Mustafa; Ekicibil, Ahmet; Şenadım, Tüzemen Ebru (28.04.2023)In this study, we investigated the structural, optical, magnetic, and conductive properties of nickel oxide (NiO) films on glass substrates deposited using Radio Frequency (RF) magnetron sputtering with varying Ar ... -
Modeling of temperature‑dependent photoluminescence of GaN epilayer by artificial neural network
ŞenadımTüzemen, Ebru; Yüksek, Ahmet Gürkan; Demir, İlkay; Horoz, Sabit; Altuntaş, İsmail (22.06.2023)Artificial neural networks (ANNs) are a type of machine learning model that are designed to mimic the structure and function of biological neurons. They are particularly well-suited for tasks such as image and speech ... -
Vcsel tabanlı yüksek güçlü yarı iletken lazerler
Altuntaş, İsmail (15.01.2021)VCSEL’ler (vertical-cavity surface-emitting laser, düşey- kovuklu yüzey-ışımalı lazer) yirmi yılı aşkın bir süredir giderek gelişen veri iletişimi (datacom) alanının anahtar bileşenlerinden birisidir. Bunun yanında son ... -
Yüksek Güç-Frekans Uygulamaları Için MOCVD ile Epitaksiyel AlN Kristalinin Büyütülmesi, Katkılanması, Karakterizasyonu ve Aygıt Üretimi
Altuntaş, İsmail (15.03.2021)Bu projede yüksek güç-frekans uygulamaları için MOCVD (metal organik kimyasal buhar depolama) ile epitaksiyel AlN kristalinin büyütülmesi, katkılanması, karakterizasyonu ve aygıt üretimi yapılarak diyot karakteristiklerinin ... -
ZnO/Al2O3 layered structures deposited by RF magnetron sputtering on glass: growth characteristics, optical properties, and microstructural analysis
Altuntaş, İsmail (12.07.2021)In this study, Al2O3 thin films of different thicknesses (50 nm, 100 nm, 150 nm, 200 nm, and 250 nm) were, first, grown using RF magnetron sputtering technique on glass substrate at 30 °C temperature, with 120Wpower value. ...