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Recent Submissions

Interfacial modification by 2-fluoroisonicotinic acid enabling high-efficiency and stable n-i-p perovskite solar cells Sun, Lei; Zhang, Chu; Bektaş, Gence; Li, Xiaowei; Ma, Chunying; Ma, Tingli (2024-12-01) The power conversion efficiency (PCE) of organic-inorganic halide perovskite solar cells (PSCs) developed rapidly in recent years. However, the defects at the bulk grain boundaries and heterojunction interfaces acting as n...
Unveiling the application potential of PbMo0.75W0.25O4 crystal: Linear and nonlinear optical properties through ellipsometry Isik, M.; Hasanlı, Nızamı (2024-12-01) PbMo0.75W0.25O4 compound is formed by replacing one quarter of the Mo atoms in the PbMoO4 with W atoms and has significant potential for optoelectronic applications. Optical properties of PbMo0.75W0.25O4 single crystal hav...
A search for Planet Nine with small spacecraft: Three-body, post-Newtonian, non-gravitational, planetary and Kuiper Belt effects Koprucu, Sahin Ulas; Tekin, Bayram (2024-12-01) A hypothetical gravitating body in the outer Solar System, the so-called Planet Nine, was proposed to explain the unexpected clustering of the Kuiper Belt Objects. As it has not been observed via telescopes, it was conject...
Single-beam low-frequency loss modulation technique for two-photon absorption measurement Kadan, Viktor; Pavlov, Ihor; Dmytruk, Andriy; Blonskyi, Ivan; Pavlova, Tetiana; Serozhkin, Yuriy; Goodarzi, Arian; Bondar, Mykhailo (2024-10-15) We present a straightforward and reliable single-beam configuration designed for the assessment of two-photon absorption (2PA) through the utilization of the loss modulation technique. Mechanical rotation of a half-wave pl...
Exploring Temperature-Dependent bandgap and Urbach energies in CdTe thin films for optoelectronic applications Surucu, O.; SÜRÜCÜ, GÖKHAN; Hasanlı, Nızamı; Parlak, Mehmet; Isik, M. (2024-10-15) This study examines CdTe thin films deposited via RF magnetron sputtering, focusing on structural and optical properties. X-ray diffraction, Raman spectroscopy, and SEM assessed structural characteristics. Optical properti...
Constraints and time evolution in generic f(Riemann) gravity Altas, Emel; Tekin, Bayram (2024-10-11) We give a detailed canonical analysis of the n-dimensional f(Riemann) gravity, correcting the earlier results in the literature. We also write the field equations in the Fischer-Marsden form which is amenable to identifyin...
A quantal diffusion approach for multinucleon transfer in heavy-ion collisions Kayaalp, A.; Arık, Mert; Ocal, S.E.; Yılmaz, Osman; Umar, A.S. (2024-10-01) The stochastic mean-field (SMF) approach beyond the time-dependent-Hartree-Fock theory is used to explore the primary production cross sections in Ni64+130Te at the bombarding energy Ec.m.=184.3 MeV and Pb206+118Sn at Ec.m...
A statistical analysis of atmospheric parameters for cataloged astronomical observatory sites Kurt, Zühal; Yerli, Sinan Kaan; AKSAKER, NAZIM; AKTAY, ALİŞAN; ERDOĞAN, MEHMET AKİF (2024-10-01) Astronomical sites have to be selected according to many factors whereas the geographic location of the site and the quality of the atmosphere above the site play an important role in the decision process. The following fa...
Astronomical site selection for Antarctica with astro-meteorological parameters Aksaker, Nazim; Bayazit, M.; Kurt, Z.; Yerli, Sinan Kaan; Aktay, Alişan; Erdoğan, Mehmet Akif (2024-10-01) The primary objective of this study is to employ Multi-Criteria Decision Analysis (MCDA) and Geographical Information System (GIS) techniques to identify and assess potential sites for astronomical observations in Antarcti...
Identification of shallow trap centers in InSe single crystals and investigation of their distribution: A thermally stimulated current spectroscopy Isik, M.; Hasanlı, Nızamı (2024-10-01) Identification of trap centers in semiconductors takes great importance for improving the performance of electronic and optoelectronic devices. In the present study, we employed the thermally stimulated current (TSC) metho...
Spectroscopic ellipsometry study of linear and nonlinear optical properties of NaBi(Mo0.5W0.5O4)2 crystal Isik, M.; Guler, I.; Hasanlı, Nızamı; Darvishov, N.H. (2024-10-01) In this study, linear and nonlinear optical characteristics of NaBi(Mo0.5W0.5O4)2 crystal, a new material that may have potential for optoelectronic applications, were investigated. NaBi(Mo0.5W0.5O4)2 single crystals were ...
Characterization of Bi<sub>12</sub>SiO<sub>20</sub> single crystal: understanding structural and thermal properties ALTUNTAŞ, GÖZDE; Isik, M.; Hasanlı, Nızamı (2024-10-01) This study presents a thorough examination of the structural and thermal characteristics of Bi12SiO20 crystal. X-ray diffraction (XRD) analysis was employed to investigate the crystallographic structure, while scanning ele...
Pulse frequency variations and timing noise of MXB 0656-072 during the 2007-2008 type I outbursts and implications for its magnetic field Serim, M. M.; Serim, D.; Dönmez, Çağatay Kerem; Tuo, Y.; Ducci, L.; Baykal, Altan; Santangelo, A. (2024-10-01) Aims. We aim to explore the properties of the Be/X-ray binary system MXB 0656–072 from a timing analysis perspective through an investigation of the RXTE/PCA and Fermi/GBM data during its 2007–2008 type I outbursts.Met...
Pulse frequency variations and timing noise of MXB 0656–072 during the 2007–2008 type I outbursts and implications for its magnetic field Serim, Muhammed Miraç; Serim, Danjela; Dönmez, Çağatay Kerem; Tuo, Youli; Ducci, Lorenzo; Santangelo, Andrea (EDP Sciences, 2024-9-25) Aims. We aim to explore the properties of the Be/X-ray binary system MXB 0656–072 from a timing analysis perspective through an investigation of the RXTE/PCA and Fermi/GBM data during its 2007–2008 type I outbursts. Metho...
Hydrogen thermal activation of defects enabling firing stable Poly-Si based passivating contacts for TOPCon solar cells Uygun, Berkay; Altiner, Gokhan; Hande Ciftpinar, E.; Mert Kaplan, Y.; Huseyin Canar, H.; Turan, Raşit; Nasser, Hisham (2024-09-01) Passivating contacts based on poly-Si/SiOx also referred to as TOPCon (tunnel oxide passivated contacts) have substantially improved the performance of crystalline silicon (c-Si) solar cells. Hydrogenation in TOPCon has th...
Development of a selective wet-chemical etchant for precise 3D sculpting of silicon enabled by infrared non-linear laser modification Zolfaghari Borra, Mona; Radfar, Behrad; Nasser, Hisham; Çolakoğlu, Tahir; Tokel, Onur; Turnalı, Ahmet; Işık Taşgın, Dilek; Toffoli, Hande; Toffoli, Daniele; İlday, Fatih Ömer; Turan, Raşit; Pavlov, Ihor; Bek, Alpan (2024-09-01) Recently-demonstrated high-quality three-dimensional (3D) subsurface laser processing inside crystalline silicon (c-Si) wafers opens a door to a wide range of novel applications in multidisciplinary research areas. Using t...
Development of Polarization-Insensitive THz-to-IR Converters for Low-IR-Signature Target Detection and Imaging Aytaç, Berat; ŞAHİN, ASAF BEHZAT; Altan, Hakan (2024-09-01) A THz-to-IR converter can be an effective solution for the detection of low-IR-signature targets by combining the advantages of mature IR detection mechanisms with high atmospheric transmittance in the THz region. A metall...
Optical characterization of NaBi(MoO4)2 crystal by spectroscopic ellipsometry Guler, I.; Isik, M.; Hasanlı, Nızamı (2024-09-01) The compound NaBi(MoO4)2 has garnered significant interest in optoelectronic fields. This study employs spectroscopic ellipsometry to thoroughly examine the linear and nonlinear optical characteristics of NaBi(MoO4)2 cryst...
Gate leakage reduction in AlGaN/GaN HEMTs using in situ ion treatment Nawaz, Muhammad Imran; Gurbuz, Abdulkadir; Salkim, Gurur; Zafar, Salahuddin; Akoglu, Busra Cankaya; Bek, Alpan; Ozbay, Ekmel (2024-09-01) A new in situ treatment method is proposed to reduce the gate leakage in normally-on AlGaN/GaN HEMTs. It consists of O2-Ar ion bombardment before the gate metalization. Ion treatment is found to improve the quality of gate...
Minimal Einstein-Aether theory Gürses, Metin; Şentürk, Çetin; Tekin, Bayram (2024-09-01) We show that there is a phenomenologically and theoretically consistent limit of the generic Einstein-Aether theory in which the Einstein-Aether field equations reduce to Einstein field equations with a perfect fluid distr...

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