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Recent Submissions

Temperature effects on optical characteristics of CdSe thin films Gullu, H. H.; Isik, M.; Surucu, O.; Hasanlı, Nızamı; Parlak, Mehmet (Elsevier BV, 2021-03-01) CdSe is one of the significant members of II-VI type semiconducting family and it has a wide range of technological applications in which optoelectronic devices take a special position. The present paper reports the struct...
The investigation of electronic nature and mechanical properties under spin effects for new half-metallic ferromagnetic chalcogenides Ag3CrX4 (X = S, Se, and Te) Erkisi, Aytac; YILDIZ, BUĞRA; Wang, Xiaotian; Isik, Mehmet; Ozcan, Yusuf; Sürücü, Gökhan (2021-02-01) © 2020This study presents the electronic and mechanical characteristics of ternary silver-based Ag3CrX4 (X = S, Se, and Te) chalcogenides having simple cubic crystalline structure (SC), conforming P4-3m (space group: 215) ...
Calculation of the inverse relaxation time and the activation energy as a function of temperature for the Raman modes close to the phase transitions in solid nitrogen Yurtseven, Hasan Hamit; Akay, O. (Elsevier BV, 2021-02-01) The inverse relaxation time is calculated as a function of temperature for the transitions of alpha - beta (P = 0) and epsilon-delta(loc)-delta (at constant pressures) in the solid N-2. For this calculation, the observed d...
Observation of in situ enhanced crystallization, negative resistance effect and photosensitivity in Tl2InGaSe4 crystals Qasrawi, A. F.; Irshaid, Tahani M. A.; Hasanlı, Nızamı (Elsevier BV, 2021-02-01) In this work, we report the properties of Tl2InGaSe4 crystals as multifunctional material. Namely, Tl2InGaSe4 crystals are grown by the modified Bridgman method using mixtures of TlInSe2 (50%) and TlGaSe2 (50%) single crys...
3D-graphene-laser patterned p-type silicon Schottky diode Orhan, Elif Oz; Efil, Esra; Bayram, Ozkan; Kaymak, Nuriye; Berberoğlu, Halil; Candemir, Ozun; Pavlov, Ihor; Ocak, Sema Bilge (Elsevier BV, 2021-01-01) © 2020 Elsevier LtdThe influence of the laser patterning (LP) process on the quality of graphene (Gr) film and Schottky diode characteristics was researched in this study. First of all, p-type silicon (Si) was patterned by...
Ultra-thin Al2O3 capped with SiNx enabling implied open-circuit voltage reaching 720mV on industrial p-type Cz c-Si wafers for passivated emitter and rear solar cells Koekbudak, Gamze; Kececi, Ahmet E.; Nasser, Hisham; Turan, Raşit (American Vacuum Society, 2021-01-01) In this study, we report on the passivation quality of atomic layer deposition grown ultra-thin Al2O3 and Al2O3 capped with plasma-enhanced chemical vapor deposition deposited SiNx on Cz p-type wafers for the rear side of ...
Optical characteristics of Bi12SiO20 single crystals by spectroscopic ellipsometry Isik, M.; Delice, S.; Nasser, H.; Hasanlı, Nızamı; Darvishov, N. H.; Bagiev, V. E. (Elsevier BV, 2020-12-01) Structural and optical characteristics of Bi12SiO20 single crystal grown by the Czochralski method were investigated by virtue of X-ray diffraction (XRD) and spectroscopic ellipsometry measurements. XRD analysis indicated ...
Nanosphere Concentrated Photovoltaics with Shape Control Esmaeilzad, Nasim Seyedpour; Demir, Ahmet Kemal; Hajivandi, Jamileh; Ciftpinar, Hande; Turan, Raşit; KURT, HAMZA; Bek, Alpan (2020-12-01) Dielectric colloidal nanospheres (NSs) are promising candidates for light management in photonic devices such as solar cells (SCs). NS arrays can direct the broad incident solar radiation into a set of tighter foci, at whi...
Fano-control of down-conversion in a nonlinear crystal via plasmonic-quantum emitter hybrid structures Artvin, Zafer; Gunay, Mehmet; Bek, Alpan; TAŞGIN, MEHMET EMRE (The Optical Society, 2020-12-01) Control of the nonlinear response of nanostructures via path interference effects, i.e., Fano resonances, has been studied extensively. In such studies, a frequency conversion process takes place near a hot spot. Here, we ...
Interpretation of SARS-CoV-2 behaviour on different substrates and denaturation of virions using ethanol: an atomic force microscopy study ÇELİK, ÜMİT; ÇELİK, KÜBRA; Celik, Suleyman; ABAYLI, HASAN; ŞAHNA, KEZBAN; TONBAK, ŞÜKRÜ; AŞÇI TORAMAN, ZÜLAL; Oral, Ahmet (Royal Society of Chemistry (RSC), 2020-12-01) Coronavirus (SARS-CoV-2) is a respiratory infection virus that was first detected in Wuhan, China. The virus causes COVID-19 disease and the outbreak was recognised as a pandemic by the World Health Organization (WHO) in M...
On the electrical and charge conduction properties of thermally evaporated MoOx on n- and p-type crystalline silicon GÜLNAHAR, MURAT; Nasser, Hisham; Salimi, Arghavan; Turan, Raşit (Springer Science and Business Media LLC, 2020-11-01) In this work, the electrical and charge conduction characteristics of a contact structure featuring thermally evaporated MoOx, deposited on n- and p-type crystalline silicon (c-Si), are extensively investigated by room tem...
Exact formulas for spherical photon orbits around Kerr black holes Tavlayan, Aydın; Tekin, Bayram (American Physical Society (APS), 2020-11-01) Exact formulas relating the radii of the spherical photon orbits to the black hole's rotation parameter and the effective inclination angle of the orbit have been known only for equatorial and polar orbits up to now. Here ...
Temperature-tuned bandgap characteristics of Bi12TiO20 sillenite single crystals Isik, M.; Delice, S.; Hasanlı, Nızamı; Darvishov, N. H.; Bagiev, V. E. (Springer Science and Business Media LLC, 2020-11-01) Bi12MO20 (M: Si, Ge, Ti, etc.) compounds are known as sillenites having fascinating photorefractive characteristics. The present paper reports the structural and optical characteristics of one of the members of this family...
Thermodynamic study on the magnetic transition and structural phase transition in [(CH3)(2)NH2][Na0.5Fe0.5(HCOO)(3)] by using the Landau phenomenological model Yurtseven, Hasan Hamit; Tari, O. (AIP Publishing, 2020-11-01) In this study, we apply the Landau phenomenological model to describe magnetic transition and structural phase transition in a metal formate framework (MOF) of the ferromagnetic [(CH3)(2)NH2][Na0:5Fe0:5(HCOO)(3)], namely, ...
Methylamine terminated molecules on Ni(111): A path to low temperature synthesis of nitrogen-doped graphene Costantini, Roberto; Toffoli, Hande; Feng, Zhijing; Stredansky, Matus; Toffoli, Daniele; Fronzoni, Giovanna; Dri, Carlo; Comelli, Giovanni; Cvetko, Dean; Kladnik, Gregor; Bavdek, Gregor; Floreano, Luca; Morgante, Alberto; Cossaro, Albano (2020-11-01) The thermal treatment of a monolayer of 1-naphthylmethylamine (NMA) on Ni(1 1 1) surface reveals a complex chemistry promoted by the high surface reactivity. Both the amino-terminated functional group and the naphthalene b...
First-Principles Study on Magnetic Nature and Electronic Behavior of Silver-Based Sulfide: Ag3MnS4 Erkişi, Aytaç; Sürücü, Gökhan (2020-11-01) This investigation is about the electronic and magnetic character of the ternary silver-based sulfide (Ag3MnS4) crystallized in sulvanite type crystal structure with space group P4 ̅3m and space number 215. The mentioned c...
Determination of the strong vertices of doubly heavy baryons with pseudoscalar mesons in QCD Alrebdi, H.; Aliev, T. M.; Şimşek, Kağan (American Physical Society (APS), 2020-10-01) The strong coupling constant of doubly heavy baryons with light pseudoscalar mesons pi and K are computed within the light cone sum rules. We take into account two-particle and three-particle distribution amplitudes of the...
Chaos from massive deformations of Yang-Mills matrix models Başkan, K.; Kürkcüoğlu, Seçkin; Oktay, O.; Taşcı, Cankut (Springer Science and Business Media LLC, 2020-10-01) We focus on an SU(N) Yang-Mills gauge theory in 0 + 1-dimensions with the same matrix content as the bosonic part of the BFSS matrix model, but with mass deformation terms breaking the global SO(9) symmetry of the latter t...
Raman bandwidths calculated for the librational ( a -phase) and internal (8, d loc and d phases) modes in solid N 2 using pseudospin-phonon coupling (PS) and energy-fluctuation (EF) models Yurtseven, Hasan Hamit; Akay, O. (Elsevier BV, 2020-10-01) This study gives the calculation of the Raman bandwidths using the models of the pseudospin-phonon coupling (PS) and energy fluctuation (EF) where the Raman frequency calculated from the molecular field theory, is consider...
Towards the fabrication of third generation solar cells on amorphous, flexible and transparent substrates with well-ordered and disordered Si-nanowires/pillars Peksu, Elif; Guller, Ozge; Parlak, Mehmet; Islam, M. Saif; Karaağaç, Hakan (Elsevier BV, 2020-10-01) Si Nanowires (NWs) are typically synthesized on limited substrates that lack essential characteristics, such as mechanical flexibility and optical transparency. Most of the synthesis processes are also costly and inhibit w...