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Bulunan: 18 Adet 0.002 sn
Tam Metin : yok ✕İlgili Araştırmacılar : Serhan YAMAÇLI ✕
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Prof. Dr. Serhan YAMAÇLIElektrik-Elektronik Mühendisliği
Erişime Açık

Investigation and comparison of the large-signal characteristics anddynamical parameters of silicene and germanene nanoribbon interconnects

Serhan YAMAÇLI

One dimensional materials such as nanotubes and nanoribbons are studied widely in the literature for their peculiar properties. In particular, zigzag graphene and silicene nanoribbons constitute an active research area for the possibility to use them as interconnects. Recently, it is exposed that asymmetric zigzag germanene nanoribbons also show similar metallic characteristics. In this work, the electronic transport properties and dynamical parameters of zigzag silicene and germanene nanoribbons (ZZ-SiNR and ZZ-GeNR) are investigated and compared. First-principles quantum mechanical simulatio ...Daha fazlası

Makale/Derleme 2018 Computational Materials Science 8 Görüntülenme
Erişime Açık

Comparison of the terahertz and optical characteristics of graphene and silicene nanoribbons utilizing first-principles approach

Serhan YAMAÇLI

Optical applications of graphene and related two-dimensional materials are continuously taking interest. In this study, accurate first-principles simulations are utilized for obtaining the terahertz and optical characteristics of realistic graphene and silicene nanoribbons (GNRs and SiNRs). Density functional theory is used for calculating the electron density and then Kubo-Greenwood formalism is applied for the computation and comparison of the complex dielectric functions of equivalent GNR and SiNR samples, which are found to be consistent with the previous results in the literature. Frequen ...Daha fazlası

Makale/Derleme 2016 Journal of Optoelectronics and Advanced Materials 10 Görüntülenme
Erişime Açık

Observation of negative differential resistance in mesoscopicgraphene oxide devices

Serhan YAMAÇLI

The fractions of various functional groups in graphene oxide (GO) are directly related to its electrical and chemical properties and can be controlled by various reduction methods like thermal, chemical and optical. However, a method with sufcient controllability to regulate the reduction process has been missing. In this work, a hybrid method of thermal and joule heating processes is demonstrated where a progressive control of the ratio of various functional groups can be achieved in a localized area. With this precise control of carbon-oxygen ratio, negative diferential resistance (NDR) is o ...Daha fazlası

Makale/Derleme 2018 Scientific Reports 11 Görüntülenme
Erişime Açık

Modulation of the electronic transport properties of silicon nanotubesvia hydrogenation ratio

Serhan YAMAÇLI

In this work, electronic transport properties of hydrogenated silicon nanotubes (SiNTs) are studied using first-principles methods. Metallic (4, 4) and (7, 7) SiNTs are simulated using density functional theory combined with non-equilibrium Green's function formalism. The current–voltage characteristics of these nanotubes are obtained for various hydrogenation ratios considering that hydrogenation provides stability to SiNT structures as studied in the literature. The transmission spectra of the investigated SiNT structures are also given and discussed in order to analyse and extend the obtain ...Daha fazlası

Makale/Derleme 2016 Materials Research Express 10 Görüntülenme
Erişime Açık

Investigation and comparison of bare-dihydrogenated junction rectifiers of graphene and silicene nanoribbons

Serhan YAMAÇLI

Although silicon and similar bulk materials are widely used in today’s integrated circuits, the transition to lower dimensional structures such as two-dimensional graphene, one-dimensional graphene nanoribbons (GNRs) and silicene nanoribbons (SiNRs) seems inescapable due to the increment of inelastic scattering and related performance degrading effects in bulk circuit components. In this context, GNRs and SiNRs provide advantages such as low area consumption and the adjustment of their electronic behaviours by edge states and widths. On the other hand, rectifiers together with their static and ...Daha fazlası

Makale/Derleme 2016 Journal of Computational Electronics 7 Görüntülenme
Erişime Açık

Comparison of the electronic transport properties of metallic graphene and silicene nanoribbons

Serhan YAMAÇLI

Carbon-based materials such as carbon nanotubes and graphene nanoribbons are investigated extensively for the near future nanoelectronics technology. Considering the expertise on the processing of silicon, various implementations of silicon counterparts of these nanoscale components such as silicon nanotubes and silicene nanoribbons have also been reported recently. In this work, electronic transport properties of metallic graphene and silicene nanoribbons (GNRs and SiNRs) are compared. Ab initio simulations based on density functional theory combined with non-equilibrium Green’s function form ...Daha fazlası

Makale/Derleme 2015 Journal of Nanoparticle Research 18 Görüntülenme
Erişime Açık

Investigation of the voltage-dependent transport properties of metallic silicon nanotubes (SiNTs): A first-principles study

Serhan YAMAÇLI

Considering that the current microelectronics technology is built upon silicon, various nanoscale silicon structures are being investigated. In this study, voltage-dependent transmission characteristics of short silicon nanotubes (SiNTs) are investigated using first-principles methods. Density functional theory in conjunction with non-equilibrium Green’s function formalism is utilized to simulate metallic (5, 5) and (8, 8) SiNTs in order to obtain their current–voltage characteristics. The variation of the SiNT resistance with the applied voltage is also given and discussed together with the c ...Daha fazlası

Makale/Derleme 2014 Computational Materials Science 8 Görüntülenme
Erişime Açık

Voltage-dependent parameter extraction for graphene nanoribbon interconnect model through ab initio approach

Serhan YAMAÇLI

This paper presents electrical parameter extraction for metallic graphene nanoribbon (GNR) interconnects utiliz- ing ab initio approach. Unlike the studies taking the kinetic inductance, quantum capacitance and Fermi velocity as constant values, voltage-dependencies of these parameters are obtained for GNR transmission line model. The variations of the kinetic energy and the current by the applied voltage are taken as bases for voltage-dependent kinetic inductance calculation. Quantum capacitance and the Fermi velocity are also computed from the kinetic inductance variation. It is concluded th ...Daha fazlası

Makale/Derleme 2014 Thin Solid Films 5 Görüntülenme
Erişime Açık

Algebraic Current-voltage and Voltage Dependent Resistance Expressions for Ballistic Nano Conductors and Their Low Voltage Nonlinearity

Serhan YAMAÇLI

In this study, an algebraic current-voltage (I-V ) equation suitable for the hand-calculation of ballistic nano conductors is derived from Landauer’s formulation. A voltage and temperature dependent resistance expression is also obtained. It is shown that the presented algebraic I-V expression and the original Landauer’s formula give the same characteristics as expected. Moreover, the I-V characteristics of ballistic nano conductors are investigated and it is concluded that there is an inescapable nonlinearity originating from the curvature of Fermi-Dirac distribution function in low voltage r ...Daha fazlası

Makale/Derleme 2013 Nano-Micro Letters 16 Görüntülenme
Erişime Açık

Accurate SPICE compatible CNT interconnect and CNTFET models for circuit design and simulation

Serhan YAMAÇLI

SPICE compatible CNT interconnect and CNTFET models in Verilog-A hardware description language are presented in this paper. Metallic CNTs are shown to have current saturation characteristics above a threshold voltage and then modelled with piecewise linear functions. On the other hand, the CNTFET model developed utilizes the calculation of the self-consistent potential of the CNT channel depending on gate and drain voltages. Unlike the previous SPICE-enabled CNTFET models using approximations and curve fittings, the proposed model employs a self-consistent method for the calculation of the cha ...Daha fazlası

Makale/Derleme 2013 Mathematical and Computer Modelling 8 Görüntülenme
Erişime Açık

Effects of soybean biodiesel on engine vibration and noise emission

Serhan YAMAÇLI

In this study, an algebraic current-voltage (I-V ) equation suitable for the hand-calculation of ballistic nano conductors is derived from Landauer’s formulation. A voltage and temperature dependent resistance expression is also obtained. It is shown that the presented algebraic I-V expression and the original Landauer’s formula give the same characteristics as expected. Moreover, the I-V characteristics of ballistic nano conductors are investigated and it is concluded that there is an inescapable nonlinearity originating from the curvature of Fermi-Dirac distribution function in low voltage r ...Daha fazlası

Makale/Derleme 2012 Energy Education Science and Technology Part A: Energy Science and Research 11 Görüntülenme
Erişime Açık

Beginner`s guide to iOS 13 app development using swiftUI and UIKit

Serhan YAMAÇLI

The author assumes you have no experience in appdevelopment. The book starts with the installation of the required programmingenvironment and setting up the simulators. Then, the simplest Hello World appis developed step by step. In the next chapter, basics of the Swift 5.1programming language are given with practical examples. Screenshots and codesnippets are clearly given in the book to guide the reader. After the Swiftlecture, 8 complete apps (including a 2D game in SpriteKit and a 3D game inSceneKit) are developed in separate chapters. Both the mature UIKit and thenewest SwiftUI frameworks ...Daha fazlası

Kitap 2020 Beginner`s guide to iOS 13 app development using swiftUI and UIKit 18 Görüntülenme
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