Nonlinear transverse current response in zigzag graphene nanoribbons

Wang, Bo; Ma, Zhongshui; Zhang, Chaofeng

doi:10.1063/1.3647783

Cited by 2 publications

(1 citation statement)

References 34 publications

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“…The other semiconducting structures show non-linear characteristics, such as the conduction and valence bands being separated by smaller bandgaps, and the electron transport properties can be modulated by shifting the Fermi level towards the electron and hole energy bands with applied bias voltage at the terminals. A similar type of non-linear current voltage characteristics of ZGNR is also reported in other experiments as well, supporting our theory [75,76].…”

Section: Resultssupporting

confidence: 92%

Performance analysis of carbon nanotube and graphene nanoribbon based biochemical sensors at atomic scale

Bhat,

Ghosh

2024

J. Phys. D: Appl. Phys.

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Advancements in fabrication technologies have led to the possibility for synthesizing atomic scale structures of graphene nanoribbon (GNR) and carbon nanotube (CNT) based nanodevices. The purpose of this study is to model the electronic properties and electrical characteristics of these devices by atomistic modelling using density functional theory (DFT) and non-equilibrium Green’s function (NEGF) and compare the effects of molecular functionalization and sensing. Potential profile of the device is computed using three dimensional Poisson’s equation for smaller applied bias within 1 voltage range. Simulation showed a bandgap of 1eV for armchair GNR (AGNR), which exhibited insensitive behaviour to functionalized amine molecule resulting in lesser alteration in the density of states (DoS), transmission spectra and the device current (ΔI). The bandgap further increased to 2eV on rolling the GNR to armchair CNT (ACNT) which further deteriorated the sensitivity. However, changing the configuration of AGNR to zigzag GNR (ZGNR) shows remarkable alteration in the DoS and transmission spectra and significant improvement in sensitivity. This further improves to 1.5 - 2 times as the ZGNR is rolled to zigzag CNT (ZCNT). Thus, at lower dimensions in atomic scale, we found the alteration in device current of the carbon structures which is directly proportional to the sensitivity in the following order: ΔIACNT < ΔIAGNR < ΔIZGNR < ΔIZCNT. However, the same is found to fall for ZGNR and ZCNT with increase in width to length (W/L) ratio. This specifies the importance of smaller atomic structures and the work provides a guideline for effectively utilization these structures for biochemical sensing.

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Section: Resultssupporting

confidence: 92%

Performance analysis of carbon nanotube and graphene nanoribbon based biochemical sensors at atomic scale

Bhat,

Ghosh

2024

J. Phys. D: Appl. Phys.

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Achieving high power factor and thermoelectric performance through dual substitution of Zn and Se in tetrahedrites Cu12Sb4S13

Zhu

Ming

Huang

et al. 2019

Applied Physics Letters

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As an environmentally friendly thermoelectric material with its constituents being free of Pb/Te, tetrahedrite Cu12Sb4S13 absorbs much research interest. However, its low thermoelectric performance inhibits its applications. Here, we show that through dual substitution of Se for S and Zn for Cu in the compound, both the electrical conductivity and the thermopower are enhanced, leading to the elevation of the power factor as high as ∼33% (at 723 K). Analyses indicate that the substitution of Se for S gives rise to changes in stoichiometry of Cu12Sb4S13 through precipitation of impurity phase Cu3SbS4, which causes variations of S vacancies and hole concentrations, while Zn2+ substitution for Cu1+ introduces donors, both of which tune and optimize the carrier concentration. Besides, the lattice thermal conductivity of dual substituted samples is reduced by as low as ∼30% (at 723 K) due to intensified phonon scattering of the impurities (Se and Zn). As a result, a large figure of merit ZT = 0.9 (at 723 K) is achieved in Cu12−yZnySb4S12.8Se0.2 samples with y = 0.025 and 0.05, which is ∼41% higher than that of pristine tetrahedrite Cu12Sb4S13, indicating that dual substitution is an effective approach to improving its thermoelectric performance.

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Nonlinear transverse current response in zigzag graphene nanoribbons

Cited by 2 publications

References 34 publications

Performance analysis of carbon nanotube and graphene nanoribbon based biochemical sensors at atomic scale

Performance analysis of carbon nanotube and graphene nanoribbon based biochemical sensors at atomic scale

Achieving high power factor and thermoelectric performance through dual substitution of Zn and Se in tetrahedrites Cu12Sb4S13

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