Adsorption Site of Gas Molecules on Defective Armchair Graphene Nanoribbon Formed Through Ion Bombardment

2017 ◽  
Vol 47 (2) ◽  
pp. 1208-1217 ◽  
Author(s):  
Zuriana Auzar ◽  
Zaharah Johari ◽  
S. H. Sakina ◽  
N. Ezaila Alias
Keyword(s):  
Ion Bombardment ◽  
Graphene Nanoribbon ◽  
Adsorption Site ◽  
Gas Molecules ◽  
Armchair Graphene Nanoribbon ◽  
Armchair Graphene

scholarly journals Electronic Structure Calculation of Adsorbate Gas Molecules on an Armchair Graphene Nanoribbon

2012 ◽  
Vol 2012 ◽  
pp. 1-5 ◽  
Author(s):  
Khadije Imani ◽  
Gholamhossein Jafari ◽  
Mohammad Reza Abolhasani
Keyword(s):  
Adsorbed Molecule ◽  
Graphene Nanoribbon ◽  
Structure Calculation ◽  
Localized States ◽  
First Principle ◽  
Type Semiconductor ◽  
Gas Molecules ◽  
Adsorption Energies ◽  
Armchair Graphene Nanoribbon ◽  
Armchair Graphene

By using the first-principle methods, we have investigated the adsorption of the CO, CO2, NO, and NH3 molecules on an armchair graphene nanoribbon (AGNR). The optimal adsorption positions and orientations of these molecules on AGNR are determined. The adsorption energies, the charge transfer, and the density of states (DOS) are obtained. The NO, CO, and CO2 adsorbed molecules act as an acceptor, and the NH3 adsorbed molecule acts as a donor. The NO and CO molecules contributed with localized states in the center of the original band gap. But the system exhibits -type or -type semiconductor after NH3 or CO2 adsorption.

Electron Tunneling Current in an n-p-n Bipolar Transistor Based on Armchair Graphene Nanoribbon by Using Airy-Wavefunction Approach

2015 ◽  
Vol 1112 ◽  
pp. 80-84
Author(s):  
Fatimah A. Noor ◽  
Rifky Syariati ◽  
Endi Suhendi ◽  
Mikrajuddin Abdullah ◽  
Khairurrijal
Keyword(s):  
Electron Tunneling ◽  
Tunneling Current ◽  
Band Gap Energy ◽  
Graphene Nanoribbon ◽  
Bipolar Transistor ◽  
Electron Effective Mass ◽  
Collector Voltage ◽  
Armchair Graphene Nanoribbon ◽  
Armchair Graphene ◽  
Emitter Voltage

We have developed a model of the tunneling current in n-p-n bipolar transistor based on armchair graphene nanoribbon (AGNR). Airy-wavefunction approach is employed to obtain electron transmittance, and the obtained transmittance is then used to obtain the tunneling current. The tunneling current is calculated for various variables such as base-emitter voltage, base-current voltage, and AGNR width. It is found that the tunneling current increases with increasing the base-emitter voltage or the base-collector voltage. This result is due to the lowered barrier height of the base region caused by the increase in the base-emitter voltage or the base-collector voltage. In addition, the tunneling current density increases with the width for narrow AGNR and, on the other hand, it decreases for wide AGNR. This finding might be due to the contributions of the band gap energy and the electron effective mass of AGNR which are inversely proportional to the AGNR width.

scholarly journals Modeling of Electron Tunneling Current in a p-n Junction Based on Strained Armchair Graphene Nanoribbon

2014 ◽  
Vol 4 (4) ◽  
pp. 259-262
Author(s):  
Rifky Syariati ◽  
◽  
Endi Suhendi ◽  
Fatimah A. Noor ◽  
Mikrajuddin Abdullah ◽  
...  
Keyword(s):  
Electron Tunneling ◽  
Tunneling Current ◽  
Graphene Nanoribbon ◽  
Armchair Graphene Nanoribbon ◽  
Armchair Graphene

Performance enhancement of armchair graphene nanoribbon resonant tunneling diode using V-shaped potential well

2021 ◽  
Author(s):  
Madhusudan Mishra ◽  
N R Das ◽  
Narayan Sahoo ◽  
Trinath Sahu
Keyword(s):  
Resonant Tunneling ◽  
Resonant Tunneling Diode ◽  
Graphene Nanoribbon ◽  
Potential Well ◽  
High Frequency Signal ◽  
Peak Voltage ◽  
Voltage Range ◽  
Tunneling Diode ◽  
Armchair Graphene Nanoribbon ◽  
Armchair Graphene

Abstract We study the electron transport in armchair graphene nanoribbon (AGNR) resonant tunneling diode (RTD) using square and V-shaped potential well profiles. We use non-equilibrium Green’s function formalism to analyze the transmission and I-V characteristics. Results show that an enhancement in the peak current (Ip ) can be obtained by reducing the well width (Ww ) or barrier width (Wb ). As Ww decreases, Ip shifts to a higher peak voltage (Vp ), while there is almost no change in Vp with decreasing Wb . It is gratifying to note that there is an enhancement in Ip by about 1.6 times for a V-shaped well over a square well. Furthermore, in the case of a V-shaped well, the negative differential resistance occurs in a shorter voltage range, which may beneficial for ultra-fast switching and high-frequency signal generation. Our work anticipates the suitability of graphene, having better design flexibility, to develop ideally 2D RTDs for use in ultra-dense nano-electronic circuits and systems.

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