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

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.

Resonant tunnelling of wave packet

“…There are ongoing research on RTDs based on heterostructure materials such as the hole-tunneling in Si 0.82 Ge 0.18 Si asymmetric double-quantum-well RTD with suppressed thermionic emission and significant resonance current studied by Shinkawa et al [9]. On the other hand, an interest is growing on the application of RTDs based on graphene nanoribbons structure [10][11][12][13]. In the reference of [10], the authors investigated a novel method of RTDs utilizing antidote-induced armchair graphene nanoribbons (AGN).…”

“…The related study [12] discussed the performance of AGN RTDs enhanced by antidote and boron/nitride atoms doping. An investigation of the square and V shaped potential based on AGN has recently explored by [13] . This study examined how the peak voltage and current depend on barrier and well widths.…”

First-principles study of optical properties of armchair graphene nanoribbons with divacancy defect

“…In 2004, using mechanically exfoliating method, Andre Geim, professor of the university of Manchester in British, and his student KonstantinNovoselov, have first prepared graphene with two dimensional planar structures [1]. Since then, scholars have studied the upsurge of ultra thin graphene because of its fascinating properties [2][3][4]. Its excellent properties, such as high responsivity and ultrafast photodetection [5], super-strong material and thermal conductivity electric and transport properties [6], efficient light emitting devices [7], ect, have been integrated into advanced electronic and photonic devices.…”