Theoretical study on high-frequency graphene-nanoribbon heterojunction backward diode

Abstract

We propose and analyze a heterojunction backward diode for millimeter- or terahertz-wave detection using edge-modified graphene nanoribbons (GNRs). According to the electron-affinity difference between a hydrogen-terminated GNR and a fluorine-terminated GNR, it is possible to construct a staggered-type lateral heterojunction diode. First-principles calculations reveal that because of band-to-band tunneling, the diode has a nonlinear current of the order of kA/m. The small junction area contributes to the reduction of the intrinsic junction capacitance. Equivalent-circuit analyses show that when the total capacitance is reduced below 100 aF, the diode exhibits a voltage sensitivity of 3.79 × 103 V/W at 300 GHz.

Interpolymer Self-Assembly of Bottom-up Graphene Nanoribbons Fabricated from Fluorinated Precursors

“…24 GNRs are a promising candidate for future applications in electronic devices. For instance, it has been predicted that subnanometer-wide GNRs can make excellent high-frequency devices, 25 such as backward diodes, 26 because of their small junction capacitance. Moreover, numerical simulations show that GNR field-effect transistors (FET) prevail in performance over conventional silicon MOSFET devices.…”

Electrically Doped Nanoscale Devices Using First-Principle Approach: A Comprehensive Survey

“…Some of these biomolecular devices have already been introduced in the arena of biomedicine. The theoretical design of these nanodevices has been implemented using the Atomistix-Tool Kit and Virtual Nano Laboratory (ATK-VNL)-based Quantumwise software simulator version 13.8.0 [69][70][71][72][73][74][75][76]. Even Quantum Cellular Automata (QCA) logic can be theoretically implemented using DFT and NEGF-based first-principle approach [77].…”

On-surface synthesis of hydroxy-functionalized graphene nanoribbons through deprotection of methylenedioxy groups

“…The GNR BWDs with GNR heterojunction in the channel, in which one side of GNR's edges is terminated by hydrogen while the other side is terminated by fluorine, can outperform the state-of-the-art diodes made from compound semiconductors. 16 While the simulated performance is promising, there are a couple of significant challenges in the experimental study of GNR devices. [17][18][19][20][21][22] A widely-recognized challenge is fabricating sufficiently-long GNRs with a moderate band gap.…”