Structure-dependent electrical properties of graphene nanoribbon devices with graphene electrodes

Martini, Leonardo; Chen, Zongping; Mishra, Neeraj; Barin, Gabriela Borin; Fantuzzi, Paolo; Ruffieux, Pascal; Fasel, Román; Feng, Xinliang; Narita, Akimitsu; Coletti, Camilla; Müllen, Kläus; Candini, Andrea

doi:10.1016/j.carbon.2019.01.071

Cited by 80 publications

(96 citation statements)

References 49 publications

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“…Modes at energies below the RBLM of a particular GNR have been attributed to the formation of wider GNRs with correspondingly lower RBLM frequency by thermally-induced lateral fusion. 20,21 We can exclude this effect here as we do not reach the temperatures required to induce lateral fusion, nor do we observe them in STM or measure the characteristic series of RBLMs for GNRs of integer multiple widths of the fundamental ribbon. 20 Another low-energy mode is the shear-like mode (SLM), which has been observed in 7-AGNRs and has recently been discussed for 5-AGNRs and 9-AGNRs.…”

Section: A Longitudinal Compressive Mode In Gnrsmentioning

confidence: 99%

A Universal Length-Dependent Vibrational Mode in Graphene Nanoribbons

et al. 2019

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Graphene nanoribbons (GNRs) have attracted considerable interest as their atomically tunable structure makes them promising candidates for future electronic devices.However, obtaining detailed information about the length of GNRs has been challenging and typically relies on low-temperature scanning tunneling microscopy. Such methods are ill-suited for practical device application and characterization. In contrast, Raman spectroscopy is a sensitive method for the characterization of GNRs, in particular for investigating their width and structure. Here, we report on a lengthdependent, Raman active low-energy vibrational mode that is present in atomically precise, bottom-up synthesized armchair graphene nanoribbons (AGNRs). Our Raman study demonstrates that this mode is present in all families of AGNRs and provides information on their length. Our spectroscopic findings are corroborated by scanning tunneling microscopy images and supported by first-principles calculations that allow us to attribute this mode to a longitudinal acoustic phonon. Finally, we show that this mode is a sensitive probe for the overall structural integrity of the ribbons and their interaction with technologically relevant substrates.

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Section: A Longitudinal Compressive Mode In Gnrsmentioning

confidence: 99%

A Universal Length-Dependent Vibrational Mode in Graphene Nanoribbons

et al. 2019

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“…A high I on / I off valued ≈10 5 was measured by using a thin HfO 2 gate dielectric on the FET device (Figure e). Recently, Martini et al comprehensively compared the different device performance among AGNRs with various widths and between GNRs grown by the UHV condition and CVD method . In their study, they demonstrated that the output current mean value from the largest to smallest is 5‐AGNRs, 5 n ‐AGNRs (10‐, 15‐, and 20‐AGNRs), and 9‐AGNRs.…”

Section: Applications Of Gnrs In Electrical Devicesmentioning

confidence: 99%

Modified Engineering of Graphene Nanoribbons Prepared via On‐Surface Synthesis

Zhou

2019

Advanced Materials

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1D graphene nanoribbons (GNRs) have a bright future in the fabrication of next‐generation nanodevices because of their nontrivial electronic properties and tunable bandgaps. To promote the application of GNRs, preparation strategies of miscellaneous GNRs have to be developed. The GNRs prepared by top‐down approaches are accompanied by uncontrolled edges and structures. In order to overcome the difficulties, bottom‐up methods are widely used in the growth of various GNRs due to controllability of GNRs' features. Among those bottom‐up methods, the on‐surface synthesis is a promising approach to prepare GNRs with distinct widths, edge/backbone structures, and so forth. Therefore, modified engineering of the GNRs prepared via on‐surface synthesis is of great significance in controllable preparation of GNRs and their potential applications. In the past decade, there have been a lot of reports on controllable preparation of GNRs using on‐surface synthesis approach. Herein, the advances of GNRs grown via on‐surface growth strategy are described. Several growth parameters, the latest advances in the modification of the GNR structure and width, the GNR doping/co‐doping with heteroatoms, a variety of GNR heterojunctions, and the device application of GNRs are reviewed. Finally, the opportunities and challenges are discussed.

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“…Although the central molecule plays a major role in the transport properties of the molecular device, the electrodes themselves are also fundamentally important for designing new functional organic electronic devices with unique and enhanced performance. Considerable work has shown that a molecular device with zigzag graphene nanoribbon (ZGNR) electrodes behaves in a distinctive manner and exhibits excellent electron transport properties . Thus, we designed our molecular devices with different PAHs by connecting the molecule with ZGNR electrodes to probe their transport properties.…”

Section: Introductionmentioning

confidence: 99%

“…Considerable work has shown that a molecular device with zigzag graphene nanoribbon (ZGNR) electrodes behaves in a distinctive manner and exhibits excellent electron transport properties. [31][32][33][34] Thus, we designed our molecular devices with different PAHs by connecting the molecule with ZGNR electrodes to probe their transport properties. We find that the transport properties of the PAH are strongly dependent on whether there is an even or odd number of benzene rings in the molecule, thereby showing an interesting and novel oddeven effect.…”

Section: Introductionmentioning

confidence: 99%

Odd‐Even Effects on Transport Properties of Polycyclic Arene Molecular Devices with Decreasing Numbers of Benzene Rings

Xia

Yuan

et al. 2020

ChemPhysChem

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The electron transport properties of polycyclic aromatic hydrocarbons (PAHs) with different numbers of benzene rings tethered to narrow zigzag graphene nanoribbon (ZGNR) electrodes have been investigated. Results show that the transport properties of PAHs are dependent on whether the number of benzene rings in the width direction is odd or even. This effect is strong for narrow width PAHs, but its strength decreases as the width of the PAH is increased. PAHs with an odd number of rings exhibit poor transport properties, whereas the ones having an even number of rings show excellent transport properties coupled with a negative differential resistance (NDR) effect. Moreover, the linkage points and the structure of the molecules have a noticeable effect on the transport properties of the PAH, making the odd‐even effect weaker or disappear entirely. Although the PAH with three benzene rings displays poor transport capabilities, it shows excellent rectification behavior compared to the other examined molecules. These studies present a feasible avenue for designing molecular devices with enhanced performance by the careful manipulation of the PAH molecular structure.

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Structure-dependent electrical properties of graphene nanoribbon devices with graphene electrodes

Cited by 80 publications

References 49 publications

A Universal Length-Dependent Vibrational Mode in Graphene Nanoribbons

A Universal Length-Dependent Vibrational Mode in Graphene Nanoribbons

Modified Engineering of Graphene Nanoribbons Prepared via On‐Surface Synthesis

Odd‐Even Effects on Transport Properties of Polycyclic Arene Molecular Devices with Decreasing Numbers of Benzene Rings

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