Direct writing of heterostructures in single atomically precise graphene nanoribbons

Abstract

Precision control of interfacial structures and electronic properties is the key to the realization of functional heterostructures. Here, utilizing the scanning tunneling microscope (STM) both as a manipulation and characterization tool, we demonstrate the fabrication of a heterostructure in a single atomically precise graphene nanoribbon (GNR) and report its electronic properties. The heterostructure is made of a seven-carbon-wide armchair GNR and a lower band gap intermediate ribbon synthesized bottom-up from a molecular precursor on an Au substrate. The short GNR segments are directly written in the ribbon with an STM tip to form atomic precision intraribbon heterostructures. Based on STM studies combined with density functional theory calculations, we show that the heterostructure has a type-I band alignment, with manifestations of quantum confinement and orbital hybridization. Our finding demonstrates a feasible strategy to create a double barrier quantum dot structure with atomic precision for novel functionalities, such as negative differential resistance devices in GNR-based nanoelectronics.

arXiv comment17 pages, 6 figures

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• Quantum ESPRESSO: a modular and open-source software project for quantum simulations of materials
• On-surface synthesis of graphene nanoribbons with zigzag edge topology
• Giant edge state splitting at atomically precise zigzag edges
• Quasi one-Dimensional Band Dispersion and Metallization In long Range Ordered Polymeric wires
• Negative differential resistances with back gate-controlled lowest operation windows in graphene double barrier resonant tunneling diodes
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Cited by in corpus (5)

• Atomic-scale manipulation and in situ characterization with scanning tunneling microscopy
• Engineered electronic states in atomically precise artificial lattices and graphene nanoribbons
• Electronic transport across quantum dots in graphene nanoribbons: Toward built-in gap-tunable metal-semiconductor-metal heterojunctions
• Electrically Induced Dirac Fermions in Graphene Nanoribbons
• Quantum Electronic Transport Across "Bite" Defects in Graphene Nanoribbons