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Title: Direct writing of heterostructures in single atomically precise graphene nanoribbons

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 a 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. Finally, our finding demonstrates a feasible strategy to create a double-barrier quantum dot structure with atomic precision for functionalities, such as negative differential resistance devices in GNR-based nanoelectronics.
Authors:
ORCiD logo [1] ;  [2] ; ORCiD logo [3] ; ORCiD logo [1] ;  [4] ; ORCiD logo [1] ; ORCiD logo [3] ;  [4] ; ORCiD logo [1]
  1. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS)
  2. North Carolina State Univ., Raleigh, NC (United States). Dept. of Physics
  3. Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Center for Nanophase Materials Science (CNMS); Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Computational Sciences and Engineering Division
  4. North Carolina State Univ., Raleigh, NC (United States). Dept. of Physics; Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Computational Sciences and Engineering Division
Publication Date:
Grant/Contract Number:
AC05-00OR22725; FG02-98ER45685
Type:
Accepted Manuscript
Journal Name:
Physical Review Materials
Additional Journal Information:
Journal Volume: 3; Journal Issue: 1; Journal ID: ISSN 2475-9953
Publisher:
American Physical Society (APS)
Research Org:
Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY
OSTI Identifier:
1489549
Alternate Identifier(s):
OSTI ID: 1489426

Ma, Chuanxu, Xiao, Zhongcan, Huang, Jingsong, Liang, Liangbo, Lu, Wenchang, Hong, Kunlun, Sumpter, Bobby G., Bernholc, Jerzy, and Li, An-Ping. Direct writing of heterostructures in single atomically precise graphene nanoribbons. United States: N. p., Web. doi:10.1103/PhysRevMaterials.3.016001.
Ma, Chuanxu, Xiao, Zhongcan, Huang, Jingsong, Liang, Liangbo, Lu, Wenchang, Hong, Kunlun, Sumpter, Bobby G., Bernholc, Jerzy, & Li, An-Ping. Direct writing of heterostructures in single atomically precise graphene nanoribbons. United States. doi:10.1103/PhysRevMaterials.3.016001.
Ma, Chuanxu, Xiao, Zhongcan, Huang, Jingsong, Liang, Liangbo, Lu, Wenchang, Hong, Kunlun, Sumpter, Bobby G., Bernholc, Jerzy, and Li, An-Ping. 2019. "Direct writing of heterostructures in single atomically precise graphene nanoribbons". United States. doi:10.1103/PhysRevMaterials.3.016001.
@article{osti_1489549,
title = {Direct writing of heterostructures in single atomically precise graphene nanoribbons},
author = {Ma, Chuanxu and Xiao, Zhongcan and Huang, Jingsong and Liang, Liangbo and Lu, Wenchang and Hong, Kunlun and Sumpter, Bobby G. and Bernholc, Jerzy and Li, An-Ping},
abstractNote = {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 a 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. Finally, our finding demonstrates a feasible strategy to create a double-barrier quantum dot structure with atomic precision for functionalities, such as negative differential resistance devices in GNR-based nanoelectronics.},
doi = {10.1103/PhysRevMaterials.3.016001},
journal = {Physical Review Materials},
number = 1,
volume = 3,
place = {United States},
year = {2019},
month = {1}
}

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