All-carbon molecular tunnel junctions

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Journal titleJournal of the American Chemical Society
Pages1916819177; # of pages: 10
SubjectConventional microelectronics; Covalent bonding; Disordered carbon; Enhanced stability; High yield; In-vacuum; J-V characteristics; Molecular electronic junction; Molecular junction; Molecular layer; Organic molecules; Reproducibilities; Top contact; Contacts (fluid mechanics); Current density; Display devices; Electromigration; Microelectronics; Molecular electronics; Tunnel junctions; Carbon; carbon; copper; molecular layer; article; chemical structure; conductor; covalent bond; electrochemical analysis; molecular electronics; oxidation; physical chemistry; temperature; thermostability; vacuum; Benzene Derivatives; Carbon; Copper; Electrons; Molecular Structure
AbstractThis Article explores the idea of using nonmetallic contacts for molecular electronics. Metal-free, all-carbon molecular electronic junctions were fabricated by orienting a layer of organic molecules between two carbon conductors with high yield (>90%) and good reproducibility (rsd of current density at 0.5 V <30%). These all-carbon devices exhibit current density-voltage (J-V) behavior similar to those with metallic Cu top contacts. However, the all-carbon devices display enhanced stability to bias extremes and greatly improved thermal stability. Completed carbon/nitroazobenzene(NAB)/carbon junctions can sustain temperatures up to 300 °C in vacuum for 30 min and can be scanned at ±1 V for at least 1.2 × 10 9 cycles in air at 100 °C without a significant change in J-V characteristics. Furthermore, these all-carbon devices can withstand much higher voltages and current densities than can Cu-containing junctions, which fail upon oxidation and/or electromigration of the copper. The advantages of carbon contacts stem mainly from the strong covalent bonding in the disordered carbon materials, which resists electromigration or penetration into the molecular layer, and provides enhanced stability. These results highlight the significance of nonmetallic contacts for molecular electronics and the potential for integration of all-carbon molecular junctions with conventional microelectronics. © 2011 American Chemical Society.
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AffiliationNational Research Council Canada (NRC-CNRC); National Institute for Nanotechnology (NINT-INNT)
Peer reviewedYes
NPARC number21271179
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Record identifiercbc79e67-25c6-4502-94ac-37486fb6f0a6
Record created2014-03-24
Record modified2017-03-23
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