Research Article

Nano Research

, Volume 3, Issue 6, pp 444-451

Open Access This content is freely available online to anyone, anywhere at any time.

Theoretical and experimental studies of Schottky diodes that use aligned arrays of single-walled carbon nanotubes

  • Xinning HoAffiliated withDepartment of Materials Science and Engineering, Beckman Institute, and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign
  • , Lina YeAffiliated withDepartment of Materials Science and Engineering, Beckman Institute, and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-ChampaignDepartment of Chemistry, University of Science and Technology of China
  • , Slava V. RotkinAffiliated withDepartment of Physics, Lehigh UniversityCentre for Advanced Materials and Nanotechnology, Lehigh University Email author 
  • , Xu XieAffiliated withDepartment of Materials Science and Engineering, Beckman Institute, and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign
  • , Frank DuAffiliated withDepartment of Materials Science and Engineering, Beckman Institute, and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign
  • , Simon DunhamAffiliated withDepartment of Materials Science and Engineering, Beckman Institute, and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-Champaign
  • , Jana ZaumseilAffiliated withCenter for Nanoscale Materials, Argonne National Laboratory
  • , John A. RogersAffiliated withDepartment of Materials Science and Engineering, Beckman Institute, and Frederick Seitz Materials Research Laboratory, University of Illinois at Urbana-ChampaignDepartment of Chemistry, University of Illinois at Urbana-ChampaignDepartment of Electrical and Computer Engineering, Mechanical Science and Engineering, University of Illinois at Urbana-Champaign Email author 

Abstract

We present theoretical and experimental studies of Schottky diodes that use aligned arrays of single-walled carbon nanotubes. A simple physical model, taking into account the basic physics of current rectification, can adequately describe the single-tube and array devices. We show that for as-grown array diodes, the rectification ratio, defined by the maximum-to-minimum-current-ratio, is low due to the presence of metallic-single-walled nanotube (SWNT) shunts. These tubes can be eliminated in a single voltage sweep resulting in a high rectification array device. Further analysis also shows that the channel resistance, and not the intrinsic nanotube diode properties, limits the rectification in devices with channel length up to 10 μm.

Keywords

Schottky diodes aligned arrays single-walled carbon nanotubes