Crystal face-dependent nanopiezotronics of an obliquely aligned InN nanorod Array

Nai Jen Ku, Jun Han Huang, Chao Hung Wang, Hsin Chiao Fang, Chuan-Pu Liu

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

This paper proposes an obliquely aligned InN nanorod array to maximize nanorod deformation in the application of nanopiezotronics. The surface-dependent piezotronic I-V characteristics of the InN nanorod array with exposed polar (0002) and semipolar (1̄102) planes were studied by conductive atomic force microscopy. The effects of the piezopotential, created in the InN under straining, and the surface quantum states on the transport behavior of charge carriers in different crystal planes of the InN nanorod were investigated. The crystal plane-dependent electron density in the electron surface accumulation layer and the strain-dependent piezopotential distribution modulate the interfacial contact of the Schottky characteristics for the (0002) plane and the quasi-ohmic behavior for the (1̄102) plane. Regarding the piezotronic properties under applied forces, the Schottky barrier height increases in conjunction with the deflection force with high current density at large biases because of tunneling. The strain-induced piezopotential can thus tune the transport process of the charge carriers inside the InN nanorod over a larger range than in ZnO. The quantized surface electron accumulation layer is demonstrated to modulate the piezopotential-dependent carrier transport at the metal/InN interfaces and become an important factor in the design of InN-based piezotronic devices and nanogenerators.

Original languageEnglish
Pages (from-to)562-568
Number of pages7
JournalNano Letters
Volume12
Issue number2
DOIs
Publication statusPublished - 2012 Feb 8

Fingerprint

Nanorods
nanorods
Crystals
crystals
Charge carriers
charge carriers
Carrier transport
Electrons
Carrier concentration
high current
deflection
Atomic force microscopy
electrons
Current density
Metals
atomic force microscopy
current density
metals

All Science Journal Classification (ASJC) codes

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

Cite this

Ku, Nai Jen ; Huang, Jun Han ; Wang, Chao Hung ; Fang, Hsin Chiao ; Liu, Chuan-Pu. / Crystal face-dependent nanopiezotronics of an obliquely aligned InN nanorod Array. In: Nano Letters. 2012 ; Vol. 12, No. 2. pp. 562-568.
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Crystal face-dependent nanopiezotronics of an obliquely aligned InN nanorod Array. / Ku, Nai Jen; Huang, Jun Han; Wang, Chao Hung; Fang, Hsin Chiao; Liu, Chuan-Pu.

In: Nano Letters, Vol. 12, No. 2, 08.02.2012, p. 562-568.

Research output: Contribution to journalArticle

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