Controllable electrical properties of metal-doped in2o 3 nanowires for high-performance enhancement-mode transistors

Xuming Zou, Xingqiang Liu, Chunlan Wang, Ying Jiang, Yong Wang, Xiangheng Xiao, Johnny C. Ho, Jinchai Li, Changzhong Jiang, Qihua Xiong, Lei Liao

Research output: Contribution to journalArticlepeer-review

65 Citations (Scopus)

Abstract

In recent years, In2O3 nanowires (NWs) have been widely explored in many technological areas due to their excellent electrical and optical properties; however, most of these devices are based on In 2O3 NW field-effect transistors (FETs) operating in the depletion mode, which induces relatively higher power consumption and fancier circuit integration design. Here, n-type enhancement-mode In2O 3 NW FETs are successfully fabricated by doping different metal elements (Mg, Al, and Ga) in the NW channels. Importantly, the resulting threshold voltage can be effectively modulated through varying the metal (Mg, Ga, and Al) content in the NWs. A series of scaling effects in the mobility, transconductance, threshold voltage, and source-drain current with respect to the device channel length are also observed. Specifically, a small gate delay time (0.01 ns) and high on-current density (0.9 mA/μm) are obtained at 300 nm channel length. Furthermore, Mg-doped In2O3 NWs are then employed to fabricate NW parallel array FETs with a high saturation current (0.5 mA), on/off ratio (>109), and field-effect mobility (110 cm 2/V·s), while the subthreshold slope and threshold voltage do not show any significant changes. All of these results indicate the great potency for metal-doped In2O3 NWs used in the low-power, high-performance thin-film transistors.

Original languageEnglish
Pages (from-to)804-810
Number of pages7
JournalACS nano
Volume7
Issue number1
DOIs
Publication statusPublished - Jan 22 2013
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Engineering(all)
  • Physics and Astronomy(all)

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