Surface-dominant transport properties in MoSe2 nanosheets

Manickam Anandan, Yu Shin Chang, Chi Yang Chen, Chin Jung Ho, Cheng Maw Cheng, Hung Ru Chen, Tsu Yi Fu, Yu Wen Chu, Kuei Yi Lee, Liang Chiun Chao, Ruei San Chen*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

1 Citation (Scopus)

Abstract

The electronic transport and photoconduction properties of the molybdenum diselenide (MoSe2) nanosheets were investigated. The transfer length method analysis suggests the electric current following an anomalously two-dimensional (2D) flow rather than the general 3D mode. The 2D current implies a higher electron concentration and downward band bending at the surface. A broad spectral photoresponse from ultraviolet to near-infrared wavelengths was also observed for the MoSe2 nanosheets. The optimal responsivity and photoconductive gain respectively at 58 A/W and 179 under the wavelengths at 405 nm were achieved. A surface-controlled photoconduction mechanism based on the surface band bending and electron accumulation is proposed to explain the long carrier lifetime and its dependence of light intensity and environment in MoSe2 nanostructures.

Original languageEnglish
Article number114988
JournalPhysica E: Low-Dimensional Systems and Nanostructures
Volume135
DOIs
Publication statusPublished - 2022 Jan

Keywords

  • Carrier lifetime
  • Field effect transistor
  • Molybdenum diselenide
  • Nanostructure
  • Photoconductivity
  • Surface electron accumulation
  • Transfer length method

ASJC Scopus subject areas

  • Electronic, Optical and Magnetic Materials
  • Atomic and Molecular Physics, and Optics
  • Condensed Matter Physics

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