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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Semiconductor Device Physics

Background:

  • Two-dimensional (2D) materials are crucial for beyond-silicon electronics.
  • Bismuth oxyselenide (Bi2O2Se) shows promise due to high electron mobility and a native high-k dielectric.
  • Fabricating p-type 2D Bi2O2Se transistors is a significant challenge.

Purpose of the Study:

  • To develop an area-selective, low-temperature doping method for Bi2O2Se thin films.
  • To enable the modulation of carrier polarity in 2D Bi2O2Se.
  • To demonstrate the fabrication of p-type Bi2O2Se devices and p-n homojunctions.

Main Methods:

  • Utilized pulsed laser deposition for Bi2O2Se thin film fabrication.
  • Employed an area-selective doping strategy introducing Zn2+ substitutional dopants at ~600 K.
  • Compatible with back-end-of-line processes for integrated circuit manufacturing.

Main Results:

  • Achieved area-selective doping of Bi2O2Se thin films at low temperatures.
  • Successfully modulated carrier polarity, enabling p-type conductivity.
  • Demonstrated a 2D vertical p-n homojunction with a photoresponse on/off ratio of ~10^6.
  • Fabricated planar transistors utilizing p-doped Bi2O2Se homojunctions.

Conclusions:

  • The developed low-temperature doping method overcomes challenges in p-type Bi2O2Se fabrication.
  • This technique facilitates the creation of advanced 2D electronic devices, including p-n homojunctions.
  • Promotes the application of Bi2O2Se in next-generation electronic technologies.