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2D multifunctional SiAs2/GeAs2van der Waals heterostructure.

Leihao Feng1, Xi Zhang1, Quan Zheng1

  • 1College of Physics, Sichuan University, Chengdu, 610065, Sichuan Province, People's Republic of China.

Nanotechnology
|December 15, 2021
PubMed
Summary

This study explores the SiAs₂/GeAs₂ van der Waals heterostructure, finding its tunable electronic properties suitable for optoelectronics. Electric fields can switch its band alignment for diverse device applications.

Keywords:
SiAs2/GeAs2band alignment transitionvan der Waals heterostructure

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Nanotechnology

Background:

  • Two-dimensional (2D) materials offer unique electronic and optical properties.
  • Van der Waals heterostructures (vdWHs) enable novel device functionalities by stacking different 2D materials.
  • SiAs₂/GeAs₂ vdWH presents a promising candidate for advanced electronic and optoelectronic applications.

Purpose of the Study:

  • To investigate the structural and electronic properties of the 2D SiAs₂/GeAs₂ vdWH.
  • To explore its potential applications in light detection, energy harvesting, and light-emitting devices.
  • To demonstrate the tunability of its band alignment for multi-functional applications.

Main Methods:

  • First-principles calculations were employed to determine the fundamental properties.
  • Silvaco Atlas simulations were used to model device behavior.
  • The effects of electric fields and gate voltages on band alignment were analyzed.

Main Results:

  • The stable SiAs₂/GeAs₂ vdWH exhibits an indirect bandgap of 0.99 eV with type II band alignment.
  • An applied electric field can induce a direct bandgap of 0.66 eV and transition the alignment to type I.
  • Band alignment can be reversibly tuned between type II and type I using gate voltage in a field-effect transistor.

Conclusions:

  • The SiAs₂/GeAs₂ vdWH possesses tunable electronic and optoelectronic properties.
  • Its ability to switch band alignment makes it suitable for multi-functional devices.
  • These findings support the potential of SiAs₂/GeAs₂ heterostructures in future electronics and optoelectronics.