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Doping-stabilized two-dimensional black phosphorus.

Xiaoyu Xuan1, Zhuhua Zhang, Wanlin Guo

  • 1State Key Laboratory of Mechanics and Control of Mechanical Structures, Key Laboratory for Intelligent Nano Materials and Devices of Ministry of Education and Institute of Nano Science, Nanjing University of Aeronautics and Astronautics, Nanjing 210016, China. chuwazhang@nuaa.edu.cn wlguo@nuaa.edu.cn.

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Summary
This summary is machine-generated.

Synthesizing two-dimensional black phosphorus (2D BP) is challenging due to its many allotropes. Nitrogen or hole-carrier doping stabilizes 2D BP, while inert substrates enhance this effect, paving the way for its creation.

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Computational Chemistry

Background:

  • Two-dimensional black phosphorus (2D BP) is of significant interest but its synthesis remains elusive.
  • The existence of numerous 2D allotropes with similar energies, particularly 2D blue phosphorus, complicates stabilization.
  • Understanding the factors governing the stability of 2D phosphorus allotropes is crucial for its synthesis.

Purpose of the Study:

  • To investigate methods for stabilizing two-dimensional black phosphorus (2D BP).
  • To identify doping strategies and substrate effects that promote the formation of 2D BP over other allotropes.
  • To elucidate the fundamental mechanisms behind the structural stability of 2D phosphorus.

Main Methods:

  • Density Functional Theory (DFT) calculations were employed to explore various doping strategies and substrate interactions.
  • The energy landscapes of different 2D phosphorus allotropes were analyzed under various conditions.
  • The influence of nitrogen, hole-carrier, and arsenic doping on the stability of 2D BP was computationally assessed.

Main Results:

  • Nitrogen and hole-carrier doping effectively lower the energy of 2D BP, establishing a deep global minimum.
  • Arsenic doping promotes the formation of 2D blue phosphorus due to specific electronic interactions.
  • Inert substrates like graphene and hexagonal boron nitride synergize with doping to enhance 2D BP stability, unlike metal substrates.

Conclusions:

  • Carrier doping, specifically with nitrogen or holes, is a viable strategy to stabilize 2D black phosphorus.
  • The choice of substrate plays a critical role, with inert materials being superior to metallic ones for 2D BP stabilization.
  • These findings provide crucial insights into the stability of 2D phosphorus and offer a promising route for the chemical synthesis of 2D BP.