Hierarchical Phosphorene Growth Pathway Mediated by Competing P-Cu and P-P Interactions

Area of Science:

• Materials Science
• Surface Science
• Condensed Matter Physics

Background:

• Blue phosphorene (BlueP) has emerged as a promising 2D material with unique electronic properties.
• Previous studies demonstrated BlueP synthesis on Cu(111), but the underlying growth mechanism remained unclear due to strong phosphorus-copper (P-Cu) interactions.

Purpose of the Study:

• To elucidate the hierarchical growth pathway and dominant interactions during blue phosphorene formation on Cu(111).
• To establish a universal kinetic pathway for synthesizing non-van der Waals 2D materials on reactive metal surfaces.

Main Methods:

• Utilized scanning tunneling microscopy (STM) to observe the growth process at the atomic level.
• Analyzed the evolution of surface structures and bonding configurations with increasing phosphorus coverage.

Main Results:

• Identified a hierarchical growth pathway driven by competing P-Cu and phosphorus-phosphorus (P-P) interactions.
• Observed a transition from P clusters and distorted chains at low coverage to ultra-flat 1 × 1 BlueP at saturation.
• Demonstrated a decrease in interfacial charge transfer and strengthening of P-P bonding energy with increasing coverage, indicating a shift from substrate-dominated to intralayer bonding.

Conclusions:

• The growth of BlueP on Cu(111) is governed by a coverage-dependent reversal of interaction hierarchy.
• This detailed understanding provides a universal kinetic pathway for fabricating other 2D materials on reactive substrates.
• The findings pave the way for controlled synthesis of novel 2D materials with tailored properties.