Two-Dimensional Polarized Blue P/SiS Heterostructures as Promising Photocatalysts for Water Splitting.

Area of Science:

• Materials Science
• Physical Chemistry
• Nanotechnology

Background:

• Two-dimensional (2D) polarized heterostructures offer potential for advanced photocatalysis due to internal electric fields.
• Blue Phosphorus (Blue P) and Silicon Sulfide (SiS) are promising 2D materials for heterostructure formation.

Purpose of the Study:

• To investigate the structural, electronic, optical, and photocatalytic properties of Blue P/SiS van der Waals heterostructures.
• To assess the potential of these heterostructures as photocatalysts for water splitting.

Main Methods:

• First-principle calculations were employed to study Blue P/SiS heterostructures with varying stacking interfaces (Si-P and P-S).
• Analysis included structural stability, electronic band structure, optical properties, and internal electric field effects.

Main Results:

• The most stable heterostructures were identified for specific stacking orders (Si-P-2 and P-S-4) with distinct interfaces.
• An internal electric field directed from the 001 surface toward the 001¯ surface was observed, aiding photo-generated charge separation.
• Calculated bandgaps (1.74 eV for Si-P-2, 2.30 eV for P-S-4) and electrostatic potential differences were determined.
• The heterostructures demonstrated suitable band alignment and absorption across a wide ultraviolet and visible light spectrum.

Conclusions:

• 2D polarized Blue P/SiS heterostructures show significant potential as novel photocatalysts.
• Their properties are conducive to efficient water splitting under broad-spectrum illumination.