Centimeter-Scale Few-Layer PdS₂: Fabrication and Physical Properties.

Area of Science:

• Materials Science
• Condensed Matter Physics
• Nanotechnology

Background:

• Novel semiconductive materials are crucial for advancing electronic devices.
• Transition metal dichalcogenides (TMDs) are promising candidates for next-generation electronics.
• Palladium disulfide (PdS2), a group-10 TMD, exhibits unique layer-dependent electronic properties and high carrier mobility.

Purpose of the Study:

• To achieve large-scale synthesis of few-layer PdS2.
• To investigate the optical and electronic properties of few-layer PdS2.
• To explore the potential of PdS2 for high-performance opto-electronic applications.

Main Methods:

• Centimeter-scale synthesis of few-layer PdS2 using combined physical vapor deposition (PVD) and chemical vapor deposition (CVD).
• Angle-resolved polarized Raman spectroscopy to study optical anisotropic properties.
• Fabrication and characterization of field-effect transistor (FET) devices to evaluate electronic properties.
• Density functional theory (DFT) calculations to understand electronic structure.

Main Results:

• Successful centimeter-scale synthesis of few-layer PdS2.
• First-time investigation of optical anisotropic properties and temperature-dependent Raman spectra (12-300 K).
• PdS2 FETs demonstrated tunable ambipolar transport with high field-effect mobility (∼388 cm2 V−1 s−1) and on/off ratio (∼800).

Conclusions:

• Few-layer PdS2 possesses excellent electronic and optical properties.
• The demonstrated synthesis and characterization pave the way for PdS2 in advanced electronic applications.
• PdS2 is a promising material for developing high-performance opto-electronic devices.