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2D-Penta-PdPS: Gate-Tunable and Thickness-Dependent Thermoelectric Transport
Weng Hou Yip1, Qundong Fu2,3, Xingli Wang2
1Centre for Micro- and Nano-Electronics (CMNE), School of Electrical and Electronics Engineering, Nanyang Technological University, Singapore, 639798, Singapore.
Small (Weinheim an Der Bergstrasse, Germany)
|November 5, 2024
Summary
This study reveals that ultrathin penta-palladium-phosphorus-sulfur (PdPS) atomic layers exhibit enhanced thermoelectric properties due to quantum confinement effects. Thinner PdPS layers show significantly improved power factors and Seebeck coefficients.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Nanotechnology
Background:
- Pentagonal two-dimensional (2D) materials possess unique properties due to their Cairo pentagonal tiling topology.
- Two-dimensional semiconductors are crucial for advanced electronic and thermoelectric applications.
Purpose of the Study:
- To explore the thermoelectric potential of exfoliated penta-palladium-phosphorus-sulfur (PdPS) atomic layers.
- To investigate the thickness-dependent thermoelectric properties of PdPS and the impact of quantum confinement.
Main Methods:
- Growth of air-stable 2D PdPS atomic layers via chemical vapor transport (CVT).
- Measurement of in-plane electrical conductivity and thermoelectric properties (Seebeck coefficient, power factor) from 20-380 K.
- Investigation of thickness (11, 13, and 88 layers) and back-gate voltage effects on thermoelectric performance.
Main Results:
- Electrical conductivity increased with PdPS layer thickness.
- Seebeck coefficient significantly increased with decreasing thickness, reaching -700 µV K⁻¹ for 11-layer PdPS.
- Power factor peaked at ≈50 µW m⁻² K⁻² for 11-layer PdPS, double that of 88-layer PdPS.
- High electron mobility (µe) was observed, peaking at 300 cm² Vs⁻¹ at 100 K, indicating a transition in scattering mechanisms.
Conclusions:
- Quantum confinement in ultrathin PdPS atomic layers significantly enhances thermoelectric performance.
- Thickness is a critical parameter for optimizing thermoelectric properties in 2D pentagonal materials.
- PdPS demonstrates promising potential for thermoelectric applications, particularly in its thinnest forms.
