Please use this identifier to cite or link to this item: https://hdl.handle.net/10356/182285
Title: 2D-penta-PdPS: gate-tunable and thickness-dependent thermoelectric transport
Authors: Yip, Weng Hou
Fu, Qundong
Wang, Xingli
Duan, Ruihuan
Liu, Zheng
Boutchich, Mohamed
Tay, Beng Kang
Keywords: Engineering
Issue Date: 2025
Source: Yip, W. H., Fu, Q., Wang, X., Duan, R., Liu, Z., Boutchich, M. & Tay, B. K. (2025). 2D-penta-PdPS: gate-tunable and thickness-dependent thermoelectric transport. Small, 21(1), e2405645-. https://dx.doi.org/10.1002/smll.202405645
Project: MOE-T2EP50221-0003 
45272 TB
Journal: Small
Abstract: Pentagonal two-dimensional (2D) materials are notable for unique properties derived from their Cairo pentagonal tiling topology. This study explores the thermoelectric potential of exfoliated penta-palladium-phosphorus-sulfur (PdPS) atomic layers, an air-stable 2D semiconductor with a puckered pentagonal low-symmetry structure, grown via chemical vapor transport (CVT). Thickness-dependent in-plane electrical conductivity (σ) and thermoelectric power factor (PF) of PdPS are investigated from 20-380 K, showing an increase in σ with thickness (11, 13, and 88-layer). Applying back-gate voltage (Vg) modulates the Fermi energy (EF), and as Vg decreases, the Seebeck coefficient (S) rises, achieving S of -700 µV K-1 for 11-layer PdPS at -10 V, significantly higher than the -400 µV K-1 for 88-layer PdPS. The PF increased with decreasing thickness, peaking at ≈50 µW m-1 K-2 for 11-layer PdPS, about twice than that of 88-layer PdPS. The high electron mobility (µe) in PdPS is confined to a narrow temperature range, peaking at 300 cm2 Vs-1 at 100 K, marking the transition temperature from ionized impurity scattering to acoustic phonon scattering mechanism, consistent across all layer counts. This work highlights the significant impact of quantum confinement in ultrathin bodies in enhancing thermoelectric performance across a wide temperature range.
URI: https://hdl.handle.net/10356/182285
ISSN: 1613-6810
DOI: 10.1002/smll.202405645
Schools: School of Electrical and Electronic Engineering 
School of Materials Science and Engineering 
Research Centres: Centre for Micro- and Nano-Electronics
CNRS International NTU THALES Research Alliances 
Rights: © 2024 Wiley-VCH GmbH. All rights reserved.
Fulltext Permission: none
Fulltext Availability: No Fulltext
Appears in Collections:EEE Journal Articles

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