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Zheng S, Xiao S, Peng K, Pan Y, Yang X, Lu X, Han G, Zhang B, Zhou Z, Wang G, Zhou X. Symmetry-Guaranteed High Carrier Mobility in Quasi-2D Thermoelectric Semiconductors. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2023; 35:e2210380. [PMID: 36527338 DOI: 10.1002/adma.202210380] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/08/2022] [Revised: 12/07/2022] [Indexed: 06/17/2023]
Abstract
Quasi-2D semiconductors have garnered immense research interest for next-generation electronics and thermoelectrics due to their unique structural, mechanical, and transport properties. However, most quasi-2D semiconductors experimentally synthesized so far have relatively low carrier mobility, preventing the achievement of exceptional power output. To break through this obstacle, a route is proposed based on the crystal symmetry arguments to facilitate the charge transport of quasi-2D semiconductors, in which the horizontal mirror symmetry is found to vanish the electron-phonon coupling strength mediated by phonons with purely out-of-plane vibrational vectors. This is demonstrated in ZrBeSi-type quasi-2D systems, where the representative sample Ba1.01 AgSb shows a high room-temperature hole mobility of 344 cm2 V-1 S-1 , a record value among quasi-2D polycrystalline thermoelectrics. Accompanied by intrinsically low thermal conductivity, an excellent p-type zT of ≈1.3 is reached at 1012 K, which is the highest value in ZrBeSi-type compounds. This work uncovers the relation between electron-phonon coupling and crystal symmetry in quasi-2D systems, which broadens the horizon to develop high mobility semiconductors for electronic and energy conversion applications.
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Affiliation(s)
- Sikang Zheng
- College of Physics and Center of Quantum Materials & Devices, Chongqing University, Chongqing, 401331, P. R. China
| | - Shijuan Xiao
- College of Physics and Center of Quantum Materials & Devices, Chongqing University, Chongqing, 401331, P. R. China
| | - Kunling Peng
- Interdisciplinary Center for Fundamental and Frontier Sciences, Nanjing University of Science and Technology, Jiangyin, 214443, P. R. China
| | - Yu Pan
- Max Planck Institute for Chemical Physics of Solids, 01187, Dresden, Germany
| | - Xiaolong Yang
- College of Physics and Center of Quantum Materials & Devices, Chongqing University, Chongqing, 401331, P. R. China
| | - Xu Lu
- College of Physics and Center of Quantum Materials & Devices, Chongqing University, Chongqing, 401331, P. R. China
| | - Guang Han
- College of Materials Science and Engineering and Center of Quantum Materials & Devices, Chongqing University, Chongqing, 401331, P. R. China
| | - Bin Zhang
- College of Physics and Center of Quantum Materials & Devices, Chongqing University, Chongqing, 401331, P. R. China
- Analytical and Testing Center, Chongqing University, Chongqing, 401331, P. R. China
| | - Zizhen Zhou
- College of Physics and Center of Quantum Materials & Devices, Chongqing University, Chongqing, 401331, P. R. China
| | - Guoyu Wang
- College of Materials Science and Engineering and Center of Quantum Materials & Devices, Chongqing University, Chongqing, 401331, P. R. China
| | - Xiaoyuan Zhou
- College of Physics and Center of Quantum Materials & Devices, Chongqing University, Chongqing, 401331, P. R. China
- Analytical and Testing Center, Chongqing University, Chongqing, 401331, P. R. China
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Yin H, Xing K, Zhang Y, Dissanayake DMAS, Lu Z, Zhao H, Zeng Z, Yun JH, Qi DC, Yin Z. Periodic nanostructures: preparation, properties and applications. Chem Soc Rev 2021; 50:6423-6482. [PMID: 34100047 DOI: 10.1039/d0cs01146k] [Citation(s) in RCA: 18] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
Periodic nanostructures, a group of nanomaterials consisting of single or multiple nano units/components periodically arranged into ordered patterns (e.g., vertical and lateral superlattices), have attracted tremendous attention in recent years due to their extraordinary physical and chemical properties that offer a huge potential for a multitude of applications in energy conversion, electronic and optoelectronic applications. Recent advances in the preparation strategies of periodic nanostructures, including self-assembly, epitaxy, and exfoliation, have paved the way to rationally modulate their ferroelectricity, superconductivity, band gap and many other physical and chemical properties. For example, the recent discovery of superconductivity observed in "magic-angle" graphene superlattices has sparked intensive studies in new ways, creating superlattices in twisted 2D materials. Recent development in the various state-of-the-art preparations of periodic nanostructures has created many new ideas and findings, warranting a timely review. In this review, we discuss the current advances of periodic nanostructures, including their preparation strategies, property modulations and various applications.
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Affiliation(s)
- Hang Yin
- Research School of Chemistry, Australian National University, ACT 2601, Australia.
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Hu Y, Yang T, Li D, Ding G, Dun C, Wu D, Wang X. Origins of Minimized Lattice Thermal Conductivity and Enhanced Thermoelectric Performance in WS 2/WSe 2 Lateral Superlattice. ACS OMEGA 2021; 6:7879-7886. [PMID: 33778299 PMCID: PMC7992166 DOI: 10.1021/acsomega.1c00457] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/25/2021] [Accepted: 03/05/2021] [Indexed: 06/12/2023]
Abstract
We report a configuration strategy for improving the thermoelectric (TE) performance of two-dimensional transition metal dichalcogenide WS2 based on the experimentally prepared WS2/WSe2 lateral superlattice (LS) crystal. On the basis of density function theory combined with a Boltzmann transport equation, we show that the TE figure of merit zT of monolayer WS2 is remarkably enhanced when forming into a WS2/WSe2 LS crystal. This is primarily ascribed to the almost halved lattice thermal conductivity due to the enhanced anharmonic processes. Electronic transport properties parallel (xx) and perpendicular (yy) to the superlattice period are highly symmetric for both p- and n-doped LS owing to the nearly isotropic lifetime of charger carriers. The spin-orbital effect causes a significant split of conduction band and leads to three-fold degenerate sub-bands and high density of states (DOS), which offers opportunity to obtain a high n-type Seebeck coefficient (S). Interestingly, the separated degenerate sub-bands and upper conduction band in monolayer WS2 form a remarkable stair-like DOS, yielding a higher S. The hole carriers with much higher mobility than electrons reveal the high p-type power factor, and the potential to be good p-type TE materials with optimal zT exceeds 1 at 400 K in WS2/WSe2 LS.
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Affiliation(s)
- Yonglan Hu
- School
of Science, Chongqing University of Posts
and Telecommunications, Chongqing 400065, China
| | - Tie Yang
- School
of Physical Science and Technology, Southwest
University, Chongqing 400715, China
| | - Dengfeng Li
- School
of Science, Chongqing University of Posts
and Telecommunications, Chongqing 400065, China
| | - Guangqian Ding
- School
of Science, Chongqing University of Posts
and Telecommunications, Chongqing 400065, China
| | - Chaochao Dun
- Department
of Aerospace and Mechanical Engineering, University of Notre Dame, Notre
Dame, Indiana 46556, United States
| | - Dandan Wu
- Institutes
of Physical Science and Information Technology, Anhui University, Hefei, Anhui 230601, China
| | - Xiaotian Wang
- School
of Physical Science and Technology, Southwest
University, Chongqing 400715, China
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