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Dong X, Hou Y, Deng C, Wu J, Fu H. Bi 3O 2.5Se 2: a two-dimensional high-mobility polar semiconductor with large interlayer and interfacial charge transfer. NANOSCALE 2024; 16:14766-14774. [PMID: 38973699 DOI: 10.1039/d4nr01758g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/09/2024]
Abstract
Two-dimensional semiconductors with large intrinsic polarity are highly attractive for applications in high-speed electronics, ultrafast and highly sensitive photodetectors and photocatalysis. However, previous studies mainly focus on neutral layered polar 2D materials with limited vertical dipoles and electrostatic potential difference (typically <1.5 eV). Here, using the first-principles calculations, we systematically investigated the polarity of few-layer Bi3O2.5Se2 semiconductors with ultrahigh predicted room-temperature carrier mobility (1790 cm2 V-1 s-1 for the monolayer). Thanks to its unique non-neutral layered structure, few-layer Bi3O2.5Se2 contributes to a substantial interlayer charge transfer (>0.5 e-) and almost the highest electrostatic potential difference (ΔΦ) of ∼4 eV among the experimentally attainable 2D layered materials. More importantly, positioning graphene on different charged layers ([Bi2O2.5]+ or [BiSe2]-) switches the charge transfer direction, inducing selective n-doping or p-doping. Furthermore, we can use polar Bi3O2.5Se2 as an exemplary assisted gate to gain additional holes or electrons except for the external electric field, thus breaking the traditional limitations of gate tunability (∼1014 cm-2) observed in experimental settings. Our work not only expands the family of polar 2D semiconductors, but also makes a conceptual advance on using them as an assisted gate in transistors.
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Affiliation(s)
- Xinyue Dong
- Tianjin Key Lab for Rare Earth Materials and Applications, Center for Rare Earth and Inorganic Functional Materials, Smart Sensor Interdisciplinary Science Center, School of Materials Science and Engineering, Nankai University, Tianjin 300350, P. R. China.
| | - Yameng Hou
- Tianjin Key Lab for Rare Earth Materials and Applications, Center for Rare Earth and Inorganic Functional Materials, Smart Sensor Interdisciplinary Science Center, School of Materials Science and Engineering, Nankai University, Tianjin 300350, P. R. China.
| | - Chaoyue Deng
- Center of Quantum Materials and Devices, College of Physics, Chongqing University, Chongqing 401331, P. R. China.
| | - Jinxiong Wu
- Tianjin Key Lab for Rare Earth Materials and Applications, Center for Rare Earth and Inorganic Functional Materials, Smart Sensor Interdisciplinary Science Center, School of Materials Science and Engineering, Nankai University, Tianjin 300350, P. R. China.
| | - Huixia Fu
- Center of Quantum Materials and Devices, College of Physics, Chongqing University, Chongqing 401331, P. R. China.
- Chongqing Key Laboratory for Strongly Coupled Physics, Chongqing University, Chongqing 401331, P. R. China
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2
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Gao Z, He Y, Xiong K. Two-dimensional Janus monolayers SPtAZ 2 (A = Si and Ge; Z = N, P, and As): insight into their photocatalytic properties via first-principles calculations. Phys Chem Chem Phys 2024; 26:21173-21185. [PMID: 39072651 DOI: 10.1039/d4cp01838a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/30/2024]
Abstract
As a derivative of the two-dimensional material family, two-dimensional Janus materials have garnered widespread attention in recent years. Consequently, in this work, we systematically investigated the stability, electronic properties, photocatalytic properties, optical properties, and carrier mobility of SPtAZ2 (A = Si and Ge; Z = N, P, and As) monolayers using first-principles calculations. In the equilibrium state, we identified four stable structures that exhibited the properties of indirect band gap semiconductors using the HSE06 hybrid functional. Through the exploration of the photocatalytic and optical properties of these four stable structures, we observed that SPtSiN2, SPtSiP2, and SPtGeAs2 monolayers possess favorable band edge positions, high solar-to-hydrogen efficiency (up to 30.74%), and light absorption efficiency, thus endowing these three structures with commendable photocatalytic and light absorption performance. We additionally calculated the carrier mobility of these three structures and identified significant differences in electron and hole mobilities in the same direction, facilitating the effective separation of electrons and holes. Finally, we explored the effects of biaxial strain on the electronic properties, photocatalysis, and light absorption of stable SPtAZ2 monolayers. Our research results not only expand the 2D Janus material family, but also successfully predict a type of photocatalyst capable of utilizing visible light for overall water splitting.
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Affiliation(s)
- Zhen Gao
- Department of Physics, Yunnan University, Kunming 650091, People's Republic of China.
| | - Yao He
- Department of Physics, Yunnan University, Kunming 650091, People's Republic of China.
| | - Kai Xiong
- Materials Genome Institute, School of Materials and Energy, Yunnan University, Kunming 650091, P. R. China.
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3
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Zhu Y, Jiang S, Zhang J, Qu Z, Wu Z, Xu Z, Hu W, Dai Y, Yang F. Janus monolayer PXC (X = As/Sb) for photocatalytic water splitting with a negative Poisson's ratio. Phys Chem Chem Phys 2024; 26:4564-4571. [PMID: 38247318 DOI: 10.1039/d3cp04930b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/23/2024]
Abstract
Two-dimensional (2D) Janus materials have attracted considerable attention in photocatalysis owing to their robust redox capability and efficient segregation. In this study, we propose a novel Janus monolayer structure, denoted as PXC (X = As/Sb), exhibiting favorable stability in terms of dynamics, thermal properties, and mechanical characteristics. The PXC monolayers demonstrate a relatively smaller Young's modulus (132.5/119.5 N m-1 for PAsC/PSbC) and large negative Poisson's ratios (-0.15/-0.101 for PAsC/PSbC). Moreover, the HSE06 + SOC functional results show that PAsC/PSbC are indirect semiconductors with a 2.33/1.43 eV band gap, exhibiting a suitable band alignment for photocatalytic water splitting. The calculated high carrier mobility (104 cm2 V-1 s-1), along with a significant discrepancy, determined by the deformation potential theory and the built-up field induced by the large intrinsic dipole, effectively suppresses the recombination of photogenerated carriers. Furthermore, PXC monolayers possess a strong absorption capacity in the visible and ultraviolet light region (105 cm-1). Therefore, our results indicate that PXC monolayers hold great potential for application in the field of photocatalytic water splitting.
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Affiliation(s)
- Yunlai Zhu
- School of Integrated Circuits, Anhui University, Hefei, Anhui, 230601, China.
| | - Shuo Jiang
- School of Integrated Circuits, Anhui University, Hefei, Anhui, 230601, China.
| | - Jishun Zhang
- School of Integrated Circuits, Anhui University, Hefei, Anhui, 230601, China.
| | - Zihan Qu
- School of Integrated Circuits, Anhui University, Hefei, Anhui, 230601, China.
| | - Zuheng Wu
- School of Integrated Circuits, Anhui University, Hefei, Anhui, 230601, China.
| | - Zuyu Xu
- School of Integrated Circuits, Anhui University, Hefei, Anhui, 230601, China.
| | - Wei Hu
- School of Integrated Circuits, Anhui University, Hefei, Anhui, 230601, China.
| | - Yuehua Dai
- School of Integrated Circuits, Anhui University, Hefei, Anhui, 230601, China.
| | - Fei Yang
- School of Integrated Circuits, Anhui University, Hefei, Anhui, 230601, China.
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4
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Gu D, Qin W, Hu S, Li R, Chen X, Tao X, Ouyang Y, Zhu W. Enhanced Photocatalytic Activity of Two-Dimensional Polar Monolayer SiTe for Water-Splitting via Strain Engineering. Molecules 2023; 28:molecules28072971. [PMID: 37049734 PMCID: PMC10096314 DOI: 10.3390/molecules28072971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/22/2023] [Revised: 03/19/2023] [Accepted: 03/23/2023] [Indexed: 03/29/2023] Open
Abstract
A two-dimensional (2D) polar monolayer with a polarization electric field can be used as a potential photocatalyst. In this work, first principle calculations were used to investigate the stability and photocatalytic properties of 2D polar monolayer SiTe as a potential promising catalyst in water-splitting. Our results show that the 2D polar monolayer SiTe possesses an indirect band gap of 2.41 eV, a polarization electric field from the (001) surface to the (001¯) surface, a wide absorption region, and a suitable band alignment for photocatalytic water-splitting. We also discovered that the photocatalytic activity of 2D polar monolayer SiTe could be effectively tuned through strain engineering. Additionally, strain engineering, particularly compressive strain in the range from −1% to −3%, can enhance the photocatalytic activity of 2D polar monolayer SiTe. Overall, our findings suggest that 2D polar monolayer SiTe has the potential to be a promising catalyst for photocatalytic water-splitting using visible light.
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Affiliation(s)
- Di Gu
- Department of Physics, School of Science, Guangdong University of Petrochemical Technology, Maoming 525000, China; (D.G.)
| | - Wen Qin
- Department of Physics, School of Science, Guangdong University of Petrochemical Technology, Maoming 525000, China; (D.G.)
| | - Sumei Hu
- Department of Physics, School of Science, Guangdong University of Petrochemical Technology, Maoming 525000, China; (D.G.)
| | - Rong Li
- Department of Physics, School of Science, Guangdong University of Petrochemical Technology, Maoming 525000, China; (D.G.)
| | - Xingyuan Chen
- Department of Physics, School of Science, Guangdong University of Petrochemical Technology, Maoming 525000, China; (D.G.)
- Correspondence: (X.C.); (W.Z.)
| | - Xiaoma Tao
- School of Physical Science and Technology, Guangxi University, Nanning 530004, China
| | - Yifang Ouyang
- School of Physical Science and Technology, Guangxi University, Nanning 530004, China
| | - Weiling Zhu
- Department of Physics, School of Science, Guangdong University of Petrochemical Technology, Maoming 525000, China; (D.G.)
- Correspondence: (X.C.); (W.Z.)
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Said I, Gueddida S, Barhoumi M, Pascale F, Said M, Lebègue S. First-principles study of the structural and electronic properties of tetragonal ZrOX (X = S, Se, and Te) monolayers and their vdW heterostructures for applications in optoelectronics and photocatalysis. J Chem Phys 2023; 158:094708. [PMID: 36889946 DOI: 10.1063/5.0137710] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/12/2023] Open
Abstract
Using first-principles calculations, we have studied the structural and electronic properties of ZrOX (X = S, Se, and Te) monolayers and their van der Waals heterostructures in the tetragonal structure. Our results show that these monolayers are dynamically stable and are semiconductors with electronic bandgaps ranging from 1.98 to 3.16 eV as obtained with the GW approximation. By computing their band edges, we show that ZrOS and ZrOSe are of interest for water splitting applications. In addition, the van der Waals heterostructures formed by these monolayers show a type I band alignment for ZrOTe/ZrOSe and a type II alignment for the other two heterostructures, making them potential candidates for certain optoelectronic applications involving electron/hole separation.
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Affiliation(s)
- Imen Said
- Laboratoire de la Matière Condensée et des Nanosciences (LMCN), LR11ES40, Faculté des Sciences de Monastir, Université de Monastir, Monastir 5000, Tunisia
| | - Saber Gueddida
- Laboratoire Pysique et Chimie Théoriques (LPCT, UMR CNRS UL 7019), Université de Lorraine, BP 239, Boulevard des Aiguillettes, 54506 Vandoeuvre-lès-Nancy, Cedex, France
| | - Mohamed Barhoumi
- Laboratoire de la Matière Condensée et des Nanosciences (LMCN), LR11ES40, Faculté des Sciences de Monastir, Université de Monastir, Monastir 5000, Tunisia
| | - Fabien Pascale
- Laboratoire Pysique et Chimie Théoriques (LPCT, UMR CNRS UL 7019), Université de Lorraine, BP 239, Boulevard des Aiguillettes, 54506 Vandoeuvre-lès-Nancy, Cedex, France
| | - Moncef Said
- Laboratoire de la Matière Condensée et des Nanosciences (LMCN), LR11ES40, Faculté des Sciences de Monastir, Université de Monastir, Monastir 5000, Tunisia
| | - Sébastien Lebègue
- Laboratoire Pysique et Chimie Théoriques (LPCT, UMR CNRS UL 7019), Université de Lorraine, BP 239, Boulevard des Aiguillettes, 54506 Vandoeuvre-lès-Nancy, Cedex, France
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6
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Yan XJ, Li WY, Nan GT, Zou X, Liu LL, Wang A, Wang SF, Wei Y, Yang CM, Hu L. Comparative study of Janus B 2XY (X, Y = S, Se, Te) and F-BNBN-H monolayers for water splitting: revealing the positive and negative roles of the intrinsic dipole. Phys Chem Chem Phys 2022; 24:20980-20987. [PMID: 36000294 DOI: 10.1039/d2cp03069a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
It is widely recognized that the intrinsic dipole in two-dimensional (2D) photocatalysts promotes hydrogen production during water splitting. Herein, we wonder whether the intrinsic dipole plays a negative role in water splitting. In this work, we make a comparative study of the structural, electronic, and photocatalytic properties of Janus B2XY (X, Y = S, Se, Te) and F-BNBN-H monolayers using first principles. Our theoretical results reveal that both B2XY and F-BNBN-H monolayers exhibit spatially separated conduction band minimum (CBM) and valence band maximum (VBM), as well as vacuum level differences at the opposite surfaces due to the intrinsic dipole. The F-BNBN-H monolayer has excellent redox ability for water splitting, because its CBM is located at the surface with a lower vacuum level and its VBM is distributed on the opposite surface possessing a higher vacuum level. By sharp contrast, B2XY monolayers have limited or vanishing redox ability, because their CBM is located at the surface with a higher vacuum level and their VBM is distributed on the opposite surface with a lower vacuum level. This work emphasizes the negative role of vacuum level differences of photocatalysts caused by the intrinsic dipole in water splitting.
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Affiliation(s)
- Xiao-Jun Yan
- College of Electronic and Information Engineer, Chongqing Three Gorges University, Chongqing, 404100, China. .,College of Computer science and Engineering, Chongqing Three Gorges University, Chongqing, 404100, China
| | - Wen-Yuan Li
- College of Electronic and Information Engineer, Chongqing Three Gorges University, Chongqing, 404100, China. .,College of Computer science and Engineering, Chongqing Three Gorges University, Chongqing, 404100, China
| | - Guo-Ting Nan
- College of Electronic and Information Engineer, Chongqing Three Gorges University, Chongqing, 404100, China. .,College of Computer science and Engineering, Chongqing Three Gorges University, Chongqing, 404100, China
| | - Xing Zou
- College of Electronic and Information Engineer, Chongqing Three Gorges University, Chongqing, 404100, China.
| | - Li-Li Liu
- College of Teacher Education, Chongqing Three Gorges University, Chongqing, 404100, China
| | - Anrong Wang
- College of Electronic and Information Engineer, Chongqing Three Gorges University, Chongqing, 404100, China.
| | - Shi-Fa Wang
- College of Electronic and Information Engineer, Chongqing Three Gorges University, Chongqing, 404100, China.
| | - Yong Wei
- College of Electronic and Information Engineer, Chongqing Three Gorges University, Chongqing, 404100, China.
| | - Chun-Ming Yang
- College of Chemistry and Chemistry Engineering, Yan'an University, Shaanxi Key Laboratory of Chemical Reaction Engineering, Yan'an 716000, China
| | - Lei Hu
- College of Electronic and Information Engineer, Chongqing Three Gorges University, Chongqing, 404100, China.
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7
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Bafekry A, Fadlallah MM, Faraji M, Hieu NN, Jappor HR, Stampfl C, Ang YS, Ghergherehchi M. Puckered Penta-like PdPX (X = O, S, Te) Semiconducting Nanosheets: First-Principles Study of the Mechanical, Electro-Optical, and Photocatalytic Properties. ACS APPLIED MATERIALS & INTERFACES 2022; 14:21577-21584. [PMID: 35471020 DOI: 10.1021/acsami.1c23988] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
The atomic, electronic, optical, and mechanical properties of penta-like two-dimensional PdPX (X = O, S, Te) nanosheets have been systematically investigated using density functional theory calculations. All three PdPX nanosheets exhibit dynamic and mechanical stability on the basis of an analysis of phonon dispersions and the Born criteria, respectively. The PdPX monolayers are found to be brittle structures. Our calculations demonstrate that the PdPX nanosheets exhibit semiconducting characteristics with indirect band gaps of 0.93 (1.99), 1.34 (2.11), and 0.74 (1.51) eV for X = O, S, Te, respectively, using the PBE (HSE06) functional, where PdPTe is the best material for visible-light photocatalytic water splitting. Our findings give important basic characteristics of penta-like two-dimensional PdPX materials and should motivate further theoretical and experimental investigations of these interesting materials.
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Affiliation(s)
| | - Mohamed M Fadlallah
- Department of Physics, Faculty of Science, Benha University, 13518 Benha, Egypt
| | - Mehrdad Faraji
- Micro and Nanotechnology Graduate Program, TOBB University of Economics and Technology, Sogutozu Caddesi No 43 Sogutozu 06560, Ankara, Turkey
| | - Nguyen N Hieu
- Institute of Research and Development, Duy Tan University, Da Nang 550000, Viet Nam
| | - Hamad R Jappor
- Department of Physics, College of Education for Pure Sciences, University of Babylon, Hilla 00000, Iraq
| | - Catherine Stampfl
- School of Physics, The University of Sydney, Camperdown, New South Wales 2006, Australia
| | - Yee Sin Ang
- Science, Mathematics and Technology (SMT) Cluster, Singapore University of Technology and Design, Singapore 487372
| | - Mitra Ghergherehchi
- Department of Electrical and Computer Engineering, Sungkyunkwan University, 16419 Suwon, South Korea
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8
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Xu FY, Zhou Y, Zhang T, Zeng ZY, Chen XR, Geng HY. An ab initio study of two-dimensional anisotropic monolayers ScXY (X = S and Se; Y = Cl and Br) for photocatalytic water splitting applications with high carrier mobilities. Phys Chem Chem Phys 2022; 24:3770-3779. [PMID: 35081609 DOI: 10.1039/d1cp05369h] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/24/2023]
Abstract
Recently, metal oxyhalides have been broadly studied due to their hierarchical structures and promising functionalities. Herein, a thorough study of newly modeled monolayers ScXY (X = S and Se; Y = Cl and Br), a class of derivates of ScOBr monolayers, was conducted using first-principles calculations. We theoretically confirm that these ScXY monolayers are mechanically, dynamically, and thermally stable. Young's modulus and Poisson's ratio calculated for all these ScXY monolayers obviously exhibit anisotropic properties. All these monolayers are indirect-gap semiconductors with bandgaps in the range of 2.35-3.18 eV, and their conduction band minimum (CBM) and valence band maximum (VBM) can straddle the reduction and oxidation potential of water very well, respectively. Particularly, ScSeCl and ScSeBr monolayers have the most propitious bandgaps and band alignments to be used as promising photocatalysts, and the predicted carrier mobility is much larger than that of many other two-dimensional materials. Moreover, the predicted anisotropic carrier mobilities and indirect bandgaps will diminish the recombination and facilitate the migration of photo-generated electron and hole pairs. Moreover, biaxial strain (-5% to 5%) effects on the band alignments and bandgaps are discussed. Our findings highlight that ScSeCl and ScSeBr monolayers are envisioned to act as promising photocatalytic and photoelectronic materials with anisotropic ultrahigh carrier mobilities.
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Affiliation(s)
- Fei-Yang Xu
- Institute of Atomic and Molecular Physics, College of Physics, Sichuan University, Chengdu 610065, China.
| | - Yu Zhou
- Department of Physics, College of Basic Medical Sciences, Army Medical University, Chongqing 400038, China
| | - Tian Zhang
- College of Physics and Electronic Engineering, Sichuan Normal University, Chengdu 610101, China
| | - Zhao-Yi Zeng
- College of Physics and Electronic Engineering, Chongqing Normal University, Chongqing 400047, China.
| | - Xiang-Rong Chen
- Institute of Atomic and Molecular Physics, College of Physics, Sichuan University, Chengdu 610065, China.
| | - Hua-Yun Geng
- National Key Laboratory for Shock Wave and Detonation Physics Research, Institute of Fluid Physics, CAEP, Mianyang 621900, China
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Zhang L, Gu Y, Du A. Two-Dimensional Janus Antimony Selenium Telluride with Large Rashba Spin Splitting and High Electron Mobility. ACS OMEGA 2021; 6:31919-31925. [PMID: 34870014 PMCID: PMC8638011 DOI: 10.1021/acsomega.1c04680] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/27/2021] [Accepted: 11/05/2021] [Indexed: 06/13/2023]
Abstract
Janus two-dimensional materials with large Rashba spin splitting and high electron mobility are rarely reported but highly desired for nanoscale spintronics. Herein, using density functional theory calculations, we predicated Janus Sb2Se x Te3-x (x = 1 or 2) monolayers simultaneously harboring these fascinating properties. The predicated monolayers are indirect semiconductors with great dynamical, thermal, and mechanical stability. The spin-orbital coupling (SOC) and the out-of-plane asymmetry lead to Rashba spin splitting at the conduction band minimum (CBM), which can be effectively tuned by the small uniaxial strain. The strong band dispersion at the CBM leads to small electron effective mass, consequently enabling a high electron mobility that reaches up to 6816.63 cm2 V-1 s-1. Moreover, Janus Sb2Se x Te3-x monolayers possess great light absorption capability within the visible and infrared regions of solar light. Our findings highlight promising candidates for high-speed spintronic devices and may motivate more research efforts on carrier transport and SOC effects in Janus group V and VI monolayers.
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Affiliation(s)
- Lei Zhang
- School
of Chemistry and Physics, Queensland University
of Technology, Gardens Point
Campus, Brisbane, QLD 4000, Australia
- Centre
for Materials Science, Queensland University
of Technology, Gardens Point
Campus, Brisbane, QLD 4000, Australia
| | - Yuantong Gu
- School
of Mechanical, Medical and Process Engineering, Queensland University of Technology, Gardens Point Campus, Brisbane, QLD 4000, Australia
| | - Aijun Du
- School
of Chemistry and Physics, Queensland University
of Technology, Gardens Point
Campus, Brisbane, QLD 4000, Australia
- Centre
for Materials Science, Queensland University
of Technology, Gardens Point
Campus, Brisbane, QLD 4000, Australia
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