1
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Xia R, Peng Y, Fang L, Meng X. Electrical field and biaxial strain tunable electronic properties of the PtSe 2/Hf 2CO 2 heterostructure. RSC Adv 2023; 13:26812-26821. [PMID: 37701500 PMCID: PMC10495041 DOI: 10.1039/d3ra04363k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2023] [Accepted: 08/09/2023] [Indexed: 09/14/2023] Open
Abstract
The structure and electronic properties of two-dimensional vertical van der Waals PtSe2/Hf2CO2 heterostructure have been investigated based on first-principles calculations. The results show that the PtSe2 and Hf2CO2 monolayers form a type-I heterostructure with both the conduction band minimum (CBM) and valence band maximum (VBM) located at the Hf2CO2 layer. The electronic properties of PtSe2/Hf2CO2 heterostructure can be effectively adjusted by applying external electric field or biaxial strain. The transition in band alignment from type-I to type-II can be manipulated by controlling the strength and direction of the electric field. Additionally, the transition from type-I to type-II have also taken place under the strains, and the band gap of the PtSe2/Hf2CO2 heterostructure decreases with increasing the compressive or tensible strain. Under a strong strain of -8%, the PtSe2/Hf2CO2 heterostructure can transform from semiconductor to metal. These findings provide a promising method to tune the electronic properties of PtSe2/Hf2CO2 heterostructure and design a new vdW heterostructure in the applications for electronic and optoelectronic devices.
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Affiliation(s)
- Ruizhe Xia
- School of Science, Hubei University of Technology Wuhan 430068 P. R. China
| | - Yi Peng
- School of Science, Hubei University of Technology Wuhan 430068 P. R. China
| | - Li Fang
- School of Science, Hubei University of Technology Wuhan 430068 P. R. China
| | - Xuan Meng
- School of Science, Hubei University of Technology Wuhan 430068 P. R. China
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2
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Guan Y, Yao H, Zhan H, Wang H, Zhou Y, Kang J. Optoelectronic properties and strain regulation of the 2D WS 2/ZnO van der Waals heterostructure. RSC Adv 2021; 11:14085-14092. [PMID: 35423906 PMCID: PMC8697725 DOI: 10.1039/d1ra01877a] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/10/2021] [Accepted: 04/06/2021] [Indexed: 12/20/2022] Open
Abstract
The combination of zinc oxide (ZnO) and transition metal dichalcogenide (TMD) nanoparticles has higher photocatalytic efficiency and field emission performance than TMDs or ZnO, as well as significantly higher water cracking photocatalytic activity. By first-principles calculation, we investigated the structural and optoelectronic properties of the two-dimensional (2D) WS2/ZnO van der Waals (vdWs) heterostructure, and the regulation effect of biaxial strain. It is revealed that the conduction-band minimum (CBM) is lower than the reduction potential of water (EH+/H2 ≈ −4.44 eV), and the valence-band maximum (VBM) is lower than the oxidation potential (EO2/H2O ≈ −5.67 eV), thus the heterostructure is a good oxidant in the water decomposition process, but cannot match the requirements for water reduction. By applying a −2% biaxial strain, the CBM is elevated to a position higher than the reduction potential of water, then the 2D vdWs WS2/ZnO heterostructure becomes a good material for the application of water reduction and other photovoltaic and photocatalytic devices. 2D WS2/ZnO vdWs heterostructure becomes a good material for water-splitting applications after a strain is applied.![]()
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Affiliation(s)
- Yujun Guan
- Fujian Provincial Key Laboratory of Semiconductor Materials and Applications, CI Center for OSED, College of Physics Science and Technology, Xiamen University Xiamen 361005 P.R. China
| | - Hui Yao
- Fujian Provincial Key Laboratory of Semiconductor Materials and Applications, CI Center for OSED, College of Physics Science and Technology, Xiamen University Xiamen 361005 P.R. China
| | - Huahan Zhan
- Fujian Provincial Key Laboratory of Semiconductor Materials and Applications, CI Center for OSED, College of Physics Science and Technology, Xiamen University Xiamen 361005 P.R. China
| | - Hao Wang
- Fujian Provincial Key Laboratory of Semiconductor Materials and Applications, CI Center for OSED, College of Physics Science and Technology, Xiamen University Xiamen 361005 P.R. China .,Research Institute for Biomimetics and Soft Matter, Xiamen University Xiamen 361005 P.R. China
| | - Yinghui Zhou
- Fujian Provincial Key Laboratory of Semiconductor Materials and Applications, CI Center for OSED, College of Physics Science and Technology, Xiamen University Xiamen 361005 P.R. China
| | - Junyong Kang
- Fujian Provincial Key Laboratory of Semiconductor Materials and Applications, CI Center for OSED, College of Physics Science and Technology, Xiamen University Xiamen 361005 P.R. China
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3
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Jaiswal HN, Liu M, Shahi S, Wei S, Lee J, Chakravarty A, Guo Y, Wang R, Lee JM, Chang C, Fu Y, Dixit R, Liu X, Yang C, Yao F, Li H. Diode-Like Selective Enhancement of Carrier Transport through Metal-Semiconductor Interface Decorated by Monolayer Boron Nitride. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2020; 32:e2002716. [PMID: 32725788 DOI: 10.1002/adma.202002716] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/21/2020] [Revised: 06/21/2020] [Indexed: 06/11/2023]
Abstract
2D semiconductors such as monolayer molybdenum disulfide (MoS2 ) are promising material candidates for next-generation nanoelectronics. However, there are fundamental challenges related to their metal-semiconductor (MS) contacts, which limit the performance potential for practical device applications. In this work, 2D monolayer hexagonal boron nitride (h-BN) is exploited as an ultrathin decorating layer to form a metal-insulator-semiconductor (MIS) contact, and an innovative device architecture is designed as a platform to reveal a novel diode-like selective enhancement of the carrier transport through the MIS contact. The contact resistance is significantly reduced when the electrons are transported from the semiconductor to the metal, but is barely affected when the electrons are transported oppositely. A concept of carrier collection barrier is proposed to interpret this intriguing phenomenon as well as a negative Schottky barrier height obtained from temperature-dependent measurements, and the critical role of the collection barrier at the drain end is shown for the overall transistor performance.
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Affiliation(s)
- Hemendra Nath Jaiswal
- Department of Electrical Engineering, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA
| | - Maomao Liu
- Department of Electrical Engineering, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA
| | - Simran Shahi
- Department of Electrical Engineering, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA
| | - Sichen Wei
- Department of Materials Design and Innovation, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA
| | - Jihea Lee
- Department of Materials Design and Innovation, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA
| | - Anindita Chakravarty
- Department of Electrical Engineering, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA
| | - Yutong Guo
- Department of Electrical Engineering, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA
| | - Ruiqiang Wang
- Department of Electrical Engineering, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA
| | - Jung Mu Lee
- Department of Electrical Engineering, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA
| | - Chaoran Chang
- Department of Materials Design and Innovation, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA
| | - Yu Fu
- Department of Materials Design and Innovation, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA
| | - Ripudaman Dixit
- Department of Electrical Engineering, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA
| | - Xiaochi Liu
- School of Physics and Electronics, Central South University, Cha1ngsha, 410083, China
| | - Cheng Yang
- School of Physics and Electronics, Shandong Normal University, Jinan, 250014, China
| | - Fei Yao
- Department of Materials Design and Innovation, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA
| | - Huamin Li
- Department of Electrical Engineering, University at Buffalo, The State University of New York, Buffalo, NY, 14260, USA
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4
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Ye W, Hu J, Hu X, Zhang W, Ma X, Wang H. Rational Construction of Z‐Scheme CuInS
2
/Au/g‐C
3
N
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Heterostructure: Experimental Results and Theoretical Calculation. ChemCatChem 2019. [DOI: 10.1002/cctc.201901227] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
Affiliation(s)
- Wenhua Ye
- Hubei Provincial Key Laboratory of Green Materials for Light Industry Department of Material Forming and Control Engineering School of Materials and Chemical EngineeringHubei University of Technology Wuhan 430068 P.R. China
| | - Jisong Hu
- Department of Optical Engineering School of ScienceHubei University of Technology Wuhan 430068 P.R. China
| | - Xiaofeng Hu
- Hubei Provincial Key Laboratory of Green Materials for Light Industry Department of Material Forming and Control Engineering School of Materials and Chemical EngineeringHubei University of Technology Wuhan 430068 P.R. China
| | - Wenhua Zhang
- Hubei Provincial Key Laboratory of Green Materials for Light Industry Department of Material Forming and Control Engineering School of Materials and Chemical EngineeringHubei University of Technology Wuhan 430068 P.R. China
| | - Xinguo Ma
- Department of Optical Engineering School of ScienceHubei University of Technology Wuhan 430068 P.R. China
| | - Huihu Wang
- Hubei Provincial Key Laboratory of Green Materials for Light Industry Department of Material Forming and Control Engineering School of Materials and Chemical EngineeringHubei University of Technology Wuhan 430068 P.R. China
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5
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Progress in Contact, Doping and Mobility Engineering of MoS2: An Atomically Thin 2D Semiconductor. CRYSTALS 2018. [DOI: 10.3390/cryst8080316] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2023]
Abstract
Atomically thin molybdenum disulfide (MoS2), a member of the transition metal dichalcogenide (TMDC) family, has emerged as the prototypical two-dimensional (2D) semiconductor with a multitude of interesting properties and promising device applications spanning all realms of electronics and optoelectronics. While possessing inherent advantages over conventional bulk semiconducting materials (such as Si, Ge and III-Vs) in terms of enabling ultra-short channel and, thus, energy efficient field-effect transistors (FETs), the mechanically flexible and transparent nature of MoS2 makes it even more attractive for use in ubiquitous flexible and transparent electronic systems. However, before the fascinating properties of MoS2 can be effectively harnessed and put to good use in practical and commercial applications, several important technological roadblocks pertaining to its contact, doping and mobility (µ) engineering must be overcome. This paper reviews the important technologically relevant properties of semiconducting 2D TMDCs followed by a discussion of the performance projections of, and the major engineering challenges that confront, 2D MoS2-based devices. Finally, this review provides a comprehensive overview of the various engineering solutions employed, thus far, to address the all-important issues of contact resistance (RC), controllable and area-selective doping, and charge carrier mobility enhancement in these devices. Several key experimental and theoretical results are cited to supplement the discussions and provide further insight.
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6
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Maji TK, Kar P, Mandal H, Bhattacharya C, Karmakar D, Pal SK. Halide‐Modulated Functionality of Wide Band Gap Zinc Oxide Semiconductor Nanoparticle. ChemistrySelect 2018. [DOI: 10.1002/slct.201801272] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/15/2022]
Affiliation(s)
- Tuhin Kumar Maji
- Department of ChemicalBiological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences Block JD, Sector III, Salt Lake Kolkata 700 106 India
| | - Prasenjit Kar
- Department of ChemicalBiological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences Block JD, Sector III, Salt Lake Kolkata 700 106 India
| | - Harahari Mandal
- Department of ChemistryIndian Institute of Engineering Science & Technology, (IIEST) Shibpur Howrah - 711 103 India
| | - Chinmoy Bhattacharya
- Department of ChemistryIndian Institute of Engineering Science & Technology, (IIEST) Shibpur Howrah - 711 103 India
| | - Debjani Karmakar
- Technical Physics DepartmentBhabha Atomic Research Centre Mumbai 400085 India
| | - Samir Kumar Pal
- Department of ChemicalBiological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences Block JD, Sector III, Salt Lake Kolkata 700 106 India
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7
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Savazzi F, Risplendi F, Mallia G, Harrison NM, Cicero G. Unravelling Some of the Structure-Property Relationships in Graphene Oxide at Low Degree of Oxidation. J Phys Chem Lett 2018; 9:1746-1749. [PMID: 29557654 DOI: 10.1021/acs.jpclett.8b00421] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Graphene oxide (GO) is a versatile 2D material whose properties can be tuned by changing the type and concentration of oxygen-containing functional groups attached to its surface. However, a detailed knowledge of the dependence of the chemo/physical features of this material on its chemical composition is largely unknown. We combine classical molecular dynamics and density functional theory simulations to predict the structural and electronic properties of GO at low degree of oxidation and suggest a revision of the Lerf-Klinowski model. We find that layer deformation is larger for samples containing high concentrations of epoxy groups and that correspondingly the band gap increases. Targeted chemical modification of the GO surface appears to be an effective route to tailor the electronic properties of the monolayer for given applications. Our simulations also show that the chemical shift of the C-1s XPS peak allows one to unambiguously characterize GO composition, resolving the peak attribution uncertainty often encountered in experiments.
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Affiliation(s)
- Filippo Savazzi
- Dipartimento di Scienza Applicata e Tecnologia , Politecnico di Torino , Corso Duca degli Abruzzi 24 , Torino 10129 , Italy
| | - Francesca Risplendi
- Dipartimento di Scienza Applicata e Tecnologia , Politecnico di Torino , Corso Duca degli Abruzzi 24 , Torino 10129 , Italy
| | - Giuseppe Mallia
- Department of Chemistry , Imperial College London , South Kensington , London SW7 2AZ , United Kingdom
| | - Nicholas M Harrison
- Department of Chemistry , Imperial College London , South Kensington , London SW7 2AZ , United Kingdom
| | - Giancarlo Cicero
- Dipartimento di Scienza Applicata e Tecnologia , Politecnico di Torino , Corso Duca degli Abruzzi 24 , Torino 10129 , Italy
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8
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Tang S, Wu W, Zhang S, Ye D, Zhong P, Li X, Liu L, Li YF. Tuning the activity of the inert MoS 2 surface via graphene oxide support doping towards chemical functionalization and hydrogen evolution: a density functional study. Phys Chem Chem Phys 2018; 20:1861-1871. [PMID: 29292808 DOI: 10.1039/c7cp06636h] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The basal plane of MoS2 provides a promising platform for chemical functionalization and the hydrogen evolution reaction (HER); however, its practical utilization remains challenging due to the lack of active sites and its low conductivity. Herein, using first principles simulations, we first proposed a novel and effective strategy for significantly enhancing the activity of the inert MoS2 surface using a graphene oxide (GO) support (MoS2/GOs). The chemical bonding of the functional groups (CH3 and NH2) on the MoS2-GO hybrid is stronger than that in freestanding MoS2 or MoS2-graphene. Upon increasing the oxygen group concentration or introducing N heteroatoms into the GO support, the stability of the chemically functionalized MoS2 is improved. Furthermore, use of GOs to support pristine and defective MoS2 with a S vacancy (S-MoS2) can greatly promote the HER activity of the basal plane. The catalytic activity of S-MoS2 is further enhanced by doping N into GOs; this results in a hydrogen adsorption free energy of almost zero (ΔGH = ∼-0.014 eV). The coupling interaction with the GO substrate reduces the p-type Schottky barrier heights (SBH) of S-MoS2 and modifies its electronic properties, which facilitate charge transfer between them. Our calculated results are consistent with the experimental observations. Thus, the present results open new avenues for the chemical functionalization of MoS2-based nanosheets and HER catalysts.
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Affiliation(s)
- Shaobin Tang
- Key Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province, Gannan Normal University, Ganzhou 341000, China.
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9
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Lin Y, Dai Y, Sun Y, Ding C, Sun W, Zhu X, Liu H, Luo C. A turn-on chemiluminescence biosensor for selective and sensitive detection of adenosine based on HKUST-1 and QDs-luminol-aptamer conjugates. Talanta 2018; 182:116-124. [PMID: 29501130 DOI: 10.1016/j.talanta.2018.01.065] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2017] [Revised: 01/24/2018] [Accepted: 01/29/2018] [Indexed: 10/18/2022]
Abstract
In this work, HKUST-1 and QDs-luminol-aptamer conjugates were prepared. The QDs-luminol-aptamer conjugates can be adsorbed by graphene oxide through π-π conjugation. When the adenosine was added, the QDs-luminol-aptamer conjugates were released from magnetic graphene oxide (MGO), the chemiluminescent switch was turned on. It was reported that HKUST-1 can catalyze the chemiluminescence reaction of luminol-H2O2 system in an alkaline medium, and improve the chemiluminescence resonance energy transfer (CRET) between chemiluminescence and QDs indirectly. Thus, the adenosine can be detected sensitively. Based on this phenomenon, the excellent platform for detection of adenosine was established. Under the optimized conditions, the linear detection range for adenosine was 1.0 × 10-12-2.2 × 10-10 mol/L with a detection limit of 2.1 × 10-13 mol/L. The proposed method was successfully used for adenosine detection in biological samples.
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Affiliation(s)
- Yanna Lin
- Key Laboratory of Interfacial Reaction & Sensing Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China
| | - Yuxue Dai
- Key Laboratory of Interfacial Reaction & Sensing Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China
| | - Yuanling Sun
- Key Laboratory of Interfacial Reaction & Sensing Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China
| | - Chaofan Ding
- Key Laboratory of Interfacial Reaction & Sensing Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China
| | - Weiyan Sun
- Key Laboratory of Interfacial Reaction & Sensing Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China
| | - Xiaodong Zhu
- Key Laboratory of Interfacial Reaction & Sensing Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China
| | - Hao Liu
- Key Laboratory of Interfacial Reaction & Sensing Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China
| | - Chuannan Luo
- Key Laboratory of Interfacial Reaction & Sensing Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan 250022, PR China.
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10
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Zhao P, Jin H, Lv X, Huang B, Ma Y, Dai Y. Modified MXene: promising electrode materials for constructing Ohmic contacts with MoS2for electronic device applications. Phys Chem Chem Phys 2018; 20:16551-16557. [DOI: 10.1039/c8cp02300j] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Promising electrode materials for constructing Ohmic contact with MoS2for electronic device application.
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Affiliation(s)
- Pei Zhao
- School of Physics
- State Key Laboratory of Crystal Materials
- Shandong University
- 250100 Jinan
- People's Republic of China
| | - Hao Jin
- College of Physics and Energy
- Shenzhen University
- 518060 Shenzhen
- People's Republic of China
| | - Xingshuai Lv
- School of Physics
- State Key Laboratory of Crystal Materials
- Shandong University
- 250100 Jinan
- People's Republic of China
| | - Baibiao Huang
- School of Physics
- State Key Laboratory of Crystal Materials
- Shandong University
- 250100 Jinan
- People's Republic of China
| | - Yandong Ma
- School of Physics
- State Key Laboratory of Crystal Materials
- Shandong University
- 250100 Jinan
- People's Republic of China
| | - Ying Dai
- School of Physics
- State Key Laboratory of Crystal Materials
- Shandong University
- 250100 Jinan
- People's Republic of China
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11
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Hua X, Ma X, Hu J, He H, Xu G, Huang C, Chen X. Controlling electronic properties of MoS2/graphene oxide heterojunctions for enhancing photocatalytic performance: the role of oxygen. Phys Chem Chem Phys 2018; 20:1974-1983. [DOI: 10.1039/c7cp07303h] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The manipulation of the constituents of novel hetero-photocatalysts is an effective method for improving photocatalytic efficiency, but a theoretical understanding of the relationship between interlayer interaction and photocatalytic activity is still lacking.
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Affiliation(s)
- Xiaotian Hua
- School of Science
- Hubei University of Technology
- Wuhan 430068
- China
| | - Xinguo Ma
- School of Science
- Hubei University of Technology
- Wuhan 430068
- China
- Hubei Collaborative Innovation Center for High-efficiency Utilization of Solar Energy
| | - Jisong Hu
- School of Science
- Hubei University of Technology
- Wuhan 430068
- China
| | - Hua He
- School of Science
- Hubei University of Technology
- Wuhan 430068
- China
| | - Guowang Xu
- School of Science
- Hubei University of Technology
- Wuhan 430068
- China
| | - Chuyun Huang
- Hubei Collaborative Innovation Center for High-efficiency Utilization of Solar Energy
- Hubei University of Technology
- Wuhan 430068
- China
| | - Xiaobo Chen
- Department of Chemistry
- University of Missouri-Kansas City
- Kansas City
- USA
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12
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Couto WRM, Miwa RH, Fazzio A. Tuning the p-type Schottky barrier in 2D metal/semiconductor interface:boron-sheet on MoSe 2, and WSe 2. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2017; 29:405002. [PMID: 28857050 DOI: 10.1088/1361-648x/aa7f0c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Van der Waals (vdW) metal/semiconductor heterostructures have been investigated through first-principles calculations. We have considered the recently synthesized borophene (Mannix et al 2015 Science 350 1513), and the planar boron sheets (S1 and S2) (Feng et al 2016 Nat. Chem. 8 563) as the 2D metal layer, and the transition metal dichalcogenides (TMDCs) MoSe2, and WSe2 as the semiconductor monolayer. We find that the energetic stability of those 2D metal/semiconductor heterojunctions is mostly ruled by the vdW interactions; however, chemical interactions also take place in borophene/TMDC. The electronic charge transfer at the metal/semiconductor interface has been mapped, where we find a a net charge transfer from the TMDCs to the boron sheets. Further electronic structure calculations reveal that the metal/semiconductor interfaces, composed by planar boron sheets S1 and S2, present a p-type Schottky barrier which can be tuned to a p-type ohmic contact by an external electric field.
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Affiliation(s)
- W R M Couto
- Instituto de Física, Universidade Federal de Uberlândia, CP 593, 38400-902, Uberlândia, MG, Brazil. Instituto Federal do Triângulo Mineiro, 38600-000, Paracatu, MG, Brazil
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13
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Su J, Feng L, Zeng W, Liu Z. Controlling the electronic and geometric structures of 2D insertions to realize high performance metal/insertion-MoS 2 sandwich interfaces. NANOSCALE 2017; 9:7429-7441. [PMID: 28530290 DOI: 10.1039/c7nr00720e] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Metal/insertion-MoS2 sandwich interfaces are designed to reduce the Schottky barriers at metal-MoS2 interfaces. The effects of geometric and electronic structures of two-dimensional (2D) insertion materials on the contact properties of metal/insertion-MoS2 interfaces are comparatively studied by first-principles calculations. Regardless of the geometric and electronic structures of 2D insertion materials, Fermi level pinning effects and charge scattering at the metal/insertion-MoS2 interface are weakened due to weak interactions between the insertion and MoS2 layers, no gap states and negligible structural deformations for MoS2 layers. The Schottky barriers at metal/insertion-MoS2 interfaces are induced by three interface dipoles and four potential steps that are determined by the charge transfers and structural deformations of 2D insertion materials. The lower the electron affinities of 2D insertion materials, the more are the electrons lost from the Sc surface, resulting in lower n-type Schottky barriers at Sc/insertion-MoS2 interfaces. The larger the ionization potentials and the thinner the thicknesses of 2D insertion materials, the fewer are the electrons that accumulate at the Pt surface, leading to lower p-type Schottky barriers at Pt/insertion-MoS2 interfaces. All Sc/insertion-MoS2 interfaces exhibited ohmic characters. The Pt/BN-MoS2 interface exhibits the lowest p-type Schottky barrier of 0.52 eV due to the largest ionization potential (∼6.88 eV) and the thinnest thickness (single atomic layer thickness) of BN. These results in this work are beneficial to understand and design high performance metal/insertion-MoS2 interfaces through 2D insertion materials.
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Affiliation(s)
- Jie Su
- State Key Lab of Solidification Processing, College of Materials Science and Engineering, Northwestern Polytechnical University, Xi'an, Shaanxi 710072, P. R. China.
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14
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Su J, Feng L, Liu S, Liu Z. Non-invasively improving the Schottky barriers of metal–MoS2interfaces: effects of atomic vacancies in a BN buffer layer. Phys Chem Chem Phys 2017; 19:20582-20592. [DOI: 10.1039/c7cp03669h] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Using first-principles calculations within density functional theory, vacancies in the BN buffer layer have been predicted to improve the Schottky barrier of the metal–MoS2interface without deteriorating the intrinsic properties of the MoS2layer.
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Affiliation(s)
- Jie Su
- State Key Lab of Solidification Processing
- College of Materials Science and Engineering
- Northwestern Polytechnical University
- Xi’an
- P. R. China
| | - Liping Feng
- State Key Lab of Solidification Processing
- College of Materials Science and Engineering
- Northwestern Polytechnical University
- Xi’an
- P. R. China
| | - Siyang Liu
- State Key Lab of Solidification Processing
- College of Materials Science and Engineering
- Northwestern Polytechnical University
- Xi’an
- P. R. China
| | - Zhengtang Liu
- State Key Lab of Solidification Processing
- College of Materials Science and Engineering
- Northwestern Polytechnical University
- Xi’an
- P. R. China
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15
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Tang S, Wu W, Xie X, Li X, Gu J. Band gap opening of bilayer graphene by graphene oxide support doping. RSC Adv 2017. [DOI: 10.1039/c7ra01134b] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
In contrast to the metallic monolayer graphene by graphene oxides (GOs) doping, the sizable band gap of bilayer graphene is opened by GOs.
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Affiliation(s)
- Shaobin Tang
- Key Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province
- Gannan Normal University
- Ganzhou 341000
- China
| | - Weihua Wu
- Key Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province
- Gannan Normal University
- Ganzhou 341000
- China
| | - Xiaojun Xie
- School of Physics and Electric Information
- Gannan Normal University
- Ganzhou 341000
- China
| | - Xiaokang Li
- Key Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province
- Gannan Normal University
- Ganzhou 341000
- China
| | - Junjing Gu
- State Key Laboratory of Physical Chemistry of Solid Surfaces
- Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry
- College of Chemistry and Chemical Engineering
- Xiamen University
- Xiamen 361005
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16
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Oh HM, Jeong H, Han GH, Kim H, Kim JH, Lee SY, Jeong SY, Jeong S, Park DJ, Kim KK, Lee YH, Jeong MS. Modulating Electronic Properties of Monolayer MoS 2 via Electron-Withdrawing Functional Groups of Graphene Oxide. ACS NANO 2016; 10:10446-10453. [PMID: 27783894 DOI: 10.1021/acsnano.6b06319] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Modulation of the carrier concentration and electronic type of monolayer (1L) MoS2 is highly important for applications in logic circuits, solar cells, and light-emitting diodes. Here, we demonstrate the tuning of the electronic properties of large-area 1L-MoS2 using graphene oxide (GO). GO sheets are well-known as hole injection layers since they contain electron-withdrawing groups such as carboxyl, hydroxyl, and epoxy. The optical and electronic properties of GO-treated 1L-MoS2 are dramatically changed. The photoluminescence intensity of GO-treated 1L-MoS2 is increases by more than 470% compared to the pristine sample because of the increase in neutral exciton contribution. In addition, the A1g peak in Raman spectra shifts considerably, revealing that GO treatment led to the formation of p-type doped 1L-MoS2. Moreover, the current vs voltage (I-V) curves of GO-coated 1L-MoS2 field effect transistors show that the electron concentration of 1L-MoS2 is significantly lower in comparison with pristine 1L-MoS2. Current rectification is also observed from the I-V curve of the lateral diode structure with 1L-MoS2 and 1L-MoS2/GO, indicating that the electronic structure of MoS2 is significantly modulated by the electron-withdrawing functional group of GO.
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Affiliation(s)
- Hye Min Oh
- Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS) , Suwon 16419, Republic of Korea
| | - Hyun Jeong
- Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS) , Suwon 16419, Republic of Korea
| | - Gang Hee Han
- Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS) , Suwon 16419, Republic of Korea
| | - Hyun Kim
- Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS) , Suwon 16419, Republic of Korea
| | - Jung Ho Kim
- Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS) , Suwon 16419, Republic of Korea
| | - Si Young Lee
- Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS) , Suwon 16419, Republic of Korea
| | - Seung Yol Jeong
- Nano Hybrid Technology Research Center, Korea Electrotechnology Research Institute (KERI) , Changwon 51543, Republic of Korea
- Department of Electrical Functionality Material Engineering, University of Science and Technology (UST) , Daejeon 34113, Republic of Korea
| | - Sooyeon Jeong
- Nano Hybrid Technology Research Center, Korea Electrotechnology Research Institute (KERI) , Changwon 51543, Republic of Korea
| | - Doo Jae Park
- Department of Physics, Hallym University , Hallymdaehaggil 1, Chuncheon 24252, Republic of Korea
| | - Ki Kang Kim
- Department of Energy and Materials Engineering, Dongguk University-Seoul , Seoul 04620, Republic of Korea
| | - Young Hee Lee
- Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS) , Suwon 16419, Republic of Korea
| | - Mun Seok Jeong
- Center for Integrated Nanostructure Physics, Institute for Basic Science (IBS) , Suwon 16419, Republic of Korea
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17
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Synthetic methods and potential applications of transition metal dichalcogenide/graphene nanocomposites. Coord Chem Rev 2016. [DOI: 10.1016/j.ccr.2016.08.004] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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18
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Jia S, Sun HD, Du JH, Zhang ZK, Zhang DD, Ma LP, Chen JS, Ma DG, Cheng HM, Ren WC. Graphene oxide/graphene vertical heterostructure electrodes for highly efficient and flexible organic light emitting diodes. NANOSCALE 2016; 8:10714-10723. [PMID: 27153523 DOI: 10.1039/c6nr01649a] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
The relatively high sheet resistance, low work function and poor compatibility with hole injection layers (HILs) seriously limit the applications of graphene as transparent conductive electrodes (TCEs) for organic light emitting diodes (OLEDs). Here, a graphene oxide/graphene (GO/G) vertical heterostructure is developed as TCEs for high-performance OLEDs, by directly oxidizing the top layer of three-layer graphene films with ozone treatment. Such GO/G heterostructure electrodes show greatly improved optical transmittance, a large work function, high stability, and good compatibility with HIL materials (MoO3 in this work). Moreover, the conductivity of the heterostructure is not sacrificed compared to the pristine three-layer graphene electrodes, but is significantly higher than that of pristine two-layer graphene films. In addition to high flexibility, OLEDs with different emission colors based on the GO/G heterostructure TCEs show much better performance than those based on indium tin oxide (ITO) anodes. Green OLEDs with GO/G heterostructure electrodes have the maximum current efficiency and power efficiency, as high as 82.0 cd A(-1) and 98.2 lm W(-1), respectively, which are 36.7% (14.8%) and 59.2% (15.0%) higher than those with pristine graphene (ITO) anodes. These findings open up the possibility of using graphene for next generation high-performance flexible and wearable optoelectronics with high stability.
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Affiliation(s)
- S Jia
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, P. R. China.
| | - H D Sun
- State Key Laboratory of Polymers Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, P. R. China.
| | - J H Du
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, P. R. China.
| | - Z K Zhang
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, P. R. China.
| | - D D Zhang
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, P. R. China.
| | - L P Ma
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, P. R. China.
| | - J S Chen
- State Key Laboratory of Polymers Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, P. R. China.
| | - D G Ma
- State Key Laboratory of Polymers Physics and Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, 5625 Renmin Street, Changchun 130022, P. R. China.
| | - H M Cheng
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, P. R. China.
| | - W C Ren
- Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, 72 Wenhua Road, Shenyang 110016, P. R. China.
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19
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Yang Z, Liang H, Wang X, Ma X, Zhang T, Yang Y, Xie L, Chen D, Long Y, Chen J, Chang Y, Yan C, Zhang X, Zhang X, Ge B, Ren Z, Xue M, Chen G. Atom-Thin SnS2-xSex with Adjustable Compositions by Direct Liquid Exfoliation from Single Crystals. ACS NANO 2016; 10:755-762. [PMID: 26690902 DOI: 10.1021/acsnano.5b05823] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Two-dimensional (2D) chalcogenide materials are fundamentally and technologically fascinating for their suitable band gap energy and carrier type relevant to their adjustable composition, structure, and dimensionality. Here, we demonstrate the exfoliation of single-crystal SnS2-xSex (SSS) with S/Se vacancies into an atom-thin layer by simple sonication in ethanol without additive. The introduction of vacancies at the S/Se site, the conflicting atomic radius of sulfur in selenium layers, and easy incorporation with an ethanol molecule lead to high ion accessibility; therefore, atom-thin SSS flakes can be effectively prepared by exfoliating the single crystal via sonication. The in situ pyrolysis of such materials can further adjust their compositions, representing tunable activation energy, band gap, and also tunable response to analytes of such materials. As the most basic and crucial step of the 2D material field, the successful synthesis of an uncontaminated and atom-thin sample will further push ahead the large-scale applications of 2D materials, including, but not limited to, electronics, sensing, catalysis, and energy storage fields.
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Affiliation(s)
- Zhanhai Yang
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences , Beijing 100190, China
| | - Hui Liang
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences , Beijing 100190, China
| | - Xusheng Wang
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University , Beijing 100871, China
| | - Xinlei Ma
- Research Center for Bioengineering and Sensing Technology, University of Science & Technology Beijing , Beijing 100083, China
| | - Tao Zhang
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University , Beijing 100871, China
| | - Yanlian Yang
- National Center for Nanoscience and Technology , Beijing 100190, China
| | - Liming Xie
- National Center for Nanoscience and Technology , Beijing 100190, China
| | - Dong Chen
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences , Beijing 100190, China
| | - Yujia Long
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences , Beijing 100190, China
| | - Jitao Chen
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University , Beijing 100871, China
| | - Yunjie Chang
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences , Beijing 100190, China
| | - Chunhua Yan
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University , Beijing 100871, China
| | - Xinxiang Zhang
- Beijing National Laboratory for Molecular Sciences, College of Chemistry and Molecular Engineering, Peking University , Beijing 100871, China
| | - Xueji Zhang
- Research Center for Bioengineering and Sensing Technology, University of Science & Technology Beijing , Beijing 100083, China
| | - Binghui Ge
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences , Beijing 100190, China
| | - Zhian Ren
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences , Beijing 100190, China
| | - Mianqi Xue
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences , Beijing 100190, China
| | - Genfu Chen
- Institute of Physics and Beijing National Laboratory for Condensed Matter Physics, Chinese Academy of Sciences , Beijing 100190, China
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20
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Wang Y, Yang RX, Quhe R, Zhong H, Cong L, Ye M, Ni Z, Song Z, Yang J, Shi J, Li J, Lu J. Does p-type ohmic contact exist in WSe2-metal interfaces? NANOSCALE 2016; 8:1179-1191. [PMID: 26666570 DOI: 10.1039/c5nr06204g] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
Formation of low-resistance metal contacts is the biggest challenge that masks the intrinsic exceptional electronic properties of two dimensional WSe2 devices. We present the first comparative study of the interfacial properties between monolayer/bilayer (ML/BL) WSe2 and Sc, Al, Ag, Au, Pd, and Pt contacts by using ab initio energy band calculations with inclusion of the spin-orbital coupling (SOC) effects and quantum transport simulations. The interlayer coupling tends to reduce both the electron and hole Schottky barrier heights (SBHs) and alters the polarity for the WSe2-Au contact, while the SOC chiefly reduces the hole SBH. In the absence of the SOC, the Pd contact has the smallest hole SBH. Dramatically, the Pt contact surpasses the Pd contact and becomes the p-type ohmic or quasi-ohmic contact with inclusion of the SOC. Therefore, p-type ohmic or quasi-ohmic contact exists in WSe2-metal interfaces. Our study provides a theoretical foundation for the selection of favorable metal electrodes in ML/BL WSe2 devices.
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Affiliation(s)
- Yangyang Wang
- State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, P. R. China. and Department of Nuclear Science and Engineering and Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - Ruo Xi Yang
- State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, P. R. China. and Department of Chemistry, University of Bath, Claverton Down, Bath BA2 7AY, UK
| | - Ruge Quhe
- State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, P. R. China. and State Key Laboratory of Information Photonics and Optical Communications & School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China
| | - Hongxia Zhong
- State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, P. R. China. and Department of Physics, Washington University in St. Louis, St. Louis, Missouri 63130, USA
| | - Linxiao Cong
- State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, P. R. China.
| | - Meng Ye
- State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, P. R. China.
| | - Zeyuan Ni
- State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, P. R. China.
| | - Zhigang Song
- State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, P. R. China.
| | - Jinbo Yang
- State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, P. R. China. and Collaborative Innovation Center of Quantum Matter, Beijing 100871, P. R. China
| | - Junjie Shi
- State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, P. R. China.
| | - Ju Li
- Department of Nuclear Science and Engineering and Department of Materials Science and Engineering, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA
| | - Jing Lu
- State Key Laboratory for Mesoscopic Physics and Department of Physics, Peking University, Beijing 100871, P. R. China. and Collaborative Innovation Center of Quantum Matter, Beijing 100871, P. R. China
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21
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Pérez del Pino A, György E, Cotet C, Baia L, Logofatu C. Laser-induced chemical transformation of free-standing graphene oxide membranes in liquid and gas ammonia environments. RSC Adv 2016. [DOI: 10.1039/c6ra07109k] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A fast and versatile method is developed for laser-induced reduction and nitrogen doping of free-standing graphene oxide membranes.
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Affiliation(s)
- A. Pérez del Pino
- Instituto de Ciencia de Materiales de Barcelona
- Consejo Superior de Investigaciones Científicas (ICMAB-CSIC)
- 08193 Bellaterra
- Spain
| | - E. György
- Instituto de Ciencia de Materiales de Barcelona
- Consejo Superior de Investigaciones Científicas (ICMAB-CSIC)
- 08193 Bellaterra
- Spain
- National Institute for Lasers
| | - C. Cotet
- Babes-Bolyai University
- Faculty of Chemistry and Chemical Engineering
- Department of Chemical Engineering
- Cluj-Napoca
- Romania
| | - L. Baia
- Babes-Bolyai University
- Faculty of Physics & Interdisciplinary Research Institute on Bio-Nano-Sciences
- Cluj-Napoca
- Romania
| | - C. Logofatu
- National Institute for Materials Physics
- 77125 Bucharest
- Romania
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22
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Zirak M, Ebrahimi M, Zhao M, Moradlou O, Samadi M, Bayat A, Zhang HL, Moshfegh AZ. Fabrication and surface stochastic analysis of enhanced photoelectrochemical activity of a tuneable MoS2–CdS thin film heterojunction. RSC Adv 2016. [DOI: 10.1039/c5ra26487a] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023] Open
Abstract
CdS/MoS2(t)/ITO thin films were prepared via a facile method with controllable surface properties, and a model was proposed to describe the enhancement of photoelectrochemical activity from a stochastic view point.
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Affiliation(s)
- M. Zirak
- Department of Physics
- Sharif University of Technology
- Tehran
- Iran
| | - M. Ebrahimi
- Department of Physics
- Sharif University of Technology
- Tehran
- Iran
| | - M. Zhao
- State Key Laboratory of Applied Organic Chemistry
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
- P. R. China
| | - O. Moradlou
- Department of Chemistry
- Alzahra University
- Tehran
- Iran
| | - M. Samadi
- Department of Physics
- Sharif University of Technology
- Tehran
- Iran
| | - A. Bayat
- Department of Physics
- Sharif University of Technology
- Tehran
- Iran
| | - H.-L. Zhang
- State Key Laboratory of Applied Organic Chemistry
- College of Chemistry and Chemical Engineering
- Lanzhou University
- Lanzhou 730000
- P. R. China
| | - A. Z. Moshfegh
- Department of Physics
- Sharif University of Technology
- Tehran
- Iran
- Institute of Nanoscience and Nanotechnology
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23
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Zhang L, Wan L, Yu Y, Wang B, Xu F, Wei Y, Zhao Y. Modulation of Electronic Structure of Armchair MoS 2 Nanoribbon. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2015; 119:22164-22171. [PMID: 26331336 DOI: 10.1021/acs.jpcc.5b04747] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We perform first-principles calculations on electronic structures of armchair MoS2 nanoribbons (AMoS2NRs) passivated by non-metal atoms. In contrast to bare AMoS2NR (AMoS2NR-bare) or purely hydrogen (H) edge-terminated AMoS2NR (AMoS2NR-H), it is found that H and oxygen (O) hybrid edge-terminated AMoS2NR (AMoS2NR-H-O) is more stable. AMoS2NR-H-O exhibits a direct band gap of about 1.43 eV, which is larger than those of pristine AMoS2NR (about 0.61 eV) and AMoS2NR-H (about 0.60 eV), and even exceeds the band gap of bulk MoS2 (about 0.86 eV) and is close to that of monolayer MoS2 (about 1.67 eV). The remarkable band gap of AMoS2NR-H-O is attributed to the charge redistribution on the edge atoms of MoS2 nanoribbon, especially the charges on the edge Mo atoms. Detailed calculations of AMoS2NR-H-O reveal that over 70% of the total density of states (DOS) of the conduction band minimum and the valence band maximum are contributed by the Mo atoms. In particular, edge Mo atoms play a crucial role in modulating the electronic structure. In addition, we have studied a series of functionalized AMoS2NR-H-X with X = S, F, C, N, and P, respectively. It is found that AMoS2NR-H-X with X = S, 2F, C possess remarkable electronic band gaps, while AMoS2NR-H-X with X = F, N, P are metallic. Our studies suggest that non-metal atom hybrid passivation can efficiently tune the electronic band gap of MoS2 nanoribbon and open a new route to obtain MoS2 based practical nanoelectronic device and photo¬voltaic device.
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24
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Zhang L, Wan L, Yu Y, Wang B, Xu F, Wei Y, Zhao Y. Modulation of Electronic Structure of Armchair MoS 2Nanoribbon. J Phys Chem A 2015. [DOI: 10.1021/acs.jpca.5b04747] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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25
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Wang F, Wang Z, Wang Q, Wang F, Yin L, Xu K, Huang Y, He J. Synthesis, properties and applications of 2D non-graphene materials. NANOTECHNOLOGY 2015; 26:292001. [PMID: 26134271 DOI: 10.1088/0957-4484/26/29/292001] [Citation(s) in RCA: 32] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
As an emerging class of new materials, two-dimensional (2D) non-graphene materials, including layered and non-layered, and their heterostructures are currently attracting increasing interest due to their promising applications in electronics, optoelectronics and clean energy. In contrast to traditional semiconductors, such as Si, Ge and III-V group materials, 2D materials show significant merits of ultrathin thickness, very high surface-to-volume ratio, and high compatibility with flexible devices. Owing to these unique properties, while scaling down to ultrathin thickness, devices based on these materials as well as artificially synthetic heterostructures exhibit novel and surprising functions and performances. In this review, we aim to provide a summary on the state-of-the-art research activities on 2D non-graphene materials. The scope of the review will cover the preparation of layered and non-layered 2D materials, construction of 2D vertical van der Waals and lateral ultrathin heterostructures, and especially focus on the applications in electronics, optoelectronics and clean energy. Moreover, the review is concluded with some perspectives on the future developments in this field.
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Affiliation(s)
- Feng Wang
- Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology, Beijing 100190, People's Republic of China. University of Chinese Academy of Sciences, No. 19A Yuquan Road, Beijing 100049, People's Republic of China
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26
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Sun Q, Dai Y, Ma Y, Wei W, Huang B. Vertical and Bidirectional Heterostructures from Graphyne and MSe2 (M = Mo, W). J Phys Chem Lett 2015; 6:2694-2701. [PMID: 26266850 DOI: 10.1021/acs.jpclett.5b01169] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Vertical and lateral heterostructures with atomically clean and sharp interfaces have opened up new realms in materials science, device physics and engineering. Herein, inspired by recent experiments, the unprecedented bidirectional heterostructures (BDHs) of γ-graphyne@MoSe2/WSe2 as well as γ-graphyne@MoSe2 and γ-graphyne@WSe2 are proposed and examined on the basis of first-principles calculations. Our results reveal that a novel wrinkled γ-graphyne with narrowed energy gap and strong binding strength is achieved on the planar and smooth substrate in γ-graphyne@MoSe2/WSe2. The direct-indirect band gap crossover is also found in terms of interlayer coupling. Furthermore, we demonstrate that electron-hole pairs can be spatially separated, and the carrier mobility would be benefited from the absorbed γ-graphyne in the BDHs. These results provide not only new insights into the physical and chemical properties of the vertical and bidirectional heterostructures, but also a new strategy for fabricating unprecedented 2D nanomaterials with exciting properties.
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Affiliation(s)
- Qilong Sun
- †School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, People's Republic of China
| | - Ying Dai
- †School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, People's Republic of China
| | - Yandong Ma
- ‡Engineering and Science, Jacobs University Bremen, Campus Ring 1, 28759 Bremen, Germany
| | - Wei Wei
- †School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, People's Republic of China
| | - Baibiao Huang
- †School of Physics, State Key Laboratory of Crystal Materials, Shandong University, Jinan 250100, People's Republic of China
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27
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Çakır D, Peeters FM. Fluorographane: a promising material for bipolar doping of MoS2. Phys Chem Chem Phys 2015; 17:27636-41. [DOI: 10.1039/c5cp04438c] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Using first principles calculations we show that one can realize vanishing n-type/p-type Schottky barrier heights when contacting MoS2 to fluorographane.
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Affiliation(s)
- Deniz Çakır
- Department of Physics
- University of Antwerp
- 2610 Antwerpen
- Belgium
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28
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Wu W, Tang S, Gu J, Cao X. Realizing semiconductor to metal transition in graphitic ZnO and MoS2 nanocomposite with external electric field. RSC Adv 2015. [DOI: 10.1039/c5ra18114c] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
The graphitic ZnO and MoS2 heterostructures realize the semiconducting to metallic behavior transitions under external electric field.
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Affiliation(s)
- Weihua Wu
- Key Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province
- Gannan Normal University
- Ganzhou 341000
- China
| | - Shaobin Tang
- Key Laboratory of Organo-Pharmaceutical Chemistry of Jiangxi Province
- Gannan Normal University
- Ganzhou 341000
- China
| | - Junjing Gu
- State Key Laboratory of Physical Chemistry of Solid Surfaces and Fujian Provincial Key Laboratory of Theoretical and Computational Chemistry
- College of Chemistry and Chemical Engineering
- Xiamen University
- Xiamen 361005
- China
| | - Xinrui Cao
- Department of Theoretical Chemistry and Biology
- School of Biotechnology
- Royal Institute of Technology
- S-106 91 Stockholm
- Sweden
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