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Sala A, Caporali M, Serrano-Ruiz M, Armillotta F, Vesselli E, Genuzio F, Menteş TO, Locatelli A, Comelli G, Africh C, Verdini A. Black or red phosphorus yields the same blue phosphorus film. NANOSCALE 2022; 14:16256-16261. [PMID: 36285832 DOI: 10.1039/d2nr02657k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
After the discovery of graphene, many other 2D materials have been predicted theoretically and successfully prepared. In this context, single-sheet black phosphorus - phosphorene - is emerging as a viable contender in the field of (2D) semiconductors. Phosphorene offers high carrier mobility and an anisotropic structure that gives rise to a modulation of physical and chemical properties. This opens the way to many novel and fascinating applications related to field-effect transistors and optoelectronic devices. In previous studies, a single layer of blue phosphorene intermixed with Au atoms was grown using purified black phosphorus as a precursor. Starting from the observation that phosphorus vapor mainly consists of P clusters, in this work we aimed at obtaining blue phosphorus using much less expensive purified red phosphorus as an evaporant. By means of microscopy, spectroscopy and diffraction experiments, we show that black or red phosphorus deposition on Au(111) substrates yields the same blue phosphorus film.
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Affiliation(s)
- Alessandro Sala
- CNR-IOM Materials Foundry, S. S. 14 km 163.5, Trieste, I-34149, Italy.
- Physics Department, University of Trieste, via Valerio 2, Trieste, I-34127, Italy
| | - Maria Caporali
- CNR-ICCOM Institute of Chemistry of Organometallic Compounds, Via Madonna del Piano 10, Sesto Fiorentino, I-50019, Italy
| | - Manuel Serrano-Ruiz
- CNR-ICCOM Institute of Chemistry of Organometallic Compounds, Via Madonna del Piano 10, Sesto Fiorentino, I-50019, Italy
| | - Francesco Armillotta
- Physics Department, University of Trieste, via Valerio 2, Trieste, I-34127, Italy
| | - Erik Vesselli
- CNR-IOM Materials Foundry, S. S. 14 km 163.5, Trieste, I-34149, Italy.
- Physics Department, University of Trieste, via Valerio 2, Trieste, I-34127, Italy
| | - Francesca Genuzio
- Elettra-Sincrotrone Trieste S.C.p.A, S.S. 14 km 163.5 in AREA Science Park, Trieste, I-34149, Italy
| | - Tevfik Onur Menteş
- Elettra-Sincrotrone Trieste S.C.p.A, S.S. 14 km 163.5 in AREA Science Park, Trieste, I-34149, Italy
| | - Andrea Locatelli
- Elettra-Sincrotrone Trieste S.C.p.A, S.S. 14 km 163.5 in AREA Science Park, Trieste, I-34149, Italy
| | - Giovanni Comelli
- CNR-IOM Materials Foundry, S. S. 14 km 163.5, Trieste, I-34149, Italy.
- Physics Department, University of Trieste, via Valerio 2, Trieste, I-34127, Italy
| | - Cristina Africh
- CNR-IOM Materials Foundry, S. S. 14 km 163.5, Trieste, I-34149, Italy.
| | - Alberto Verdini
- CNR-IOM Materials Foundry, c/o Physics and Geology Department, University of Perugia, via A. Pascoli 2, Perugia, I-06123, Italy.
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2
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Dang MT, Duy NVA, Zaccone A, Schall P, Dinh VA. Structural modification enhances the optoelectronic properties of defect blue phosphorene thin films. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 34:285702. [PMID: 35443237 DOI: 10.1088/1361-648x/ac68be] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2022] [Accepted: 04/20/2022] [Indexed: 06/14/2023]
Abstract
Active enhancement of the optical absorption coefficient to improve the light converting efficiency of thin-film solar cell materials is crucial to develop the next-generation solar cell devices. Here we report first-principles calculations with generalized gradient approximation to study the optoelectronic properties of pristine and divacancy (DV) blue phosphorene (BlueP) thin films under structural deformation. We show that instead of formingsp-like covalent bonds as in the pristine BlueP layer, a DV introduces two particular dangling bonds between the voids. Using a microscopic (non-) affine deformation model, we reveal that the orbital hybridization of these dangling bonds is strongly modified in both the velocity and vorticity directions depending on the type of deformation, creating an effective light trap to enhance the material absorption efficiency. Furthermore, this successful light trap is complemented by a clear signature ofσ+πplasmon when a DV BlueP layer is slightly compressive. These results demonstrate a practical approach to tailor the optoelectronic properties of low-dimensional materials and to pave a novel strategy to design functionalized solar cell devices from the bottom-up with selective defects.
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Affiliation(s)
- M T Dang
- School of Education, Can Tho University, 3/2 Street, Ninh Kieu, Can Tho, Vietnam
| | - N V A Duy
- FPT University, Can Tho Campus, 600 Nguyen Van Cu Street, Ninh Kieu, Can Tho, Vietnam
| | - A Zaccone
- Department of Physics 'A Pontremoli', University of Milan, via Celoria 16, 20133 Milan, Italy
| | - P Schall
- Van der Waals-Zeeman Institute, University of Amsterdam, Science Park 904, Amsterdam, The Netherlands
| | - V A Dinh
- Department of Precision Engineering, Graduate School of Engineering, Osaka University, 2-1 Yamadaoka, Suita, Osaka 565-0871, Japan
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3
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Jakhar M, Kumar A, Ahluwalia PK, Tankeshwar K, Pandey R. Engineering 2D Materials for Photocatalytic Water-Splitting from a Theoretical Perspective. MATERIALS (BASEL, SWITZERLAND) 2022; 15:2221. [PMID: 35329672 PMCID: PMC8954018 DOI: 10.3390/ma15062221] [Citation(s) in RCA: 12] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/08/2022] [Revised: 03/06/2022] [Accepted: 03/14/2022] [Indexed: 12/19/2022]
Abstract
Splitting of water with the help of photocatalysts has gained a strong interest in the scientific community for producing clean energy, thus requiring novel semiconductor materials to achieve high-yield hydrogen production. The emergence of 2D nanoscale materials with remarkable electronic and optical properties has received much attention in this field. Owing to the recent developments in high-end computation and advanced electronic structure theories, first principles studies offer powerful tools to screen photocatalytic systems reliably and efficiently. This review is organized to highlight the essential properties of 2D photocatalysts and the recent advances in the theoretical engineering of 2D materials for the improvement in photocatalytic overall water-splitting. The advancement in the strategies including (i) single-atom catalysts, (ii) defect engineering, (iii) strain engineering, (iv) Janus structures, (v) type-II heterostructures (vi) Z-scheme heterostructures (vii) multilayer configurations (viii) edge-modification in nanoribbons and (ix) the effect of pH in overall water-splitting are summarized to improve the existing problems for a photocatalytic catalytic reaction such as overcoming large overpotential to trigger the water-splitting reactions without using cocatalysts. This review could serve as a bridge between theoretical and experimental research on next-generation 2D photocatalysts.
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Affiliation(s)
- Mukesh Jakhar
- Department of Physics, Central University of Punjab, Bathinda 151401, India;
| | - Ashok Kumar
- Department of Physics, Central University of Punjab, Bathinda 151401, India;
| | | | - Kumar Tankeshwar
- Department of Physics and Astrophysics, Central University of Haryana, Mahendragarh 123031, India;
| | - Ravindra Pandey
- Department of Physics, Michigan Technological University, Houghton, MI 49931, USA;
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4
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Raval D, Gupta SK, Gajjar PN, Ahuja R. Strain modulating electronic band gaps and SQ efficiencies of semiconductor 2D PdQ 2 (Q = S, Se) monolayer. Sci Rep 2022; 12:2964. [PMID: 35194055 PMCID: PMC8863876 DOI: 10.1038/s41598-022-06142-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2021] [Accepted: 01/18/2022] [Indexed: 11/16/2022] Open
Abstract
We studied the physical, electronic transport and optical properties of a unique pentagonal PdQ2 (Q = S, Se) monolayers. The dynamic stability of 2Dwrinkle like-PdQ2 is proven by positive phonon frequencies in the phonon dispersion curve. The optimized structural parameters of wrinkled pentagonal PdQ2 are in good agreement with the available experimental results. The ultimate tensile strength (UTHS) was calculated and found that, penta-PdS2 monolayer can withstand up to 16% (18%) strain along x (y) direction with 3.44 GPa (3.43 GPa). While, penta-PdSe2 monolayer can withstand up to 17% (19%) strain along x (y) dirrection with 3.46 GPa (3.40 GPa). It is found that, the penta-PdQ2 monolayers has the semiconducting behavior with indirect band gap of 0.94 and 1.26 eV for 2D-PdS2 and 2D-PdSe2, respectively. More interestingly, at room temperacture, the hole mobilty (electron mobility) obtained for 2D-PdS2 and PdSe2 are 67.43 (258.06) cm2 V-1 s-1 and 1518.81 (442.49) cm2 V-1 s-1, respectively. In addition, I-V characteristics of PdSe2 monolayer show strong negative differential conductance (NDC) region near the 3.57 V. The Shockly-Queisser (SQ) effeciency prameters of PdQ2 monolayers are also explored and the highest SQ efficeinciy obtained for PdS2 is 33.93% at -5% strain and for PdSe2 is 33.94% at -2% strain. The penta-PdQ2 exhibits high optical absorption intensity in the UV region, up to 4.04 × 105 (for PdS2) and 5.28 × 105 (for PdSe2), which is suitable for applications in optoelectronic devices. Thus, the ultrathin PdQ2 monolayers could be potential material for next-generation solar-cell applications and high performance nanodevices.
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Affiliation(s)
- Dhara Raval
- Department of Physics, University School of Sciences, Gujarat University, Ahmedabad, 380009, India
| | - Sanjeev K Gupta
- Computational Materials and Nanoscience Group, Department of Physics and Electronics, St. Xavier's College, Ahmedabad, 380009, India.
| | - P N Gajjar
- Department of Physics, University School of Sciences, Gujarat University, Ahmedabad, 380009, India.
| | - Rajeev Ahuja
- Condensed Matter Theory Group, Department of Physics and Astronomy, Uppsala University, Box 516, 751 20, Uppsala, Sweden
- Department of Physics, Indian Institute of Technology Ropar, Rupnagar, Punjab, 140001, India
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5
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Nanoribbons of 2D materials: A review on emerging trends, recent developments and future perspectives. Coord Chem Rev 2022. [DOI: 10.1016/j.ccr.2021.214335] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
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Zhang S, Li Y, Wang YP, Li J, Li M, Long M. The spin-polarized edge states of blue phosphorene nanoribbons induced by electric field and electron doping. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2021; 33:105302. [PMID: 33237880 DOI: 10.1088/1361-648x/abcdae] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Edge states of various two-dimensional materials such as graphene are intrinsically spin-polarized. In other materials, electric field and charge doping are required for introducing magnetism to their edges. In this work, by using first-principles calculations, we studied the effects of transverse electric field on the edge states of the armchair blue phosphorene nanoribbon (ABPNR), and found that a transverse electric field drives the edge electronic state occupied and at the same time spin-polarized. We also doped electrons to the ABPNR and found that these additional electrons occupy and spin-polarize the electronic states of both edges of the nanoribbon.
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Affiliation(s)
- Shidong Zhang
- Hunan Key laboratory of Super Micro-structure and Ultrafast Process, School of Physics and Electronics, Central South University, Changsha 410083, People's Republic of China
| | - Yun Li
- Hunan Key laboratory of Super Micro-structure and Ultrafast Process, School of Physics and Electronics, Central South University, Changsha 410083, People's Republic of China
| | - Yun-Peng Wang
- Hunan Key laboratory of Super Micro-structure and Ultrafast Process, School of Physics and Electronics, Central South University, Changsha 410083, People's Republic of China
| | - Jialin Li
- Hunan Key laboratory of Super Micro-structure and Ultrafast Process, School of Physics and Electronics, Central South University, Changsha 410083, People's Republic of China
| | - Mingjun Li
- Hunan Key laboratory of Super Micro-structure and Ultrafast Process, School of Physics and Electronics, Central South University, Changsha 410083, People's Republic of China
| | - Mengqiu Long
- Hunan Key laboratory of Super Micro-structure and Ultrafast Process, School of Physics and Electronics, Central South University, Changsha 410083, People's Republic of China
- Institute of Low-dimensional Quantum Materials and Devices, School of Physical Science and Technology, Xinjiang University, Urumqi, 830046, People's Republic of China
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7
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Kannan V. Adsorption studies on air pollutants using blue phosphorene nanosheet as a chemical sensor – DFT approach. COMPUT THEOR CHEM 2020. [DOI: 10.1016/j.comptc.2020.112910] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
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8
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Exploring adsorption behavior of ethylene dichloride and dibromide vapors on blue phosphorene nanosheets: A first-principles acumens. J Mol Graph Model 2019; 95:107505. [PMID: 31835076 DOI: 10.1016/j.jmgm.2019.107505] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2019] [Revised: 10/23/2019] [Accepted: 11/27/2019] [Indexed: 12/25/2022]
Abstract
The interrelation of toxic vapors ethylene dichloride (EDC) and ethylene dibromide (EDB) with the sensory base material blue phosphorene nanosheet (BLPNS) is studied using ab-initio method. The formational stability of BLPNS is ensured by the negative value of formation energy. Prior to the adsorption studies, we calculated the formation energy of BLPNS to ensure its stability, which is calculated to be -5.194eV/atom and found stable. The main motive behind the present work is to detect these toxic vapors using BLPNS. The intercommunication between the targeted vapors and the base material has been analyzed using the aid of adsorption energy, Bader charge transfer, energy band gap, and variation of band gap along with energy bands and DOS spectrum. The energy gap of isolated BLPNS is observed to be 1.621eV. However, the adsorption of EDC and EDB modulates the energy gap of BLPNS. The nature of assimilation is noticed to be of physisorption, which facilitates desorption of EDC and EDB molecules much easier. The successful outcome of the present research validates that BLPNS can be deployed as a prominent sensor for detection of EDC and EDB effectively.
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9
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Bhuvaneswari R, Nagarajan V, Chandiramouli R. Expedition on surface adsorption of N-nitrosodiethylamine from rubber fumes on blue phosphorene sheets – a first-principles insight. Mol Phys 2019. [DOI: 10.1080/00268976.2019.1699184] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- R. Bhuvaneswari
- School of Electrical & Electronics Engineering, SASTRA Deemed University, Thanjavur, India
| | - V. Nagarajan
- School of Electrical & Electronics Engineering, SASTRA Deemed University, Thanjavur, India
| | - R. Chandiramouli
- School of Electrical & Electronics Engineering, SASTRA Deemed University, Thanjavur, India
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10
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García-Fuente A, Carrete J, Vega A, Gallego LJ. Tunable gap in stable arsenene nanoribbons opens the door to electronic applications. RSC Adv 2019; 9:11818-11823. [PMID: 35517025 PMCID: PMC9063402 DOI: 10.1039/c9ra00975b] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2019] [Accepted: 04/09/2019] [Indexed: 11/21/2022] Open
Abstract
Arsenic has been predicted to present significantly more diverse 2D phases than other elemental compounds like graphene. While practical applications must be based on finite arsenene samples, like nanoribbons, theory has so far focused on the infinite sheet. Our ab initio simulations show the clear contrast between the properties of arsenene nanoribbons and those of the monolayer, ranging from phase stability to electronic structure. We include nanoribbons derived from the buckled, puckered and square/octagon structures of bulk arsenene. The flexibility afforded by different parent structures, widths and edge passivations leads to a rich variety of semiconducting structures with tunable gaps.
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Affiliation(s)
- A García-Fuente
- Departamento de Física, Universidad de Oviedo E-33007 Oviedo Spain
| | - J Carrete
- Institute of Materials Chemistry, TU Wien A-1060 Vienna Austria
| | - A Vega
- Departamento de Física Teórica, Atómica y Óptica, Universidad de Valladolid E-47011 Valladolid Spain
| | - L J Gallego
- Departamento de Física de la Materia Condensada, Facultad de Física, Universidad de Santiago de Compostela E-15782 Santiago de Compostela Spain
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11
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Probing cyanogen chloride gas molecules using blue phosphorene nanosheets based on adsorption properties: A first-principles study. COMPUT THEOR CHEM 2019. [DOI: 10.1016/j.comptc.2019.01.013] [Citation(s) in RCA: 30] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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12
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Le MQ. Reactive molecular dynamics simulations of the mechanical properties of various phosphorene allotropes. NANOTECHNOLOGY 2018; 29:195701. [PMID: 29372890 DOI: 10.1088/1361-6528/aaaacf] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Although various phosphorene allotropes have been theoretically predicted to be stable at 0 K, the mechanical properties and fracture mechanism at room temperature remain unclear for many of them. We investigate through reactive molecular dynamics simulations at room temperature the mechanical properties of phosphorene allotropes including: five sheets with hexagonal structures (β-, γ-, δ-, θ-, and α-phosphorene), one sheet with 4-8 membered rings (4-8-P), and two sheets with 5-7 membered rings. High, moderate and slight anisotropies in their mechanical properties are observed, depending on their crystal structures. Their Young's moduli and tensile strength are approximately in the range from 7.3% through 25%, and from 8.6% through 22% of those of graphene, respectively. At the early stage of fracture, eye-shaped cracks are formed by local bond breaking and perpendicular to the tensile direction in hexagonal and 4-8-P sheets. Complete fractures take place with straight cracks in these hexagonal sheets under tension along the zigzag direction and under tension along the square edge direction in the 4-8-P sheet. Crack meandering and branching are observed during the tension of α-, β-, and γ-phosphorene along the armchair direction; and along the square diagonal direction in the 4-8-P sheet. Under uniaxial tension of two phosphorene sheets with 5-7 atom rings, 12 and 10 membered rings are formed by merging two neighbor heptagons, and a heptagon and its neighbor pentagon, respectively. These 12 and 10 membered rings coalesce subsequently, causing the failure of these two sheets. The results are of great importance in the design of these novel phosphorene allotropes.
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Affiliation(s)
- Minh-Quy Le
- Department of Mechanics of Materials and Structures, School of Mechanical Engineering, Hanoi University of Science and Technology, No. 1, Dai Co Viet Road, Hanoi, Vietnam
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Kaur S, Kumar A, Srivastava S, Pandey R, Tankeshwar K. Stability and carrier transport properties of phosphorene-based polymorphic nanoribbons. NANOTECHNOLOGY 2018; 29:155701. [PMID: 29388562 DOI: 10.1088/1361-6528/aaac43] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Few-layer black phosphorene has recently attracted significant interest in the scientific community. In this paper, we consider several polymorphs of phosphorene nanoribbons (PNRs) and employ deformation potential theory within the effective mass approximation, together with density functional theory, to investigate their structural, mechanical and electronic properties. The results show that the stability of a PNR strongly depends on the direction along which it can be cut from its 2D counterpart. PNRs also exhibit a wide range of line stiffnesses ranging from 6 × 1010 eV m-1 to 18 × 1011 eV m-1, which has little dependence on the edge passivation. Likewise, the calculated electronic properties of PNRs show them to be either a narrow-gap semiconductor (E g < 1 eV) or a wide-gap semiconductor (E g > 1 eV). The carrier mobility of PNRs is found to be comparable to that of black phosphorene. Some of the PNRs show an n-type (p-type) semiconducting character owing to their higher electron (hole) mobility. Passivation of the edges leads to n-type ↔ p-type transition in many of the PNRs considered. The predicted novel characteristics of PNRs, with a wide range of mechanical and electronic properties, make them potentially suitable for use in nanoscale devices.
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Affiliation(s)
- Sumandeep Kaur
- Department of Physics, Panjab University, Chandigarh 160014, India. Department of Physical Sciences, School of Basic and Applied Sciences, Central University of Punjab, Bathinda, 151001, India
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Mogulkoc Y, Modarresi M, Mogulkoc A, Alkan B. Electronic and optical properties of boron phosphide/blue phosphorus heterostructures. Phys Chem Chem Phys 2018; 20:12053-12060. [DOI: 10.1039/c8cp00994e] [Citation(s) in RCA: 37] [Impact Index Per Article: 6.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The dynamically stable boron-phosphide/blue-phosphorus heterostructures are a good UV absorber while being transparent in the visible region.
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Affiliation(s)
- Yesim Mogulkoc
- Department of Engineering Physics
- Faculty of Engineering
- Ankara University
- Ankara
- Turkey
| | - Mohsen Modarresi
- Department of Physics
- Ferdowsi University of Mashhad
- Mashhad
- Iran
- Laboratory of Organic Electronics
| | - Aybey Mogulkoc
- Department of Physics
- Faculty of Sciences
- Ankara University
- Ankara
- Turkey
| | - Bora Alkan
- Department of Engineering Physics
- Faculty of Engineering
- Ankara University
- Ankara
- Turkey
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15
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Kaur S, Kumar A, Srivastava S, Tankeshwar K. van der Waals heterostructures based on allotropes of phosphorene and MoSe 2. Phys Chem Chem Phys 2017; 19:22023-22032. [PMID: 28792050 DOI: 10.1039/c7cp03960c] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The van der Waals heterostructures of allotropes of phosphorene (α- and β-P) with MoSe2 (H-, T-, ZT- and SO-MoSe2) are investigated in the framework of state-of-the-art density functional theory. The semiconducting heterostructures, β-P/H-MoSe2 and α-P/H-MoSe2, form anti-type structures with type I and type II band alignments, respectively, whose bands are tunable with an external electric field. α-P/ZT-MoSe2 and α-P/SO-MoSe2 form ohmic semiconductor-metal contacts while the Schottky barrier in β-P/T-MoSe2 can be reduced to zero by an external electric field to form ohmic contacts which is useful to realize high-performance devices. Simulated STM images of the given heterostructures reveal that α-P can be used as a capping layer to differentiate between various allotropes of underlying MoSe2. The dielectric response of the considered heterostructures is highly anisotropic in terms of lateral and vertical polarization. The tunable electronic and dielectric response of van der Waals phosphorene/MoSe2 heterostructures may find potential applications in the fabrication of optoelectronic devices.
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Affiliation(s)
- Sumandeep Kaur
- Department of Physics, Panjab University, Chandigarh 160014, India.
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16
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Li Y, Ma F. Size and strain tunable band alignment of black-blue phosphorene lateral heterostructures. Phys Chem Chem Phys 2017; 19:12466-12472. [PMID: 28470311 DOI: 10.1039/c7cp00940b] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
Abstract
Single-element lateral heterostructures composed of black and blue phosphorene are not only free from lattice mismatch but also exhibit rich physical properties related to the seamlessly stitched interfaces, providing the building blocks for designing atomically thin devices. Using first-principles calculations, we investigate the influence of interface structure, size effect and strain engineering on the electronic structure, effective masses and band alignment of black-blue phosphorene lateral heterostructures. The lateral heterostructure with an octatomic-ring interface presents a strong metallic feature due to the interface states, while a metal-semiconductor transition takes place in the system with a hexatomic-ring interface upon hydrogen passivation. Following a reciprocal scaling law, the band gap is tuned in a wide energy range by synchronously increasing the widths of black and blue phosphorene or by only widening that of black phosphorene. Moreover, type-II band alignment is observed in the width ranges of 2.0-3.1 nm and 3.7-4.2 nm, out of which it is type-I. However, the band gap and effective masses show small changes if only the width of blue phosphorene is altered. When the lateral heterostructure is tensile loaded, the effective mass ratio of hole to electron is enlarged by an order of magnitude at a strain of 4% along the zigzag direction. Meanwhile, the band alignment undergoes a crossover from type-I to type-II at a strain of 2%, facilitating efficient electron-hole separation for light detection and harvesting.
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Affiliation(s)
- Yan Li
- State Key Laboratory for Mechanical Behavior of Materials, Xi'an Jiaotong University, Xi'an 710049, Shaanxi, China.
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