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Pradhan A, Alboteanu G, Ya'akobovitz A, Niv A. Toward Monolayered Solar Cells: Luminescence Properties and Light Soaking in TMDs. ACS APPLIED MATERIALS & INTERFACES 2024; 16:28435-28440. [PMID: 38768216 DOI: 10.1021/acsami.4c02368] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/22/2024]
Abstract
The optical and photonic characteristics of monolayer transition metal dichalcogenides (TMDs) play a pivotal role in their functionality as solar cell materials, light-emitting diodes (LEDs), and other electro-optical applications. In this study, we reveal the impact of prolonged illumination on the luminescence properties and Raman spectra of monolayered MoS2 and WS2─a process known as "light soaking". We find a light-induced transition from the physisorption to the chemisorption of ambient O2 and H2O molecules. In parallel, we observe the activation and passivation of defect sites in the samples (depending on their initial defect density), which is attributed to the adsorbed ambient molecules and the resulting light-driven interactions with defect sites. Thus, we can control the active defect density of monolayered TMDs and shed light on the fundamental mechanisms underlying their luminescence properties. Therefore, this work clarifies the source of changes to the luminescence properties of TMDs and opens the path toward their integration into advanced applications that may be affected by light soaking, such as solar cells and energy devices.
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Affiliation(s)
- Anway Pradhan
- Department of Mechanical Engineering, Faculty of Engineering Sciences, Ben-Gurion University of the Negev, Beer-Sheva, 8499000, Israel
| | - Guy Alboteanu
- Department of Mechanical Engineering, Faculty of Engineering Sciences, Ben-Gurion University of the Negev, Beer-Sheva, 8499000, Israel
| | - Assaf Ya'akobovitz
- Department of Mechanical Engineering, Faculty of Engineering Sciences, Ben-Gurion University of the Negev, Beer-Sheva, 8499000, Israel
| | - Avi Niv
- Department of Mechanical Engineering, Faculty of Engineering Sciences, Ben-Gurion University of the Negev, Beer-Sheva, 8499000, Israel
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Saliba M, Atanas JP, Howayek TM, Habchi R. Molybdenum disulfide, exfoliation methods and applications to photocatalysis: a review. NANOSCALE ADVANCES 2023; 5:6787-6803. [PMID: 38059039 PMCID: PMC10696921 DOI: 10.1039/d3na00741c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/05/2023] [Accepted: 11/20/2023] [Indexed: 12/08/2023]
Abstract
This review provides a deep analysis of the mechanical and optoelectronic characteristics of MoS2. It offers a comprehensive assessment of diverse exfoliation methods, encompassing chemical, liquid-phase, mechanical, and microwave-driven techniques. The review also explores MoS2's versatile applications across various domains and meticulously examines its significance as a photocatalyst. Notably, it highlights key factors influencing the photocatalytic process. Indeed, the enhanced visible light responsiveness of materials like MoS2 holds immense potential across a wide range of applications. MoS2's remarkable photocatalytic response to visible light, coupled with its notable stability, opens up numerous possibilities in various fields. This unique combination makes MoS2 a promising candidate for applications that require efficient and stable photocatalytic processes, such as environmental remediation, water purification, and energy generation. Its attributes contribute significantly to addressing contemporary challenges and advancing sustainable technologies.
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Affiliation(s)
- Michelle Saliba
- EC2M, Faculty of Sciences, Fanar, Lebanese University 2, Campus Pierre Gemayel 90656 Lebanon
| | - Jean Pierre Atanas
- University of Balamand Dubai, Department of Physics D. I. Park-1 Dubai United Arab Emirates
| | - Tia Maria Howayek
- EC2M, Faculty of Sciences, Fanar, Lebanese University 2, Campus Pierre Gemayel 90656 Lebanon
| | - Roland Habchi
- EC2M, Faculty of Sciences, Fanar, Lebanese University 2, Campus Pierre Gemayel 90656 Lebanon
- Functional Materials Group, Gulf University for Science and Technology Hawally Kuwait
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Chiu CH, Chen YT, Shen JL. Quantum dots derived from two-dimensional transition metal dichalcogenides: synthesis, optical properties and optoelectronic applications. NANOTECHNOLOGY 2023; 34:482001. [PMID: 37607498 DOI: 10.1088/1361-6528/acf29c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Accepted: 08/21/2023] [Indexed: 08/24/2023]
Abstract
Zero-dimensional transition metal dichalcogenides (TMD) quantum dots (QDs) have attracted a lot of attention due to their interesting fundamental properties and various applications. Compared to TMD monolayers, the QD counterpart exhibits larger values for direct transition energies, exciton binding energies, absorption coefficient, luminescence efficiency, and specific surface area. These characteristics make them useful in optoelectronic devices. In this review, recent exciting progress on synthesis, optical properties, and applications of TMD QDs is highlighted. The first part of this article begins with a brief description of the synthesis approaches, which focus on microwave-assistant heating and pulsed laser ablation methods. The second part introduces the fundamental optical properties of TMD QDs, including quantum confinement in optical absorption, excitation-wavelength-dependent photoluminescence, and many-body effects. These properties are highlighted. In the third part, we discuss lastest advancements in optoelectronic devices based on TMD QDs These devices include light-emitting diodes, solar cells, photodetectors, optical sensors, and light-controlled memory devices. Finally, a brief summary and outlook will be provided.
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Affiliation(s)
- Ching-Hsueh Chiu
- Department of Physics, Center for Nanotechnology, and Research Center for Crystalline Materials and Optoelectronic Characterization, Chung Yuan Christian University, Chung-Li, 320314, Taiwan
| | - Yu-Ting Chen
- Department of Physics, Center for Nanotechnology, and Research Center for Crystalline Materials and Optoelectronic Characterization, Chung Yuan Christian University, Chung-Li, 320314, Taiwan
| | - Ji-Lin Shen
- Department of Physics, Center for Nanotechnology, and Research Center for Crystalline Materials and Optoelectronic Characterization, Chung Yuan Christian University, Chung-Li, 320314, Taiwan
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Kim BH, Yang JY, Park KH, Lee D, Song SH. Competitive Effects of Oxidation and Quantum Confinement on Modulation of the Photophysical Properties of Metallic-Phase Tungsten Dichalcogenide Quantum Dots. NANOMATERIALS (BASEL, SWITZERLAND) 2023; 13:2075. [PMID: 37513086 PMCID: PMC10385026 DOI: 10.3390/nano13142075] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/13/2023] [Revised: 07/07/2023] [Accepted: 07/11/2023] [Indexed: 07/30/2023]
Abstract
Metallic-phase transition metal dichalcogenide quantum dots (TMDs-mQDs) have been reported in recent years. However, a dominant mechanism for modulating their intrinsic exciton behaviors has not been determined yet as their size is close to the Bohr radius. Herein, we demonstrate that the oxidation effect prevails over quantum confinement on metallic-phase tungsten dichalcogenide QDs (WX2-mQDs; X = S, Se) when the QD size becomes larger than the exciton Bohr radius. WX2-mQDs with a diameter of ~12 nm show an obvious change in their photophysical properties when the pH of the solution changes from 2 to 11 compared to changing the size from ~3 nm. Meanwhile, we found that quantum confinement is the dominant function for the optical spectroscopic results in the WX2-mQDs with a size of ~3 nm. This is because the oxidation of the larger WX2-mQDs induces sub-energy states, thus enabling excitons to migrate into the lower defect energy states, whereas in WX2-mQDs with a size comparable to the exciton Bohr radius, protonation enhances the quantum confinement.
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Affiliation(s)
- Bo-Hyun Kim
- Division of Advanced Materials Engineering, Center for Advanced Powder Materials and Parts, Kongju National University, Cheonan 32588, Republic of Korea
| | - Jun Yong Yang
- Division of Advanced Materials Engineering, Center for Advanced Powder Materials and Parts, Kongju National University, Cheonan 32588, Republic of Korea
| | - Kwang Hyun Park
- Division of Advanced Materials Engineering, Center for Advanced Powder Materials and Parts, Kongju National University, Cheonan 32588, Republic of Korea
| | - DongJu Lee
- Department of Advanced Materials Engineering, Chungbuk National University, Chungdae-ro 1, Seowon-gu, Cheongju 34057, Republic of Korea
| | - Sung Ho Song
- Division of Advanced Materials Engineering, Center for Advanced Powder Materials and Parts, Kongju National University, Cheonan 32588, Republic of Korea
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Niebur A, Söll A, Haizmann P, Strolka O, Rudolph D, Tran K, Renz F, Frauendorf AP, Hübner J, Peisert H, Scheele M, Lauth J. Untangling the intertwined: metallic to semiconducting phase transition of colloidal MoS 2 nanoplatelets and nanosheets. NANOSCALE 2023; 15:5679-5688. [PMID: 36861175 DOI: 10.1039/d3nr00096f] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
2D semiconducting transition metal dichalcogenides (TMDCs) are highly promising materials for future spin- and valleytronic applications and exhibit an ultrafast response to external (optical) stimuli which is essential for optoelectronics. Colloidal nanochemistry on the other hand is an emerging alternative for the synthesis of 2D TMDC nanosheet (NS) ensembles, allowing for the control of the reaction via tunable precursor and ligand chemistry. Up to now, wet-chemical colloidal syntheses yielded intertwined/agglomerated NSs with a large lateral size. Here, we show a synthesis method for 2D mono- and bilayer MoS2 nanoplatelets with a particularly small lateral size (NPLs, 7.4 nm ± 2.2 nm) and MoS2 NSs (22 nm ± 9 nm) as a reference by adjusting the molybdenum precursor concentration in the reaction. We find that in colloidal 2D MoS2 syntheses initially a mixture of the stable semiconducting and the metastable metallic crystal phase is formed. 2D MoS2 NPLs and NSs then both undergo a full transformation to the semiconducting crystal phase by the end of the reaction, which we quantify by X-ray photoelectron spectroscopy. Phase pure semiconducting MoS2 NPLs with a lateral size approaching the MoS2 exciton Bohr radius exhibit strong additional lateral confinement, leading to a drastically shortened decay of the A and B exciton which is characterized by ultrafast transient absorption spectroscopy. Our findings represent an important step for utilizing colloidal TMDCs, for example small MoS2 NPLs represent an excellent starting point for the growth of heterostructures for future colloidal photonics.
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Affiliation(s)
- André Niebur
- Institute of Physical Chemistry and Electrochemistry, Leibniz University Hannover, Callinstr. 3a, D-30167 Hannover, Germany.
- Cluster of Excellence PhoenixD (Photonics, Optics, and Engineering - Innovation Across Disciplines), Hannover, Germany
| | - Aljoscha Söll
- Institute of Physical Chemistry and Electrochemistry, Leibniz University Hannover, Callinstr. 3a, D-30167 Hannover, Germany.
| | - Philipp Haizmann
- Institute of Physical and Theoretical Chemistry, University of Tübingen, Auf der Morgenstelle 18, D-72076 Tübingen, Germany
| | - Onno Strolka
- Institute of Physical Chemistry and Electrochemistry, Leibniz University Hannover, Callinstr. 3a, D-30167 Hannover, Germany.
- Cluster of Excellence PhoenixD (Photonics, Optics, and Engineering - Innovation Across Disciplines), Hannover, Germany
- Institute of Physical and Theoretical Chemistry, University of Tübingen, Auf der Morgenstelle 18, D-72076 Tübingen, Germany
| | - Dominik Rudolph
- Institute of Physical Chemistry and Electrochemistry, Leibniz University Hannover, Callinstr. 3a, D-30167 Hannover, Germany.
- Cluster of Excellence PhoenixD (Photonics, Optics, and Engineering - Innovation Across Disciplines), Hannover, Germany
| | - Kevin Tran
- Institute of Inorganic Chemistry, Leibniz University Hannover, Callinstr. 9, D-30167 Hannover, Germany
- Laboratory of Nano and Quantum Engineering (LNQE), Leibniz University Hannover, Schneiderberg 39, D-30167 Hannover, Germany
| | - Franz Renz
- Institute of Inorganic Chemistry, Leibniz University Hannover, Callinstr. 9, D-30167 Hannover, Germany
- Laboratory of Nano and Quantum Engineering (LNQE), Leibniz University Hannover, Schneiderberg 39, D-30167 Hannover, Germany
| | - André Philipp Frauendorf
- Institute of Solid State Physics, Leibniz University Hannover, Appelstr. 2, D-30167 Hannover, Germany
| | - Jens Hübner
- Laboratory of Nano and Quantum Engineering (LNQE), Leibniz University Hannover, Schneiderberg 39, D-30167 Hannover, Germany
- Institute of Solid State Physics, Leibniz University Hannover, Appelstr. 2, D-30167 Hannover, Germany
| | - Heiko Peisert
- Institute of Physical and Theoretical Chemistry, University of Tübingen, Auf der Morgenstelle 18, D-72076 Tübingen, Germany
| | - Marcus Scheele
- Institute of Physical and Theoretical Chemistry, University of Tübingen, Auf der Morgenstelle 18, D-72076 Tübingen, Germany
| | - Jannika Lauth
- Institute of Physical Chemistry and Electrochemistry, Leibniz University Hannover, Callinstr. 3a, D-30167 Hannover, Germany.
- Cluster of Excellence PhoenixD (Photonics, Optics, and Engineering - Innovation Across Disciplines), Hannover, Germany
- Institute of Physical and Theoretical Chemistry, University of Tübingen, Auf der Morgenstelle 18, D-72076 Tübingen, Germany
- Laboratory of Nano and Quantum Engineering (LNQE), Leibniz University Hannover, Schneiderberg 39, D-30167 Hannover, Germany
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Li C, Lei Y, Li H, Ni M, Yang D, Xie X, Wang Y, Ma H, Xu W, Xia X. Suppressing Non‐Radiative Relaxation through Single‐Atom Metal Modification for Enhanced Fluorescence Efficiency in Molybdenum Disulfide Quantum Dots. Angew Chem Int Ed Engl 2022; 61:e202207300. [DOI: 10.1002/anie.202207300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/18/2022] [Indexed: 11/12/2022]
Affiliation(s)
- Chao‐Rui Li
- State Key Laboratory of Analytical Chemistry for Life Science School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 P. R. China
| | - Yu‐Li Lei
- Key Laboratory of Mesoscopic Chemistry of MOE School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 P. R. China
| | - Hua Li
- Key Laboratory of Mesoscopic Chemistry of MOE School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 P. R. China
| | - Miao Ni
- State Key Laboratory of Analytical Chemistry for Life Science School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 P. R. China
| | - Dong‐Rui Yang
- State Key Laboratory of Analytical Chemistry for Life Science School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 P. R. China
| | - Xiao‐Yu Xie
- Key Laboratory of Mesoscopic Chemistry of MOE School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 P. R. China
| | - Yuan‐Fan Wang
- Key Laboratory of Mesoscopic Chemistry of MOE School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 P. R. China
| | - Hai‐Bo Ma
- Key Laboratory of Mesoscopic Chemistry of MOE School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 P. R. China
| | - Wei‐Gao Xu
- Key Laboratory of Mesoscopic Chemistry of MOE School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 P. R. China
| | - Xing‐Hua Xia
- State Key Laboratory of Analytical Chemistry for Life Science School of Chemistry and Chemical Engineering Nanjing University Nanjing 210023 P. R. China
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Ko B, Ahn J, Song SH. pH-Dependent Photophysical Properties of Metallic Phase MoSe 2 Quantum Dots. MATERIALS 2022; 15:ma15144945. [PMID: 35888412 PMCID: PMC9318461 DOI: 10.3390/ma15144945] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 06/06/2022] [Revised: 06/30/2022] [Accepted: 07/14/2022] [Indexed: 12/10/2022]
Abstract
Fluorescence properties of quantum dots (QDs) are critically affected by their redox states, which is important for practical applications. In this study, we investigated the optical properties of MoSe2-metallic phase quantum-dots (MoSe2-mQDs) depending on the pH variation, in which the MoSe2-mQDs were dispersed in water with two sizes (Φ~3 nm and 12 nm). The larger MoSe2-mQDs exhibited a large red-shift and broadening of photoluminescence (PL) peak with a constant UV absorption spectra as varying the pH, while the smaller ones showed a small red-shift and peak broadening, but discrete absorption bands in the acidic solution. The excitation wavelength-dependent photoluminescence shows that the PL properties of smaller MoSe2-mQDs are more sensitive to the pH change compared to those of larger ones. From the time-resolved PL spectroscopy, the excitons dominantly decaying with an energy of ~3 eV in pH 2 clearly show the shift of PL peak to the lower energy (~2.6 eV) as the pH increases to 7 and 11 in the smaller MoSe2-mQDs. On the other hand, in the larger MoSe2-mQDs, the exciton decay is less sensitive to the redox states compared to those of the smaller ones. This result shows that the pH variation is more critical to the change of photophysical properties than the size effect in MoSe2-mQDs.
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Li CR, Lei YL, Li H, Ni M, Yang DR, Xie XY, Wang YF, Ma HB, Xu WG, Xia X. Suppressing Non‐Radiative Relaxation through Single‐Atom Metal Modification for Enhanced Fluorescence Efficiency in Molybdenum Disulfide Quantum Dots. Angew Chem Int Ed Engl 2022. [DOI: 10.1002/ange.202207300] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/01/2022]
Affiliation(s)
- Chao-Rui Li
- Nanjing University School of Chemistry and Chemical Engineering CHINA
| | - Yu-Li Lei
- Nanjing University School of Chemistry and Chemical Engineering CHINA
| | - Hua Li
- Nanjing University School of Chemistry and Chemical Engineering CHINA
| | - Miao Ni
- Nanjing University School of Chemistry and Chemical Engineering CHINA
| | - Dong-Rui Yang
- Nanjing University School of Chemistry and Chemical Engineering CHINA
| | - Xiao-Yu Xie
- Nanjing University School of Chemistry and Chemical Engineering CHINA
| | - Yuan-Fan Wang
- Nanjing University School of Chemistry and Chemical Engineering CHINA
| | - Hai-Bo Ma
- Nanjing University School of Chemistry and Chemical Engineering CHINA
| | - Wei-Gao Xu
- Nanjing University School of Chemistry and Chemical Engineering CHINA
| | - Xinghua Xia
- Nanjing University School of Chemistry and Chemical Engineering 163 Xianlin Road 210093 Nanjing CHINA
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