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Li G, Feng Y, Li L, Du W, Liu H, Sun X, Zhao X, Ma Y, Jia Y, Chen F. Broadband nonlinear optical response and sub-picosecond carrier dynamics in graphene-SnSe 2 van der Waals heterostructures. OPTICS EXPRESS 2024; 32:2867-2883. [PMID: 38297805 DOI: 10.1364/oe.515354] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/06/2023] [Accepted: 12/29/2023] [Indexed: 02/02/2024]
Abstract
The van der Waals (vdWs) heterostructures, with vertical layer stacking structure of various two-dimensional (2D) materials, maintain the reliable photonic characteristics while compensating the shortcomings of the participating individual components. In this work, we combine the less-studied multilayer tin selenide (SnSe2) thin film with one of the traditional 2D materials, graphene, to fabricate the graphene-based vdWs optical switching element (Gr-SnSe2) with superior broadband nonlinear optical response. The transient absorption spectroscopy (TAS) measurement results verify that graphene acts as the recombination channel for the photogenerated carrier in the Gr-SnSe2 sample, and the fast recovery time can be reduced to hundreds of femtoseconds which is beneficial for the optical modulation process. The optical switching properties are characterized by the I-scan measurements, exhibiting a saturable energy intensity of 2.82 mJ·cm-2 (0.425 µJ·cm-2) and a modulation depth of 15.6% (22.5%) at the wavelength of 1030 nm (1980nm). Through integrating Gr-SnSe2 with a cladding waveguide, high-performance picosecond Q-switched operation in the near-infrared (NIR) and mid-infrared (MIR) spectral regions are both achieved. This work experimentally demonstrates the great potential of graphene-based vdWs heterostructures for applications in broadband ultrafast photonics.
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Wan XQ, Yang CL, Li XH, Wang MS, Ma XG. Insights into Photogenerated Carrier Dynamics and Overall Water Splitting of the CrS 3/GeSe Heterostructure. J Phys Chem Lett 2023; 14:9126-9135. [PMID: 37793127 DOI: 10.1021/acs.jpclett.3c01780] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/06/2023]
Abstract
Based on the nonadiabatic molecular dynamics (NAMD) simulations and the first-principles calculations, we explore the overall water-splitting schemes and the photogenerated carrier dynamics for two configurations (CG and CyG) of the CrS3/GeSe van der Waals heterostructures. The photocatalytic direct Z-schemes and carrier migration pathways for hydrogen and oxygen evolution reactions (HER/OER) are constructed based on the electronic properties. The solar-to-hydrogen efficiency (η'STH values) of the schemes can reach 10.60% and 10.17% and further rise under tensile strain. The NAMD results demonstrate similar transfer times of the electron/hole for HER/OER and more rapid electron-hole recombination in CG enables it to be superior to CyG in photocatalytic performance. Moreover, the Gibbs free energy indicates that both the HERs and OERs turn to spontaneously proceed with CG and CyG at pH = 0-12.37 and pH = 2.55-11.01, respectively. These facts reveal that the CrS3/GeSe heterostructure is promising in photocatalytic overall water splitting.
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Affiliation(s)
- Xue-Qing Wan
- School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, China
| | - Chuan-Lu Yang
- School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, China
- Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi 830011, China
| | - Xiao-Hu Li
- Xinjiang Astronomical Observatory, Chinese Academy of Sciences, Urumqi 830011, China
- Key Laboratory of Radio Astronomy, Chinese Academy of Sciences, Urumqi 830011, China
| | - Mei-Shan Wang
- School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, China
| | - Xiao-Guang Ma
- School of Physics and Optoelectronic Engineering, Ludong University, Yantai 264025, China
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Dou W, Zhang L, Song B, Hua C, Wu M, Niu T, Zhou M. Vacancy-Regulated Charge Carrier Dynamics and Suppressed Nonradiative Recombination in Two-Dimensional ReX 2 (X = S, Se). J Phys Chem Lett 2022; 13:10656-10665. [PMID: 36354193 DOI: 10.1021/acs.jpclett.2c02796] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
Point defects in semiconductors usually act as nonradiative charge carrier recombination centers, which severely limit the performance of optoelectronic devices. In this work, by combining time-domain density functional theory with nonadiabatic molecular dynamics simulations, we demonstrate suppressed nonradiative charge carrier recombination and prolonged carrier lifetime in two-dimensional (2D) ReX2 (X = S, Se) with S/Se vacancies. In particular, a S vacancy introduces a shallow hole trap state in ReS2, while a Se vacancy introduces both hole and electron trap states in ReSe2. Photoexcited electrons and holes can be rapidly captured by these defect states, while the release process is slow, which contributes to an elongated photocarrier lifetime. The suppressed charge carrier recombination lies in the vacancy-induced low-frequency phonon modes that weaken electron-phonon coupling, as well as the reduced overlap between electron and hole wave functions that decreases nonadiabatic coupling. This work provides physical insights into the charge carrier dynamics of 2D ReX2, which may stimulate considerable interest in using defect engineering for future optoelectronic nanodevices.
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Affiliation(s)
- Wenzhen Dou
- School of Physics, Beihang University, Beijing100191, China
- Beihang Hangzhou Innovation Institute Yuhang, Hangzhou310023, China
| | - Ling Zhang
- School of Physics, Beihang University, Beijing100191, China
| | - Biyu Song
- School of Physics, Beihang University, Beijing100191, China
- Beihang Hangzhou Innovation Institute Yuhang, Hangzhou310023, China
| | - Chenqiang Hua
- Beihang Hangzhou Innovation Institute Yuhang, Hangzhou310023, China
| | - Meimei Wu
- Beihang Hangzhou Innovation Institute Yuhang, Hangzhou310023, China
| | - Tianchao Niu
- Beihang Hangzhou Innovation Institute Yuhang, Hangzhou310023, China
| | - Miao Zhou
- School of Physics, Beihang University, Beijing100191, China
- Beihang Hangzhou Innovation Institute Yuhang, Hangzhou310023, China
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Dvoretskiy DA, Sazonkin SG, Orekhov IO, Kudelin IS, Denisov LK, Karasik VE, Agafonov VN, Khabashesku VN, Davydov VA. Femtosecond Er-Doped All-Fiber Laser with High-Density Well-Aligned Carbon-Nanotube-Based Thin-Film Saturable Absorber. NANOMATERIALS (BASEL, SWITZERLAND) 2022; 12:3864. [PMID: 36364640 PMCID: PMC9656913 DOI: 10.3390/nano12213864] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 09/25/2022] [Revised: 10/19/2022] [Accepted: 10/24/2022] [Indexed: 06/16/2023]
Abstract
We have studied the ultrafast saturation behavior of a high-density well-aligned single-walled carbon nanotubes saturable absorber (HDWA-SWCNT SA), obtained by a high-pressure and high-temperature treatment of commercially available single-wall carbon nanotubes (SWCNTs) and related it to femtosecond erbium-doped fiber laser performance. We have observed the polarization dependence of a nonlinear optical saturation, along with a low saturation energy level of <1 fJ, limited to the detector threshold used, and the ultrafast response time of <250 fs, while the modulation depth was approximately 12%. We have obtained the generation of ultrashort stretched pulses with a low mode-locking launching threshold of ~100 mW and an average output power of 12.5 mW in an erbium-doped ring laser with the hybrid mode-locking of a VDVA-SWNT SA in combination with the effects of nonlinear polarization evolution. Dechirped pulses with a duration of 180 fs were generated, with a repetition rate of about 42.22 MHz. The average output power standard deviation was about 0.06% RMS during 3 h of measurement.
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Affiliation(s)
- Dmitriy A. Dvoretskiy
- Scientific and Educational Center “Photonics and IR Technology”, Bauman Moscow State Technical University, 105005 Moscow, Russia
| | - Stanislav G. Sazonkin
- Scientific and Educational Center “Photonics and IR Technology”, Bauman Moscow State Technical University, 105005 Moscow, Russia
| | - Ilya O. Orekhov
- Scientific and Educational Center “Photonics and IR Technology”, Bauman Moscow State Technical University, 105005 Moscow, Russia
| | - Igor S. Kudelin
- Department of Physics, University of Colorado, Boulder, CO 80309, USA
| | - Lev K. Denisov
- Scientific and Educational Center “Photonics and IR Technology”, Bauman Moscow State Technical University, 105005 Moscow, Russia
| | - Valeriy E. Karasik
- Scientific and Educational Center “Photonics and IR Technology”, Bauman Moscow State Technical University, 105005 Moscow, Russia
| | | | - Valery N. Khabashesku
- Department of Materials Science and Nanoengineering, Rice University, Houston, TX 77005, USA
| | - Valeriy A. Davydov
- Scientific and Educational Center “Photonics and IR Technology”, Bauman Moscow State Technical University, 105005 Moscow, Russia
- L.F. Vereshchagin Institute for High Pressure Physics, Russian Academy of Sciences, 108840 Moscow, Russia
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Madjet MEA, Ali E, Carignano M, Vendrell O, Chakraborty HS. Ultrafast Transfer and Transient Entrapment of Photoexcited Mg Electron in Mg@C_{60}. PHYSICAL REVIEW LETTERS 2021; 126:183002. [PMID: 34018762 DOI: 10.1103/physrevlett.126.183002] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/06/2020] [Revised: 02/12/2021] [Accepted: 03/26/2021] [Indexed: 06/12/2023]
Abstract
Electron relaxation is studied in endofullerene Mg@C_{60} after an initial localized photoexcitation in Mg by nonadiabatic molecular dynamics simulations. Two approaches to the electronic structure of the excited electronic states are used: (i) an independent particle approximation based on a density-functional theory description of molecular orbitals and (ii) a configuration-interaction description of the many-body effects. Both methods exhibit similar relaxation times, leading to an ultrafast decay and charge transfer from Mg to C_{60} within tens of femtoseconds. Method (i) further elicits a transient trap of the transferred electron that can delay the electron-hole recombination. Results shall motivate experiments to probe these ultrafast processes by two-photon transient absorption or photoelectron spectroscopy in gas phase, in solution, or as thin films.
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Affiliation(s)
- Mohamed El-Amine Madjet
- Max-Planck-Institut für Physik komplexer Systeme, Nöthnitzer Straße 38, 01187 Dresden, Germany
- Department of Natural Sciences, D. L. Hubbard Center for Innovation, Northwest Missouri State University, Maryville, Missouri 64468, USA
| | - Esam Ali
- Department of Natural Sciences, D. L. Hubbard Center for Innovation, Northwest Missouri State University, Maryville, Missouri 64468, USA
| | - Marcelo Carignano
- Department of Biomedical Engineering, Northwestern University, Evanston, Illinois 60208, USA
| | - Oriol Vendrell
- Theoretical Chemistry, Institute of Physical Chemistry and Centre for Advanced Materials, Heidelberg University, Im Neuenheimer Feld 229 and 225, 69120 Heidelberg, Germany
| | - Himadri S Chakraborty
- Department of Natural Sciences, D. L. Hubbard Center for Innovation, Northwest Missouri State University, Maryville, Missouri 64468, USA
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Dou W, Jia Y, Hao X, Meng Q, Wu J, Zhai S, Li T, Hu W, Song B, Zhou M. Time-Domain Ab Initio Insights into the Reduced Nonradiative Electron-Hole Recombination in ReSe 2/MoS 2 van der Waals Heterostructure. J Phys Chem Lett 2021; 12:2682-2690. [PMID: 33689347 DOI: 10.1021/acs.jpclett.1c00455] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Two-dimensional (2D) ReSe2 has attracted considerable interest due to its unique anisotropic mechanical, optical, and exitonic characteristics. Recent transient absorption experiments demonstrated a prolonged lifetime of photoexcited charge carriers by stacking ReSe2 with MoS2, but the underlying mechanism remains elusive. Here, by combining time-domain density functional theory with nonadiabatic molecular dynamics, we investigate the electronic properties and charge carrier dynamics of 2D ReSe2/MoS2 van der Waals (vdW) heterostructure. ReSe2/MoS2 has a type II band alignment that exhibits spatially distinguished conduction and valence band edges, and a built-in electric field is formed due to interface charge transfer. Remarkably, in spite of the decreased band gap and increased decoherence time, we demonstrate that the photocarrier lifetime of ReSe2/MoS2 is ∼5 times longer than that of ReSe2, which originates from the greatly reduced nonadiabatic coupling that suppresses electron-hole recombination, perfectly explaining the experimental results. These findings not only provide physical insights into experiments but also shed light on future design and fabrication of functional optoelectronic devices based on 2D vdW heterostructures.
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Affiliation(s)
- Wenzhen Dou
- School of Physics, Beihang University, Beijing 100191, China
| | - Yizhen Jia
- School of Physics, Beihang University, Beijing 100191, China
| | - Xiamin Hao
- School of Physics, Beihang University, Beijing 100191, China
| | - Qingling Meng
- School of Physics, Beihang University, Beijing 100191, China
| | - Jinge Wu
- School of Physics, Beihang University, Beijing 100191, China
| | - Shuwei Zhai
- School of Physics, Beihang University, Beijing 100191, China
| | - Tianzhao Li
- School of Physics, Beihang University, Beijing 100191, China
| | - Weijuan Hu
- School of Physics, Beihang University, Beijing 100191, China
| | - Biyu Song
- School of Physics, Beihang University, Beijing 100191, China
| | - Miao Zhou
- School of Physics, Beihang University, Beijing 100191, China
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