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Zhou M, Jin X, Jia M, Quan D, Liu B, Wei Y, Kong XY, Wen L, Jiang L. Light-Powered Directional Ion Transport via PFN-Br/MoS 2 Heterogeneous Membranes: Band Alignment and Activation Energy Barrier Engineering. ACS APPLIED MATERIALS & INTERFACES 2024; 16:39321-39329. [PMID: 39024512 DOI: 10.1021/acsami.4c05901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/20/2024]
Abstract
Biological photoresponsive ion transport systems consistently attract researchers' attention owing to their remarkable functions of harvesting energy from nature and participating in visual perception systems. Designing and constructing artificial light-driven ion transport devices to mimic biological counterparts remains a challenge owing to fabrication limitations in nanoconfined spaces. Herein, a typical conjugated polyelectrolyte (PFN-Br) was assembled onto a laminated MoS2M using simple solution-processing vacuum filtration, resulting in a heterogeneous three- and two-dimensional nanoporous membrane. The designed band alignment between PFN-Br and MoS2 enables effective directional ion transport under irradiation in an equilibrium solution, even against a 30-fold concentration gradient. The staggered energy structure of PFN-Br and MoS2 enhances charge separation and establishes a photogenerated potential as the driving force for ion transport. Additionally, the activation energy barrier for ion transport across the heterogeneous membrane decreased by 60% after light irradiation, considerably improving ion transport flux. The easy fabrication and high performance of the membrane in light-powered ion transport provide promising approaches for designing nanofluidic devices with possible applications in energy conversion, light-enhanced biosensing, and photoresponsive ionic devices.
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Affiliation(s)
- Min Zhou
- CAS Key Laboratory of Bio-Inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
- School of Future Technology, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Xiaoyan Jin
- CAS Key Laboratory of Bio-Inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
| | - Meijuan Jia
- CAS Key Laboratory of Bio-Inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
| | - Di Quan
- School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, P. R. China
- Suzhou Institute for Advanced Research, University of Science and Technology of China, Suzhou 215123, P. R. China
| | - Biying Liu
- CAS Key Laboratory of Bio-Inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
- School of Future Technology, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
| | - Yan Wei
- NMPA Key Laboratory for Dental Materials National Engineering Laboratory for Digital and Material Technology of Stomatology, Peking University School and Hospital of Stomatology, Beijing 100081, P. R. China
| | - Xiang-Yu Kong
- CAS Key Laboratory of Bio-Inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
- School of Future Technology, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
- School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, P. R. China
- Suzhou Institute for Advanced Research, University of Science and Technology of China, Suzhou 215123, P. R. China
| | - Liping Wen
- CAS Key Laboratory of Bio-Inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
- School of Future Technology, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
- School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, P. R. China
- Suzhou Institute for Advanced Research, University of Science and Technology of China, Suzhou 215123, P. R. China
| | - Lei Jiang
- CAS Key Laboratory of Bio-Inspired Materials and Interfacial Science, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Beijing 100190, P. R. China
- School of Future Technology, University of Chinese Academy of Sciences, Beijing 100049, P. R. China
- School of Chemistry and Materials Science, University of Science and Technology of China, Hefei 230026, P. R. China
- Suzhou Institute for Advanced Research, University of Science and Technology of China, Suzhou 215123, P. R. China
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Xiao X, Latt KZ, Gong J, Kim T, Connell JG, Liu Y, Fry HC, Pearson JE, Wostoupal OS, Li M, Soldan C, Yang Z, Schaller RD, Diroll BT, Hla SW, Xu T. Light-induced Kondo-like exciton-spin interaction in neodymium(II) doped hybrid perovskite. Nat Commun 2024; 15:6084. [PMID: 39030160 PMCID: PMC11271502 DOI: 10.1038/s41467-024-50196-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/10/2023] [Accepted: 07/02/2024] [Indexed: 07/21/2024] Open
Abstract
Tuning the properties of a pair of entangled electron and hole in a light-induced exciton is a fundamentally intriguing inquiry for quantum science. Here, using semiconducting hybrid perovskite as an exploratory platform, we discover that Nd2+-doped CH3NH3PbI3 (MAPbI3) perovskite exhibits a Kondo-like exciton-spin interaction under cryogenic and photoexcitation conditions. The feedback to such interaction between excitons in perovskite and the localized spins in Nd2+ is observed as notably prolonged carrier lifetimes measured by time-resolved photoluminescence, ~10 times to that of pristine MAPbI3 without Nd2+ dopant. From a mechanistic standpoint, such extended charge separation states are the consequence of the trap state enabled by the antiferromagnetic exchange interaction between the light-induced exciton and the localized 4 f spins of the Nd2+ in the proximity. Importantly, this Kondo-like exciton-spin interaction can be modulated by either increasing Nd2+ doping concentration that enhances the coupling between the exciton and Nd2+ 4 f spins as evidenced by elongated carrier lifetime, or by using an external magnetic field that can nullify the spin-dependent exchange interaction therein due to the unified orientations of Nd2+ spin angular momentum, thereby leading to exciton recombination at the dynamics comparable to pristine MAPbI3.
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Affiliation(s)
- Xudong Xiao
- Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, Illinois, USA
| | - Kyaw Zin Latt
- Center for Nanoscale Materials, Argonne National Laboratory, Lemont, Illinois, USA
| | - Jue Gong
- Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, Illinois, USA
| | - Taewoo Kim
- Materials Science Division, Argonne National Laboratory, Lemont, Illinois, USA
| | - Justin G Connell
- Materials Science Division, Argonne National Laboratory, Lemont, Illinois, USA
| | - Yuzi Liu
- Center for Nanoscale Materials, Argonne National Laboratory, Lemont, Illinois, USA
| | - H Christopher Fry
- Center for Nanoscale Materials, Argonne National Laboratory, Lemont, Illinois, USA
| | - John E Pearson
- Center for Nanoscale Materials, Argonne National Laboratory, Lemont, Illinois, USA
| | - Owen S Wostoupal
- Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, Illinois, USA
| | - Mengyuan Li
- Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, Illinois, USA
| | - Calvin Soldan
- Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, Illinois, USA
| | - Zhenzhen Yang
- Chemical Sciences and Engineering Division, Argonne National Laboratory, Lemont, Illinois, USA
| | - Richard D Schaller
- Center for Nanoscale Materials, Argonne National Laboratory, Lemont, Illinois, USA
| | - Benjamin T Diroll
- Center for Nanoscale Materials, Argonne National Laboratory, Lemont, Illinois, USA.
| | - Saw Wai Hla
- Center for Nanoscale Materials, Argonne National Laboratory, Lemont, Illinois, USA.
| | - Tao Xu
- Department of Chemistry and Biochemistry, Northern Illinois University, DeKalb, Illinois, USA.
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Zhang Y, Chen X, Yu Y, Huang Y, Qiu M, Liu F, Feng M, Gao C, Deng S, Fu X. A Femtosecond Electron-Based Versatile Microscopy for Visualizing Carrier Dynamics in Semiconductors Across Spatiotemporal and Energetic Domains. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024:e2400633. [PMID: 38894590 DOI: 10.1002/advs.202400633] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/17/2024] [Revised: 04/16/2024] [Indexed: 06/21/2024]
Abstract
Carrier dynamics detection in different dimensions (space, time, and energy) with high resolutions plays a pivotal role in the development of modern semiconductor devices, especially in low-dimensional, high-speed, and ultrasensitive devices. Here, a femtosecond electron-based versatile microscopy is reported that combines scanning ultrafast electron microscopy (SUEM) imaging and time-resolved cathodoluminescence (TRCL) detection, which allows for visualizing and decoupling different dynamic processes of carriers involved in surface and bulk in semiconductors with unprecedented spatiotemporal and energetic resolutions. The achieved spatial resolution is better than 10 nm, and the temporal resolutions for SUEM imaging and TRCL detection are ≈500 fs and ≈4.5 ps, respectively, representing state-of-the-art performance. To demonstrate its unique capability, the surface and bulk carrier dynamics involved in n-type gallium arsenide (GaAs) are directly tracked and distinguished. It is revealed, in real time and space, that hot carrier cooling, defect trapping, and interband-/defect-assisted radiative recombination in the energy domain result in ordinal super-diffusion, localization, and sub-diffusion of carriers at the surface, elucidating the crucial role of surface states on carrier dynamics. The study not only gives a comprehensive physical picture of carrier dynamics in GaAs, but also provides a powerful platform for exploring complex carrier dynamics in semiconductors for promoting their device performance.
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Affiliation(s)
- Yaqing Zhang
- Ultrafast Electron Microscopy Laboratory, MOE Key Laboratory of Weak-Light Nonlinear Photonics, School of Physics, Nankai University, Tianjin, 300071, China
| | - Xiang Chen
- Ultrafast Electron Microscopy Laboratory, MOE Key Laboratory of Weak-Light Nonlinear Photonics, School of Physics, Nankai University, Tianjin, 300071, China
| | - Yaocheng Yu
- Ultrafast Electron Microscopy Laboratory, MOE Key Laboratory of Weak-Light Nonlinear Photonics, School of Physics, Nankai University, Tianjin, 300071, China
| | - Yue Huang
- Ultrafast Electron Microscopy Laboratory, MOE Key Laboratory of Weak-Light Nonlinear Photonics, School of Physics, Nankai University, Tianjin, 300071, China
| | - Moxi Qiu
- Ultrafast Electron Microscopy Laboratory, MOE Key Laboratory of Weak-Light Nonlinear Photonics, School of Physics, Nankai University, Tianjin, 300071, China
| | - Fang Liu
- Ultrafast Electron Microscopy Laboratory, MOE Key Laboratory of Weak-Light Nonlinear Photonics, School of Physics, Nankai University, Tianjin, 300071, China
| | - Min Feng
- Ultrafast Electron Microscopy Laboratory, MOE Key Laboratory of Weak-Light Nonlinear Photonics, School of Physics, Nankai University, Tianjin, 300071, China
| | - Cuntao Gao
- Ultrafast Electron Microscopy Laboratory, MOE Key Laboratory of Weak-Light Nonlinear Photonics, School of Physics, Nankai University, Tianjin, 300071, China
| | - Shibing Deng
- Ultrafast Electron Microscopy Laboratory, MOE Key Laboratory of Weak-Light Nonlinear Photonics, School of Physics, Nankai University, Tianjin, 300071, China
| | - Xuewen Fu
- Ultrafast Electron Microscopy Laboratory, MOE Key Laboratory of Weak-Light Nonlinear Photonics, School of Physics, Nankai University, Tianjin, 300071, China
- School of Materials Science and Engineering, Smart Sensing Interdisciplinary Science Center, Nankai University, Tianjin, 300350, China
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Dong J, Zhang L, Lau K, Shu Y, Wang S, Fu Z, Wu Z, Liu X, Sa B, Pei J, Zheng J, Zhan H, Wang Q. Tailoring Broadband Nonlinear Optical Characteristics and Ultrafast Photocarrier Dynamics of Bi 2O 2S Nanosheets by Defect Engineering. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2309595. [PMID: 38152956 DOI: 10.1002/smll.202309595] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/23/2023] [Revised: 12/14/2023] [Indexed: 12/29/2023]
Abstract
Low-dimensional bismuth oxychalcogenides have shown promising potential in optoelectronics due to their high stability, photoresponse, and carrier mobility. However, the relevant studies on deep understanding for Bi2O2S is quite limited. Here, comprehensive experimental and computational investigations are conducted in the regulated band structure, nonlinear optical (NLO) characteristics, and carrier dynamics of Bi2O2S nanosheets via defect engineering, taking O vacancy (OV) and substitutional Se doping as examples. As the OV continuously increased to ≈35%, the optical bandgaps progressively narrow from ≈1.21 to ≈0.81 eV and NLO wavelengths are extended to near-infrared regions with enhanced saturable absorption. Simultaneously, the relaxation processes are effectively accelerated from tens of picoseconds to several picoseconds, as the generated defect energy levels can serve as both additional absorption cross-sections and fast relaxation channels supported by theoretical calculations. Furthermore, substitutional Se doping in Bi2O2S nanosheets also modulate their optical properties with the similar trends. As a proof-of-concept, passively mode-locked pulsed lasers in the ≈1.0 µm based on the defect-rich samples (≈35% OV and ≈50% Se-doping) exhibit excellent performance. This work deepens the insight of defect functions on optical properties of Bi2O2S nanosheets and provides new avenues for designing advanced photonic devices based on low-dimensional bismuth oxychalcogenides.
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Affiliation(s)
- Junhao Dong
- College of Materials Science and Engineering, Fuzhou University, Fuzhou, 350108, China
| | - Lesong Zhang
- College of Materials Science and Engineering, Fuzhou University, Fuzhou, 350108, China
| | - Kuenyao Lau
- Institute of Light+X Science and Technology, Faculty of Electrical Engineering and Computer Science, Ningbo University, Ningbo, Zhejiang, 315211, China
| | - Yu Shu
- College of Materials Science and Engineering, Fuzhou University, Fuzhou, 350108, China
| | - Shijin Wang
- College of Materials Science and Engineering, Fuzhou University, Fuzhou, 350108, China
| | - Zhuang Fu
- College of Materials Science and Engineering, Fuzhou University, Fuzhou, 350108, China
| | - Zhanggui Wu
- College of Materials Science and Engineering, Fuzhou University, Fuzhou, 350108, China
| | - Xiaofeng Liu
- School of Materials Science and Engineering, Zhejiang University, Hangzhou, 310027, China
| | - Baisheng Sa
- College of Materials Science and Engineering, Fuzhou University, Fuzhou, 350108, China
| | - Jiajie Pei
- College of Materials Science and Engineering, Fuzhou University, Fuzhou, 350108, China
| | - Jingying Zheng
- College of Materials Science and Engineering, Fuzhou University, Fuzhou, 350108, China
| | - Hongbing Zhan
- College of Materials Science and Engineering, Fuzhou University, Fuzhou, 350108, China
| | - Qianting Wang
- College of Materials Science and Engineering, Fuzhou University, Fuzhou, 350108, China
- College of Materials Science and Engineering, Fujian University of Technology, Fuzhou, 350118, China
- School of Resources & Chemical Engineering, Sanming University, Sanming, 365004, China
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Kang SJ, Jung W, Gwon OH, Kim HS, Byun HR, Kim JY, Jang SG, Shin B, Kwon O, Cho B, Yim K, Yu YJ. Photo-Assisted Ferroelectric Domain Control for α-In 2Se 3 Artificial Synapses Inspired by Spontaneous Internal Electric Fields. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2024; 20:e2307346. [PMID: 38213011 DOI: 10.1002/smll.202307346] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/23/2023] [Revised: 12/17/2023] [Indexed: 01/13/2024]
Abstract
α-In2Se3 semiconductor crystals realize artificial synapses by tuning in-plane and out-of-plane ferroelectricity with diverse avenues of electrical and optical pulses. While the electrically induced ferroelectricity of α-In2Se3 shows synaptic memory operation, the optically assisted synaptic plasticity in α-In2Se3 has also been preferred for polarization flipping enhancement. Here, the synaptic memory behavior of α-In2Se3 is demonstrated by applying electrical gate voltages under white light. As a result, the induced internal electric field is identified at a polarization flipped conductance channel in α-In2Se3/hexagonal boron nitride (hBN) heterostructure ferroelectric field effect transistors (FeFETs) under white light and discuss the contribution of this built-in electric field on synapse characterization. The biased dipoles in α-In2Se3 toward potentiation polarization direction by an enhanced internal built-in electric field under illumination of white light lead to improvement of linearity for long-term depression curves with proper electric spikes. Consequently, upon applying appropriate electric spikes to α-In2Se3/hBN FeFETs with illuminating white light, the recognition accuracy values significantly through the artificial learning simulation is elevated for discriminating hand-written digit number images.
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Affiliation(s)
- Seok-Ju Kang
- Department of Physics, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon, 34134, Republic of Korea
- Institute of Quantum Systems, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon, 34134, Republic of Korea
| | - Wonzee Jung
- Department of Physics, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon, 34134, Republic of Korea
- Energy AI & Computational Science Laboratory, Korea Institute of Energy Research, Daejeon, 34129, Republic of Korea
| | - Oh Hun Gwon
- Department of Physics, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon, 34134, Republic of Korea
| | - Han Seul Kim
- Department of Advanced Material Engineering, Chungbuk National University, Chungdae-ro 1, Seowon-Gu, Cheongju, Chungbuk, 28644, Republic of Korea
| | - Hye Ryung Byun
- Department of Physics, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon, 34134, Republic of Korea
- Institute of Quantum Systems, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon, 34134, Republic of Korea
| | - Jong Yun Kim
- Department of Physics, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon, 34134, Republic of Korea
- Institute of Quantum Systems, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon, 34134, Republic of Korea
| | - Seo Gyun Jang
- Department of Physics, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon, 34134, Republic of Korea
| | - BeomKyu Shin
- Department of Physics, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon, 34134, Republic of Korea
| | - Ojun Kwon
- Department of Advanced Material Engineering, Chungbuk National University, Chungdae-ro 1, Seowon-Gu, Cheongju, Chungbuk, 28644, Republic of Korea
| | - Byungjin Cho
- Department of Advanced Material Engineering, Chungbuk National University, Chungdae-ro 1, Seowon-Gu, Cheongju, Chungbuk, 28644, Republic of Korea
| | - Kanghoon Yim
- Energy AI & Computational Science Laboratory, Korea Institute of Energy Research, Daejeon, 34129, Republic of Korea
| | - Young-Jun Yu
- Department of Physics, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon, 34134, Republic of Korea
- Institute of Quantum Systems, Chungnam National University, 99 Daehak-ro, Yuseong-gu, Daejeon, 34134, Republic of Korea
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6
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Koo Y, Moon T, Kang M, Joo H, Lee C, Lee H, Kravtsov V, Park KD. Dynamical control of nanoscale light-matter interactions in low-dimensional quantum materials. LIGHT, SCIENCE & APPLICATIONS 2024; 13:30. [PMID: 38272869 PMCID: PMC10810844 DOI: 10.1038/s41377-024-01380-x] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2023] [Revised: 11/26/2023] [Accepted: 01/10/2024] [Indexed: 01/27/2024]
Abstract
Tip-enhanced nano-spectroscopy and -imaging have significantly advanced our understanding of low-dimensional quantum materials and their interactions with light, providing a rich insight into the underlying physics at their natural length scale. Recently, various functionalities of the plasmonic tip expand the capabilities of the nanoscopy, enabling dynamic manipulation of light-matter interactions at the nanoscale. In this review, we focus on a new paradigm of the nanoscopy, shifting from the conventional role of imaging and spectroscopy to the dynamical control approach of the tip-induced light-matter interactions. We present three different approaches of tip-induced control of light-matter interactions, such as cavity-gap control, pressure control, and near-field polarization control. Specifically, we discuss the nanoscale modifications of radiative emissions for various emitters from weak to strong coupling regime, achieved by the precise engineering of the cavity-gap. Furthermore, we introduce recent works on light-matter interactions controlled by tip-pressure and near-field polarization, especially tunability of the bandgap, crystal structure, photoluminescence quantum yield, exciton density, and energy transfer in a wide range of quantum materials. We envision that this comprehensive review not only contributes to a deeper understanding of the physics of nanoscale light-matter interactions but also offers a valuable resource to nanophotonics, plasmonics, and materials science for future technological advancements.
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Affiliation(s)
- Yeonjeong Koo
- Department of Physics, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea
| | - Taeyoung Moon
- Department of Physics, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea
| | - Mingu Kang
- Department of Physics, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea
| | - Huitae Joo
- Department of Physics, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea
| | - Changjoo Lee
- Department of Physics, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea
| | - Hyeongwoo Lee
- Department of Physics, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea
| | - Vasily Kravtsov
- School of Physics and Engineering, ITMO University, Saint Petersburg, 197101, Russia
| | - Kyoung-Duck Park
- Department of Physics, Pohang University of Science and Technology (POSTECH), Pohang, 37673, Republic of Korea.
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Wang A, Yao W, Yang Z, Zheng D, Li S, Shi Y, Li D, Wang F. Probing the interlayer excitation dynamics in WS 2/WSe 2 heterostructures with broadly tunable pump and probe energies. NANOSCALE 2023. [PMID: 38050459 DOI: 10.1039/d3nr04878k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/06/2023]
Abstract
van der Waals heterostructures based on transition metal dichalcogenides (TMDs) provide a fascinating platform for exploring new physical phenomena and novel optoelectronic functionalities. Revealing the energy-dependence of photocarrier population dynamics in heterostructures is key for developing optoelectronic or valleytronic devices. Here, the broadband transient dynamics of interlayer excitation of a nearly-aligned WS2/WSe2 heterostructure is investigated by using energy-dependent pump-probe spectroscopy at cryogenic temperatures. Interestingly, WS2/WSe2 interlayer excitation, herein comprising a mixture of intra- and inter-layer excitons, exhibits largely constant lifetimes of a few hundred picoseconds across a broad energy range, in stark contrast to the salient energy-dependent dynamics of intralayer excitons in monolayer WSe2. While the PL emission of the WS2/WSe2 heterostructure is found to be strongly affected by electrostatic doping, the lifetimes of interlayer excitation show negligible changes. Our work elaborates the signatures of ultrafast dynamics introduced by intra- and interlayer co-existing excitonic species and enriches the understanding of interlayer couplings in van der Waals heterostructures.
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Affiliation(s)
- Anran Wang
- School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China.
| | - Wendian Yao
- School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Zidi Yang
- School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Dingqi Zheng
- School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China.
| | - Songlin Li
- School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China.
| | - Yi Shi
- School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China.
| | - Dehui Li
- School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan 430074, China
| | - Fengqiu Wang
- School of Electronic Science and Engineering, Nanjing University, Nanjing 210093, China.
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8
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Chen H, Kuklin A, Xiao J, Al-Hartomy OA, Al-Ghamdi A, Wageh S, Zhang Y, Ågren H, Gao L, Zhang H. Direct Observation of Photon Induced Giant Band Renormalization in 2D PdSe 2 Dichalcogenide by Transient Absorption Spectroscopy. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2023; 19:e2302760. [PMID: 37469206 DOI: 10.1002/smll.202302760] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2023] [Revised: 06/18/2023] [Indexed: 07/21/2023]
Abstract
Insight into fundamental light-matter interaction as well as underlying photo-physical processes is crucial for the development of novel optoelectronic devices. Palladium diselenide (PdSe2 ), an important representative of emerging 2D noble metal dichalcogenides, has gain considerable attention owing to its unique optical, physical, and chemical properties. In this study, 2D PdSe2 nanosheets (NSs) are prepared using the liquid-phase exfoliation method. A broadband carrier relaxation dynamics from visible to near-infrared bands are revealed using a time-resolved transient absorption spectrometer, giving results that indicate band filling and bandgap renormalization (BGR) effects in the 2D PdSe2 NSs. The observed blue-shift of the transient absorption spectra at the primary stage and the subsequent red-shift can be ascribed to this BGR effect. These findings reveal the many-body character of the 2D TMDs material and may hold keys for applications in the field of optoelectronics and ultrafast photonics.
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Affiliation(s)
- Hualong Chen
- Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen, 518060, China
| | - Artem Kuklin
- Department of Physics and Astronomy, Uppsala University, Uppsala, SE-75120, Sweden
| | - Jing Xiao
- College of Physics and Electronic Engineering, Taishan University, Taian, 271000, China
| | - Omar A Al-Hartomy
- Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah, 21589, Saudi Arabia
| | - Ahmed Al-Ghamdi
- Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah, 21589, Saudi Arabia
| | - Swelm Wageh
- Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah, 21589, Saudi Arabia
| | - Yule Zhang
- Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen, 518060, China
| | - Hans Ågren
- Department of Physics and Astronomy, Uppsala University, Uppsala, SE-75120, Sweden
| | - Lingfeng Gao
- College of Material Chemistry and Chemical Engineering, Key Laboratory of Organosilicon Chemistry and Material Technology, Ministry of Education, Key Laboratory of Organosilicon Material Technology, Hangzhou Normal University, Hangzhou, 311121, China
| | - Han Zhang
- Institute of Microscale Optoelectronics, Shenzhen University, Shenzhen, 518060, China
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9
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Zhao C, Yan W, Zhang W, Liu D. Coherent Phonon Manipulation via Electron-Phonon Interaction for Facilitated Relaxation of Metastable Centers in ZnO. NANO LETTERS 2023; 23:8995-9002. [PMID: 37733386 DOI: 10.1021/acs.nanolett.3c02536] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 09/22/2023]
Abstract
Methods that allow versatile manipulation of metastable centers in semiconductors are highly important owing to their potential for quantum information processing and computations. In this study, we demonstrate that the electron-phonon interaction enables phonon participation to promote relaxation of metastable centers in ZnO, which is known for its persistent photoconductivity (PPC) effect. Experimentally, we show that continuous infrared (IR) radiation (1064 nm, ∼30 mW/cm2) promotes longitudinal optical phonons via the Fröhlich interaction and increases the PPC relaxation rate by ∼4 folds. More importantly, we discover that coherent phonons activated by an ultrashort pulse IR laser of the same power increased the relaxation rate by ∼1200-fold, as confirmed by ultrafast transient spectroscopy to be correlated to the excitation of coherent acoustic phonons via the inverse piezoelectric effect. We expect this study to provide valuable guidance for the development of novel quantum and photoactive devices.
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Affiliation(s)
- Chaopeng Zhao
- Institute of Novel Semiconductors, State Key Laboratory of Crystal Materials, Shandong University, 27 South Shanda Road, Jinan, Shandong 250100, P. R. China
| | - Weishan Yan
- Institute of Novel Semiconductors, State Key Laboratory of Crystal Materials, Shandong University, 27 South Shanda Road, Jinan, Shandong 250100, P. R. China
| | - Wangyang Zhang
- Institute of Novel Semiconductors, State Key Laboratory of Crystal Materials, Shandong University, 27 South Shanda Road, Jinan, Shandong 250100, P. R. China
| | - Duo Liu
- Institute of Novel Semiconductors, State Key Laboratory of Crystal Materials, Shandong University, 27 South Shanda Road, Jinan, Shandong 250100, P. R. China
- Jinan Institute of Quantum Technology, Jinan, Shandong 250101, P. R. China
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10
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Bae S, Jeong TY, Raebiger H, Yee KJ, Kim YH. Localized coherent phonon generation in monolayer MoSe 2 from ultrafast exciton trapping at shallow traps. NANOSCALE HORIZONS 2023; 8:1282-1287. [PMID: 37470115 DOI: 10.1039/d3nh00194f] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 07/21/2023]
Abstract
We report spectroscopic evidence for the ultrafast trapping of band edge excitons at defects and the subsequent generation of defect-localized coherent phonons (CPs) in monolayer MoSe2. While the photoluminescence measurement provides signals of exciton recombination at both shallow and deep traps, our time-resolved pump-probe spectroscopy on the sub-picosecond time scale detects localized CPs only from the ultrafast exciton trapping at shallow traps. Based on occupation-constrained density functional calculations, we identify the Se vacancy and the oxygen molecule adsorbed on a Se vacancy as the atomistic origins of deep and shallow traps, respectively. Establishing the correlations between the defect-induced ultrafast exciton trapping and the generation of defect-localized CPs, our work could open up new avenues to engineer photoexcited carriers through lattice defects in two-dimensional materials.
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Affiliation(s)
- Soungmin Bae
- Department of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea.
- Department of Physics, Yokohama National University, Yokohama, Japan
| | - Tae Young Jeong
- Department of Physics, Chungnam National University, Daejeon 34134, Korea.
| | - Hannes Raebiger
- Department of Physics, Yokohama National University, Yokohama, Japan
| | - Ki-Ju Yee
- Department of Physics, Chungnam National University, Daejeon 34134, Korea.
| | - Yong-Hoon Kim
- Department of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST), Daejeon 34141, Korea.
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11
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Wang T, Hopper TR, Mondal N, Liu S, Yao C, Zheng X, Torrisi F, Bakulin AA. Hot Carrier Cooling and Trapping in Atomically Thin WS 2 Probed by Three-Pulse Femtosecond Spectroscopy. ACS NANO 2023; 17:6330-6340. [PMID: 36939760 PMCID: PMC10100566 DOI: 10.1021/acsnano.2c10479] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 10/20/2022] [Accepted: 03/14/2023] [Indexed: 06/18/2023]
Abstract
Transition metal dichalcogenides (TMDs) have shown outstanding semiconducting properties which make them promising materials for next-generation optoelectronic and electronic devices. These properties are imparted by fundamental carrier-carrier and carrier-phonon interactions that are foundational to hot carrier cooling. Recent transient absorption studies have reported ultrafast time scales for carrier cooling in TMDs that can be slowed at high excitation densities via a hot-phonon bottleneck (HPB) and discussed these findings in the light of optoelectronic applications. However, quantitative descriptions of the HPB in TMDs, including details of the electron-lattice coupling and how cooling is affected by the redistribution of energy between carriers, are still lacking. Here, we use femtosecond pump-push-probe spectroscopy as a single approach to systematically characterize the scattering of hot carriers with optical phonons, cold carriers, and defects in a benchmark TMD monolayer of polycrystalline WS2. By controlling the interband pump and intraband push excitations, we observe, in real-time (i) an extremely rapid "intrinsic" cooling rate of ∼18 ± 2.7 eV/ps, which can be slowed with increasing hot carrier density, (ii) the deprecation of this HPB at elevated cold carrier densities, exposing a previously undisclosed role of the carrier-carrier interactions in mediating cooling, and (iii) the interception of high energy hot carriers on the subpicosecond time scale by lattice defects, which may account for the lower photoluminescence yield of TMDs when excited above band gap.
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Affiliation(s)
- Tong Wang
- Department
of Chemistry and Centre for Processable Electronics, Imperial College London, London W12 0BZ, United Kingdom
| | - Thomas R. Hopper
- Department
of Chemistry and Centre for Processable Electronics, Imperial College London, London W12 0BZ, United Kingdom
- Department
of Materials Science and Engineering, Stanford
University, Stanford, California 94305, United States
| | - Navendu Mondal
- Department
of Chemistry and Centre for Processable Electronics, Imperial College London, London W12 0BZ, United Kingdom
| | - Sihui Liu
- Department
of Chemistry and Centre for Processable Electronics, Imperial College London, London W12 0BZ, United Kingdom
| | - Chengning Yao
- Department
of Chemistry and Centre for Processable Electronics, Imperial College London, London W12 0BZ, United Kingdom
| | - Xijia Zheng
- Department
of Chemistry and Centre for Processable Electronics, Imperial College London, London W12 0BZ, United Kingdom
| | - Felice Torrisi
- Department
of Chemistry and Centre for Processable Electronics, Imperial College London, London W12 0BZ, United Kingdom
- Dipartimento
di Fisica e Astronomia, Universita’
di Catania & CNR-IMM (Catania Universita’), Via S. Sofia 64, 95123 Catania, Italy
| | - Artem A. Bakulin
- Department
of Chemistry and Centre for Processable Electronics, Imperial College London, London W12 0BZ, United Kingdom
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12
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Szmytkowski J. Quenching of bright and dark excitons via deep states in the presence of SRH recombination in 2D monolayer materials. JOURNAL OF PHYSICS. CONDENSED MATTER : AN INSTITUTE OF PHYSICS JOURNAL 2022; 51:015601. [PMID: 36301700 DOI: 10.1088/1361-648x/ac9d7e] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/21/2022] [Accepted: 10/25/2022] [Indexed: 06/16/2023]
Abstract
Two-dimensional (2D) monolayer materials are interesting systems due to an existence of optically non-active dark excitonic states. In this work, we formulate a theoretical model of an excitonic Auger process which can occur together with the trap-assisted recombination in such 2D structures. The interactions of intravalley excitons (bright and spin-dark ones) and intervalley excitons (momentum-dark ones) with deep states located in the energy midgap have been taken into account. The explanation of this process is important for the understanding of excitonic and photoelectrical processes which can coexist in 2D materials, like transition metal dichalcogenides and perovskites.
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Affiliation(s)
- Jȩdrzej Szmytkowski
- Faculty of Applied Physics and Mathematics, Gdańsk University of Technology, Narutowicza 11/12, 80-233 Gdańsk, Poland
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13
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Zhang J, Zhang C, Ren K, Lin X, Cui Z. Tunable electronic and magnetic properties of Cr 2Ge 2Te 6monolayer by organic molecular adsorption. NANOTECHNOLOGY 2022; 33:345705. [PMID: 35603764 DOI: 10.1088/1361-6528/ac715d] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/2022] [Accepted: 05/19/2022] [Indexed: 06/15/2023]
Abstract
Recently, two-dimensional materials are widely concerned because of their novel physical properties. Cr2Ge2Te6(CGT) has been studied extensively due to its intrinsic ferromagnetism and ferromagnetic order. In this investigation, the electronic and magnetic performances of organic molecules (TCNE, TCNQ and TTF) adsorbed on CGT monolayer were studied based on the first-principles calculations systematically. The results demonstrate that the CGT presents pronounced tunable electronic and magnetic properties by the adsorption of these macromolecules. Furthermore, the Curie temperature of CGT monolayer can be enhanced significantly by the TTF adsorption. This work can provide a magnetic regulation method for CGT and explore the promising applications of the CGT for spin devices.
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Affiliation(s)
- Jieqi Zhang
- School of Materials Science and Engineering, Anhui University of Science and Technology, Huainan 232001, People's Republic of China
| | - Chao Zhang
- School of Materials Science and Engineering, Anhui University of Science and Technology, Huainan 232001, People's Republic of China
| | - Kai Ren
- School of Mechanical and Electronic Engineering, Nanjing Forestry University, Nanjing, Jiangsu 210042, People's Republic of China
| | - Xiuling Lin
- School of Materials Science and Engineering, Anhui University of Science and Technology, Huainan 232001, People's Republic of China
| | - Zhen Cui
- School of Automation and Information Engineering, Xi'an University of Technology, Xi'an, Shaanxi 710048, People's Republic of China
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14
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Wang X, Gao W, Zhao J. Strain modulation of the exciton anisotropy and carrier lifetime in black phosphorene. Phys Chem Chem Phys 2022; 24:10860-10868. [PMID: 35437538 DOI: 10.1039/d2cp00670g] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023]
Abstract
Manipulating excitons is of great significance to explore the optical properties of 2D materials. In this work, we investigate the excitonic properties and carrier dynamics of bilayer black phosphorene by imposing in-plane biaxial strain. The results show that the strain can modulate not only the contribution of the excitons to optical absorption but also the anisotropic shape of the first exciton. This can be ascribed to the strain effect on the band realignment as well as to changes of the parity and the electron effective mass at the CBM. At the temperature of 300 K, a 3% strain reduces the non-adiabatic coupling between the VBM and CBM and then increases the carrier lifetime by a factor of 13, and the results can be used to estimate the strain effect on the excitonic lifetime. Our results demonstrate that manipulation of the biaxial strain is a promising strategy to modulate the exciton properties of black phosphorene.
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Affiliation(s)
- Xiaolong Wang
- Key Laboratory of Material Modification by Laser, Ion and Electron Beams (Dalian University of Technology), Ministry of Education, Dalian 116024, China.
| | - Weiwei Gao
- Key Laboratory of Material Modification by Laser, Ion and Electron Beams (Dalian University of Technology), Ministry of Education, Dalian 116024, China.
| | - Jijun Zhao
- Key Laboratory of Material Modification by Laser, Ion and Electron Beams (Dalian University of Technology), Ministry of Education, Dalian 116024, China.
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15
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Li D, Zhang W, Suo P, Chen J, Sun K, Zou Y, Ma H, Lin X, Yan X, Zhang S, Li B, Ma G. Ultrafast Dynamics of Defect-Assisted Auger Process in PdSe 2 Films: Synergistic Interaction between Defect Trapping and Auger Effect. J Phys Chem Lett 2022; 13:2757-2764. [PMID: 35315678 DOI: 10.1021/acs.jpclett.2c00315] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
By using optical pump and terahertz probe spectroscopy, we have investigated the photocarrier dynamics in PdSe2 films with different thicknesses. The experimental results reveal that the photocarrier relaxation consists of two components: a fast component of 2.5 ps that shows the layer-thickness independence and a slow component that has typical lifetime of 7.3 ps decreasing with the layer thickness. Interestingly, the relaxation times for both fast and slow components exhibited both pump fluence and temperature independence, which suggests that synergistic interactions between defect trapping and Auger effect dominate the photocarrier dynamics in PdSe2 films. A model involving a defect-assisted Auger process is proposed, which can reproduce the experimental results well. The fitting results reveal that the layer-dependent lifetime is determined by the defect density rather than carrier occupancy rate after photoexcitation. Our results underscore the interplay between the Auger process and defects in two-dimensional semiconductors.
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Affiliation(s)
- Di Li
- Department of Physics, Shanghai University, Shanghai 200444, China
| | - Wenjie Zhang
- Department of Physics, Shanghai University, Shanghai 200444, China
| | - Peng Suo
- Department of Physics, Shanghai University, Shanghai 200444, China
| | - Jiaming Chen
- Department of Physics, Shanghai University, Shanghai 200444, China
| | - Kaiwen Sun
- Department of Physics, Shanghai University, Shanghai 200444, China
| | - Yuqing Zou
- Department of Physics, Shanghai University, Shanghai 200444, China
| | - Hong Ma
- School of Physics and Electronics, Shandong Normal University, Jinan 250014, China
| | - Xian Lin
- Department of Physics, Shanghai University, Shanghai 200444, China
| | - Xiaona Yan
- Department of Physics, Shanghai University, Shanghai 200444, China
| | - Saifeng Zhang
- Department of Physics, Shanghai University, Shanghai 200444, China
| | - Bo Li
- Key Laboratory of Polar Materials and Devices (MOE), Department of Electronics, East China Normal University, Shanghai 200241, China
| | - Guohong Ma
- Department of Physics, Shanghai University, Shanghai 200444, China
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16
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Gao L, Chen H, Kuklin AV, Wageh S, Al-Ghamdi AA, Ågren H, Zhang H. Optical Properties of Few-Layer Ti 3CN MXene: From Experimental Observations to Theoretical Calculations. ACS NANO 2022; 16:3059-3069. [PMID: 35048704 DOI: 10.1021/acsnano.1c10577] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/14/2023]
Abstract
Despite the emerging interest in research and development of Ti3CN MXene nanosheet (NS)-based optoelectronic devices, there is still a lack of in-depth studies of the underlying photophysical processes, like carrier relaxation dynamics and nonlinear photon absorption, operating in such devices, hindering their further and precise design. In this paper, we attempt to remedy the situation by fabricating few-layer Ti3CN NSs via combining selective etching and molecular intercalation and by investigating the carrier relaxation possesses and broadband nonlinear optical responses via transient absorption and Z-scan techniques. These results are complemented by first-principle theoretical analyses of the optical properties. Both saturable absorption and reverse saturable absorption phenomena are observed due to multiphoton absorption effects. The analysis of these results adds to the understanding of the basic photophysical processes, which is anticipated to be beneficial for the further design of MXene-based devices.
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Affiliation(s)
- Lingfeng Gao
- College of Material, Chemistry, and Chemical Engineering, Hangzhou Normal University, No. 2318 Yuhangtang Rd., Cangqian, Yuhang District, Hangzhou 311121, China
| | - Hualong Chen
- College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, P.R. China
| | - Artem V Kuklin
- Department of Physics and Astronomy, Uppsala University, SE-75120 Uppsala, Sweden
- International Research Center of Spectroscopy and Quantum Chemistry (IRC SQC), Siberian Federal University, 79 Svobodny pr., Krasnoyarsk 660041, Russia
| | - Swelm Wageh
- Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Ahmed A Al-Ghamdi
- Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Hans Ågren
- Department of Physics and Astronomy, Uppsala University, SE-75120 Uppsala, Sweden
- College of Chemistry and Chemical Engineering, Henan University, Kaifeng, Henan 475004, China
| | - Han Zhang
- College of Optoelectronic Engineering, Shenzhen University, Shenzhen 518060, P.R. China
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17
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Yang J, Jiang S, Xie J, Jiang H, Xu S, Zhang K, Shi Y, Zhang Y, Zeng Z, Fang G, Wang T, Su F. Identifying the Intermediate Free-Carrier Dynamics Across the Charge Separation in Monolayer MoS 2/ReSe 2 Heterostructures. ACS NANO 2021; 15:16760-16768. [PMID: 34549939 DOI: 10.1021/acsnano.1c06822] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Van der Waals heterostructures composed of different two-dimensional films offer a unique platform for engineering and promoting photoelectric performances, which highly demands the understanding of photocarrier dynamics. Herein, large-scale vertically stacked heterostructures with MoS2 and ReSe2 monolayers are fabricated. Correspondingly, the carrier dynamics have been thoroughly investigated using different ultrafast spectroscopies, including Terahertz (THz) emission spectroscopy, time-resolved THz spectroscopy (TRTS), and near-infrared optical pump-probe spectroscopy (OPPS), providing complementary dynamic information for the out-of-plane charge separation and in-plane charge transport at different stages. The initial charge transfer (CT) within the first 170 fs, generating a transient directional current, is directly demonstrated by the THz emissions. Furthermore, the TRTS explicitly unveils an intermediate free-carrier relaxation pathway, featuring a pronounced augmentation of THz photoconductivity compared to the isolated ReSe2 layer, which likely contains the evolution from immigrant hot charged free carriers to bounded interlayer excitons (∼0.7 ps) and the surface defect trapping (∼13 ps). In addition, the OPPS reveals a distinct enhancement in the saturable absorption along with long-lived dynamics (∼365 ps), which originated from the CT and interlayer exciton recombination. Our work provides comprehensive insight into the photocarrier dynamics across the charge separation and will help with the development of optoelectronic devices based on ReSe2-MoS2 heterostructures.
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Affiliation(s)
- Jin Yang
- Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China
- University of Science and Technology of China, Hefei 230026, China
| | - Shaolong Jiang
- Department of Physics, Southern University of Science and Technology, Shenzhen 518055, China
| | - Jiafeng Xie
- GBA branch of Aerospace Information Research Institute, Chinese Academy of Sciences, Guangzhou 510700, China
| | - Huachao Jiang
- Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China
| | - Shujuan Xu
- Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China
- University of Science and Technology of China, Hefei 230026, China
| | - Kai Zhang
- Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China
| | - Yuping Shi
- Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China
| | - Yanfeng Zhang
- Department of Materials Science and Engineering, College of Engineering, Peking University, Beijing 100871, China
| | - Zhi Zeng
- Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China
| | - Guangyou Fang
- GBA branch of Aerospace Information Research Institute, Chinese Academy of Sciences, Guangzhou 510700, China
| | - Tianwu Wang
- GBA branch of Aerospace Information Research Institute, Chinese Academy of Sciences, Guangzhou 510700, China
| | - Fuhai Su
- Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS, Chinese Academy of Sciences, Hefei 230031, China
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18
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Wang Y, Wang Y, Dong Y, Zhou L, Wei H, Long M, Xiao S, He J. The nonlinear optical transition bleaching in tellurene. NANOSCALE 2021; 13:15882-15890. [PMID: 34519753 DOI: 10.1039/d1nr03639d] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
To date, outstanding linear and nonlinear optical properties of tellurene, caused by multiple two-dimensional (2D) phases and optical anisotropy, have attracted considerable interest for potential nanophotonics applications. In this work, the ultrafast nonlinear optical (NLO) properties of α-tellurene have been studied via Z-scan and pump-probe techniques at a broadband spectral region. Typical saturable absorption and band filling effects are observed in tellurene due to the Pauli exclusion principle. Analysis using density functional theory (DFT) computation shows the enhancements in NLO response within the ultraviolet-visible absorption spectral region are owing to the increased optical intraband transition in tellurene. Moreover, the effects of varying the photon energy of the probe pulse were explored. Our results indicated that probe pulses with higher photon energies can make smaller differential transmission signal, this effect is found to be negatively correlated with calculated joint density of states (JDOS). These results offer insights into the intrinsic photophysics of 2D tellurene, driving its applications in photonic and optoelectronic fields.
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Affiliation(s)
- Yiduo Wang
- Hunan Key Laboratory of Nanophotonics and Devices, School of Physics and Electronics, Central South University, 932 South Lushan Road, Changsha, Hunan 410083, P. R. China.
| | - Yingwei Wang
- Hunan Key Laboratory of Nanophotonics and Devices, School of Physics and Electronics, Central South University, 932 South Lushan Road, Changsha, Hunan 410083, P. R. China.
| | - Yulan Dong
- Key Laboratory of Hunan Province for Statistical Learning and Intelligent Computation, Mathematics and Statistics, Hunan University of Technology and Business, Changsha, Hunan 410205, China.
| | - Li Zhou
- Hunan Key Laboratory of Nanophotonics and Devices, School of Physics and Electronics, Central South University, 932 South Lushan Road, Changsha, Hunan 410083, P. R. China.
| | - Hao Wei
- Hunan Key Laboratory of Nanophotonics and Devices, School of Physics and Electronics, Central South University, 932 South Lushan Road, Changsha, Hunan 410083, P. R. China.
| | - Mengqiu Long
- Hunan Key Laboratory of Nanophotonics and Devices, School of Physics and Electronics, Central South University, 932 South Lushan Road, Changsha, Hunan 410083, P. R. China.
| | - Si Xiao
- Hunan Key Laboratory of Nanophotonics and Devices, School of Physics and Electronics, Central South University, 932 South Lushan Road, Changsha, Hunan 410083, P. R. China.
| | - Jun He
- Hunan Key Laboratory of Nanophotonics and Devices, School of Physics and Electronics, Central South University, 932 South Lushan Road, Changsha, Hunan 410083, P. R. China.
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19
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Chen H, Gao L, Al-Hartomy OA, Zhang F, Al-Ghamdi A, Guo J, Song Y, Wang Z, Algarni H, Wang C, Wageh S, Xu S, Zhang H. Tailoring the ultrafast and nonlinear photonics of MXenes through elemental replacement. NANOSCALE 2021; 13:15891-15898. [PMID: 34522936 DOI: 10.1039/d1nr04224f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Due to the outstanding electronic properties, unique chemical surface termination units and rich elemental compositions, MXenes have become promising candidates for the development of new generation optoelectronic devices. However, there is still a gap between advanced photonics applications and fundamental understanding of ultrafast carrier photo-physics dynamics and a nonlinear optical response in layered MXenes. Here, we present insight into the excited state relaxation processes and nonlinear optical response of few-layer Ti3CN and Ti3C2 nanosheets (NSs) via transient absorption spectroscopy and Z-scan measurements. Owing to similar structural compositions, the transient absorption and nonlinear absorption characteristics behave totally opposite. In addition, photo-induced bandgap renormalization and Pauli blocking phenomena exist in Ti3C2 and Ti3CN NSs, respectively. The element replacement may be a new strategy for tunable carrier kinetics and nonlinear optical response of MXenes. These research studies may provide insight into ultrafast carrier photo-physics dynamics as well as promote MXene-based advanced photonics and their applications in optoelectronic devices.
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Affiliation(s)
- Hualong Chen
- Institute of Microscale Optoelectronics, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, P. R. China.
| | - Lingfeng Gao
- Institute of Microscale Optoelectronics, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, P. R. China.
- College of Material, Chemistry and Chemical Engineering, Hangzhou Normal University, No. 2318 Yuhangtang Rd., Cangqian, Yuhang District, Hangzhou, 311121, China
| | - Omar A Al-Hartomy
- Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Feng Zhang
- Institute of Microscale Optoelectronics, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, P. R. China.
| | - Ahmed Al-Ghamdi
- Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Jia Guo
- Institute of Microscale Optoelectronics, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, P. R. China.
| | - Yufeng Song
- Institute of Microscale Optoelectronics, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, P. R. China.
| | - Zhenhong Wang
- Institute of Microscale Optoelectronics, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, P. R. China.
| | - H Algarni
- Department of Physics, Faculty of Science; Research Center for Advanced Materials Science (RCAMS), King Khalid University, P.O. Box 9004, Abha, Saudi Arabia
| | - Cong Wang
- Institute of Microscale Optoelectronics, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, P. R. China.
| | - Swelm Wageh
- Department of Physics, Faculty of Science, King Abdulaziz University, Jeddah 21589, Saudi Arabia
| | - Shixiang Xu
- Institute of Microscale Optoelectronics, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, P. R. China.
| | - Han Zhang
- Institute of Microscale Optoelectronics, College of Physics and Optoelectronic Engineering, Shenzhen University, Shenzhen, 518060, P. R. China.
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20
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Sun RX, Guo QQ, Huo CF, Yan XQ, Liu ZB, Tian JG. Critical Strain-Induced Photoresponse in Folded Graphene Superlattices. ACS APPLIED MATERIALS & INTERFACES 2021; 13:21573-21581. [PMID: 33929842 DOI: 10.1021/acsami.1c00786] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Strain engineering is the most effective method to break the symmetry of the graphene lattice and achieve graphene band gap tunability. However, a critical strain (>20%) is required to open the graphene band gap, and it is very difficult to achieve such a large strain. This limits the development of experimental research and optoelectronic devices based on graphene strain. In this work, we report a method for preparing large-strain graphene superlattices via surface energy engineering. The maximum strain of the curved lattice could reach 50%. In particular, our pioneering work reports the behavior of an ultrafast (as short as 6 ps) photoresponse in a strained folded graphene superlattice. The photocurrent map shows a large increase (up to 102) of the photoresponsivity in the tensile graphene lattice, which is generated by the interaction between the strained and pristine graphene. Through Raman spectroscopy, Kelvin probe force microscopy, and high-resolution transmission electron microscopy, we demonstrate that the ultrathreshold strain in the graphene bends triggers the opening of the graphene band gap and results in a unique photovoltaic effect. This work deepens the understanding of the strain-induced change of the photoelectrical properties of graphene and proves the potential of strained graphene as a platform for the generation of novel high-speed, miniaturized graphene-based photodetectors.
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Affiliation(s)
- Ruo-Xuan Sun
- The Key Laboratory of Weak Light Nonlinear Photonics, Ministry of Education, School of Physics and Teda Applied Physics Institute, Nankai University, Tianjin 300071, China
| | - Qin-Qin Guo
- The Key Laboratory of Weak Light Nonlinear Photonics, Ministry of Education, School of Physics and Teda Applied Physics Institute, Nankai University, Tianjin 300071, China
| | - Chang-Fu Huo
- The Key Laboratory of Weak Light Nonlinear Photonics, Ministry of Education, School of Physics and Teda Applied Physics Institute, Nankai University, Tianjin 300071, China
| | - Xiao-Qing Yan
- The Key Laboratory of Weak Light Nonlinear Photonics, Ministry of Education, School of Physics and Teda Applied Physics Institute, Nankai University, Tianjin 300071, China
| | - Zhi-Bo Liu
- The Key Laboratory of Weak Light Nonlinear Photonics, Ministry of Education, School of Physics and Teda Applied Physics Institute, Nankai University, Tianjin 300071, China
- Renewable Energy Conversion and Storage Center, Nankai University, Tianjin 300071, China
- The Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, China
| | - Jian-Guo Tian
- The Key Laboratory of Weak Light Nonlinear Photonics, Ministry of Education, School of Physics and Teda Applied Physics Institute, Nankai University, Tianjin 300071, China
- Renewable Energy Conversion and Storage Center, Nankai University, Tianjin 300071, China
- The Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan, Shanxi 030006, China
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