1
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Subagyo R, Maulida PYD, Kowal D, Hartati S, Muslimawati RM, Zetra Y, Diguna LJ, Akhlus S, Mahyuddin MH, Zhang L, Tang CS, Diao C, Wee ATS, Birowosuto MD, Arramel, Rusydi A, Kusumawati Y. Spectroscopic Evidence of Localized Small Polarons in Low-Dimensional Ionic Liquid Lead-Free Hybrid Perovskites. ACS APPLIED MATERIALS & INTERFACES 2023; 15:54677-54691. [PMID: 37966967 DOI: 10.1021/acsami.3c12889] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2023]
Abstract
Rational design is an important approach to consider in the development of low-dimensional hybrid organic-inorganic perovskites (HOIPs). In this study, 1-butyl-1-methyl pyrrolidinium (BMP), 1-(3-aminopropyl)imidazole (API), and 1-butyl-3-methyl imidazolium (BMI) serve as prototypical ionic liquid components in bismuth-based HOIPs. Element-sensitive X-ray absorption spectroscopy measurements of BMPBiBr4 and APIBiBr5 reveal distinct resonant excitation profiles across the N K-edges, where contrasting peak shifts are observed. These 1D-HOIPs exhibit a large Stokes shift due to the small polaron contribution, as probed by photoluminescence spectroscopy at room temperature. Interestingly, the incorporation of a small fraction of tin (Sn) into the APIBiBr5 (Sn/Bi mole ratio of 1:3) structure demonstrates a strong spectral weight transfer accompanied by a fast decay lifetime (2.6 ns). These phenomena are the direct result of Sn-substitution in APIBiBr5, decreasing the small polaron effect. By changing the active ionic liquid, the electronic interactions and optical responses can be moderately tuned by alteration of their intermolecular interaction between the semiconducting inorganic layers and organic moieties.
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Affiliation(s)
- Riki Subagyo
- Department of Chemistry, Faculty of Science and Data Analytics, Institut Teknologi Sepuluh Nopember, Kampus ITS Keputih, Sukolilo, Surabaya 60111, Indonesia
| | | | - Dominik Kowal
- Łukasiewicz Research Network─PORT Polish Center for Technology Development, Stabłowicka 147, Wrocław 54-066, Poland
| | - Sri Hartati
- Nano Center Indonesia, Jl PUSPIPTEK, South Tangerang, Banten 15314, Indonesia
| | - Rossyaila M Muslimawati
- Doctoral Program of Engineering Physics, Faculty of Industrial Technology, Institut Teknologi Bandung, Bandung 40132, Indonesia
- Quantum and Nano Technology Research Group, Faculty of Industrial Technology, Institut Teknologi Bandung, Bandung 40132, Indonesia
| | - Yulfi Zetra
- Department of Chemistry, Faculty of Science and Data Analytics, Institut Teknologi Sepuluh Nopember, Kampus ITS Keputih, Sukolilo, Surabaya 60111, Indonesia
| | - Lina J Diguna
- Department of Renewable Energy Engineering, Universitas Prasetiya Mulya, Kavling Edutown I.1, Jl. BSD Raya Utama, BSD City, Tangerang 15339, Indonesia
| | - Syafsir Akhlus
- Department of Chemistry, Faculty of Science and Data Analytics, Institut Teknologi Sepuluh Nopember, Kampus ITS Keputih, Sukolilo, Surabaya 60111, Indonesia
| | - Muhammad H Mahyuddin
- Quantum and Nano Technology Research Group, Faculty of Industrial Technology, Institut Teknologi Bandung, Bandung 40132, Indonesia
- Research Center for Nanoscience and Nanotechnology, Institut Teknologi Bandung, Bandung 40132, Indonesia
| | - Lei Zhang
- Department of Physics, National University of Singapore, Singapore 117551, Singapore
| | - Chi S Tang
- Singapore Synchrotron Light Source (SSLS), National University of Singapore, Singapore 117603, Singapore
| | - Caozheng Diao
- Singapore Synchrotron Light Source (SSLS), National University of Singapore, Singapore 117603, Singapore
| | - Andrew T S Wee
- Department of Physics, National University of Singapore, Singapore 117551, Singapore
| | - Muhammad D Birowosuto
- Łukasiewicz Research Network─PORT Polish Center for Technology Development, Stabłowicka 147, Wrocław 54-066, Poland
| | - Arramel
- Nano Center Indonesia, Jl PUSPIPTEK, South Tangerang, Banten 15314, Indonesia
| | - Andrivo Rusydi
- Department of Physics, National University of Singapore, Singapore 117551, Singapore
- Singapore Synchrotron Light Source (SSLS), National University of Singapore, Singapore 117603, Singapore
- NUS Graduate School for Integrative Sciences and Engineering, National University of Singapore, Singapore 117456, Singapore
- Centre for Advanced 2D Materials, National University of Singapore, 6 Science Drive 2, Singapore 117546, Singapore
| | - Yuly Kusumawati
- Department of Chemistry, Faculty of Science and Data Analytics, Institut Teknologi Sepuluh Nopember, Kampus ITS Keputih, Sukolilo, Surabaya 60111, Indonesia
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2
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Darminto D, Asih R, Priyanto B, Baqiya MA, Ardiani IS, Nadiyah K, Laila AZ, Prayogi S, Tunmee S, Nakajima H, Fauzi AD, Naradipa MA, Diao C, Rusydi A. Unrevealing tunable resonant excitons and correlated plasmons and their coupling in new amorphous carbon-like for highly efficient photovoltaic devices. Sci Rep 2023; 13:7262. [PMID: 37142605 PMCID: PMC10160088 DOI: 10.1038/s41598-023-31552-5] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Accepted: 03/14/2023] [Indexed: 05/06/2023] Open
Abstract
An understanding on roles of excitons and plasmons is important in excitonic solar cells and photovoltaic (PV) technologies. Here, we produce new amorphous carbon (a-C) like films on Indium Tin Oxide (ITO) generating PV cells with efficiency three order of magnitude higher than the existing biomass-derived a-C. The amorphous carbon films are prepared from the bioproduct of palmyra sap with a simple, environmentally friendly, and highly reproducible method. Using spectroscopic ellipsometry, we measure simultaneously complex dielectric function, loss function as well as reflectivity and reveal coexistence of many-body resonant excitons and correlated-plasmons occurring due to strong electronic correlations. X-ray absorption and photoemission spectroscopies show the nature of electron and hole in defining the energy of the excitons and plasmons as a function of N or B doping. Our result shows new a-C like films and the importance of the coupling of resonant excitons and correlated plasmons in determining efficiency of photovoltaic devices.
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Affiliation(s)
- D Darminto
- Department of Physics, Institut Teknologi Sepuluh Nopember, Surabaya, 60111, Indonesia.
| | - Retno Asih
- Department of Physics, Institut Teknologi Sepuluh Nopember, Surabaya, 60111, Indonesia
| | - Budhi Priyanto
- Department of Physics, Institut Teknologi Sepuluh Nopember, Surabaya, 60111, Indonesia
- Department of Electrical Engineering, Muhammadiyah University, Malang, 65145, Indonesia
| | - Malik A Baqiya
- Department of Physics, Institut Teknologi Sepuluh Nopember, Surabaya, 60111, Indonesia
| | - Irma S Ardiani
- Department of Physics, Institut Teknologi Sepuluh Nopember, Surabaya, 60111, Indonesia
| | - Khoirotun Nadiyah
- Department of Physics, Institut Teknologi Sepuluh Nopember, Surabaya, 60111, Indonesia
| | - Anna Z Laila
- Department of Physics, Institut Teknologi Sepuluh Nopember, Surabaya, 60111, Indonesia
| | - Soni Prayogi
- Department of Physics, Institut Teknologi Sepuluh Nopember, Surabaya, 60111, Indonesia
| | - Sarayut Tunmee
- Synchrotron Light Research Institute, 111 University Avenue, Muang District, Nakhon Ratchasima, 30000, Thailand
| | - Hideki Nakajima
- Synchrotron Light Research Institute, 111 University Avenue, Muang District, Nakhon Ratchasima, 30000, Thailand
| | - Angga D Fauzi
- Advanced Research initiative for Correlated-Electron Systems (ARiCES), Department of Physics, National University of Singapore, Singapore, 117542, Singapore
- Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, Singapore, 117603, Singapore
| | - Muhammad A Naradipa
- Advanced Research initiative for Correlated-Electron Systems (ARiCES), Department of Physics, National University of Singapore, Singapore, 117542, Singapore
- Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, Singapore, 117603, Singapore
| | - Caozheng Diao
- Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, Singapore, 117603, Singapore
| | - Andrivo Rusydi
- Advanced Research initiative for Correlated-Electron Systems (ARiCES), Department of Physics, National University of Singapore, Singapore, 117542, Singapore.
- Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, Singapore, 117603, Singapore.
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3
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Ong BL, Jayaraman K, Diao C, Whitcher TJ, Jain A, Hung H, Breese MBH, Tok ES, Rusydi A. Anomalous Ferromagnetism of quasiparticle doped holes in cuprate heterostructures revealed using resonant soft X-ray magnetic scattering. Nat Commun 2022; 13:4639. [PMID: 35941141 PMCID: PMC9360448 DOI: 10.1038/s41467-022-31885-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2022] [Accepted: 07/04/2022] [Indexed: 11/09/2022] Open
Abstract
We report strong ferromagnetism of quasiparticle doped holes both within the ab-plane and along the c-axis of Cu-O planes in low-dimensional Au/d-La1.8Ba0.2CuO4/LaAlO3(001) heterostructures (d = 4, 8 and 12 unit-cells) using resonant soft X-ray and magnetic scattering together with X-ray magnetic circular dichroism. Interestingly, ferromagnetism is stronger at a hole doped peak and at an upper Hubbard band of O with spin-polarization degree as high as 40%, revealing strong ferromagnetism of Mottness. For in-ab-plane spin-polarizations, the spin of doped holes in O2p-Cu3d-O2p is a triplet state yielding strong ferromagnetism. For out-of-ab-plane spin-polarization, while the spins of doped holes in both O2p-O2p and Cu3d-Cu3d are triplet states, the spin of doped holes in Cu3d-O2p is a singlet state yielding ferrimagnetism. A ferromagnetic-(002) Bragg-peak of the doped holes is observed and enhanced as a function of d revealing strong ferromagnetism coupling between Cu-O layers along the c-axis.
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Affiliation(s)
- B L Ong
- Advanced Research Initiative for Correlated-Electron Systems (ARiCES), Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore, 117551, Singapore.,Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, Singapore, 117603, Singapore
| | - K Jayaraman
- Advanced Research Initiative for Correlated-Electron Systems (ARiCES), Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore, 117551, Singapore.,Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, Singapore, 117603, Singapore
| | - C Diao
- Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, Singapore, 117603, Singapore
| | - T J Whitcher
- Advanced Research Initiative for Correlated-Electron Systems (ARiCES), Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore, 117551, Singapore.,Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, Singapore, 117603, Singapore
| | - A Jain
- Advanced Research Initiative for Correlated-Electron Systems (ARiCES), Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore, 117551, Singapore.,Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, Singapore, 117603, Singapore
| | - H Hung
- Advanced Research Initiative for Correlated-Electron Systems (ARiCES), Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore, 117551, Singapore
| | - M B H Breese
- Advanced Research Initiative for Correlated-Electron Systems (ARiCES), Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore, 117551, Singapore.,Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, Singapore, 117603, Singapore
| | - E S Tok
- Advanced Research Initiative for Correlated-Electron Systems (ARiCES), Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore, 117551, Singapore
| | - A Rusydi
- Advanced Research Initiative for Correlated-Electron Systems (ARiCES), Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore, 117551, Singapore. .,Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, Singapore, 117603, Singapore. .,Centre for Advanced 2D Materials, National University of Singapore, 6 Science Drive 2, Singapore, 117546, Singapore. .,NUS Graduate School for Integrative Sciences and Engineering, Singapore, 117456, Singapore.
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4
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Origin of giant electric-field-induced strain in faulted alkali niobate films. Nat Commun 2022; 13:3922. [PMID: 35798745 PMCID: PMC9262982 DOI: 10.1038/s41467-022-31630-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2021] [Accepted: 06/24/2022] [Indexed: 11/24/2022] Open
Abstract
A large electromechanical response in ferroelectrics is highly desirable for developing high-performance sensors and actuators. Enhanced electromechanical coupling in ferroelectrics is usually obtained at morphotropic phase boundaries requiring stoichiometric control of complex compositions. Recently it was shown that giant piezoelectricity can be obtained in films with nanopillar structures. Here, we elucidate its origin in terms of atomic structure and demonstrate a different system with a greatly enhanced response. This is in non-stoichiometric potassium sodium niobate epitaxial thin films with a high density of self-assembled planar faults. A giant piezoelectric coefficient of ∼1900 picometer per volt is demonstrated at 1 kHz, which is almost double the highest ever reported effective piezoelectric response in any existing thin films. The large oxygen octahedral distortions and the coupling between the structural distortion and polarization orientation mediated by charge redistribution at the planar faults enable the giant electric-field-induced strain. Our findings demonstrate an important mechanism for realizing the unprecedentedly giant electromechanical coupling and can be extended to many other material functions by engineering lattice faults in non-stoichiometric compositions. Maximizing the electromechanical response is crucial for developing piezoelectric devices. Here, the authors demonstrate a giant electric-field-induced strain and its origin in alkali niobate epitaxial thin films with self-assembled planar faults.
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5
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Wei J, Zhong L, Xia H, Lv Z, Diao C, Zhang W, Li X, Du Y, Xi S, Salanne M, Chen X, Li S. Metal-Ion Oligomerization Inside Electrified Carbon Micropores and its Effect on Capacitive Charge Storage. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2107439. [PMID: 34699650 DOI: 10.1002/adma.202107439] [Citation(s) in RCA: 7] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/17/2021] [Revised: 10/19/2021] [Indexed: 06/13/2023]
Abstract
Ion adsorption inside electrified carbon micropores is pivotal for the operation of supercapacitors. Depending on the electrolyte, two main mechanisms have been identified so far, the desolvation of ions in solvents and the formation of superionic states in ionic liquids. Here, it is shown that upon confinement inside negatively charged micropores, transition-metal cations dissolved in water associate to form oligomer species. They are identified using in situ X-ray absorption spectroscopy. The cations associate one with each other via hydroxo bridging, forming ionic oligomers under the synergic effect of spatial confinement and Coulombic screening. The oligomers display sluggish dissociation kinetics and accumulate upon cycling, which leads to supercapacitor capacitance fading. They may be dissolved by applying a positive potential, so an intermittent reverse cycling strategy is proposed to periodically evacuate micropores and revivify the capacitance. These results reveal new insights into ion adsorption and structural evolution with their effects on the electrochemical performance, providing guidelines for designing advanced supercapacitors.
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Affiliation(s)
- Jiaqi Wei
- Innovative Centre for Flexible Devices (iFLEX), School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
- Sorbonne Université, CNRS, Physico-chimie des Electrolytes et Nanosystèmes Interfaciaux, PHENIX, Paris, F-75005, France
| | - Lixiang Zhong
- Innovative Centre for Flexible Devices (iFLEX), School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
| | - Huarong Xia
- Innovative Centre for Flexible Devices (iFLEX), School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
| | - Zhisheng Lv
- Innovative Centre for Flexible Devices (iFLEX), School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
| | - Caozheng Diao
- Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, Singapore, 117603, Singapore
| | - Wei Zhang
- Innovative Centre for Flexible Devices (iFLEX), School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
| | - Xing Li
- Henan Key Laboratory of Diamond Optoelectronics Materials and Devices, Key Laboratory of Material Physics, Ministry of Education, School of Physics and Microelectronics, Zhengzhou University, Zhengzhou, 450052, China
| | - Yonghua Du
- National Synchrotron Light Source II, Brookhaven National Laboratory, Upton, NY, 11973, USA
| | - Shibo Xi
- Institute of Chemical and Engineering Sciences, 1 Pesek Road, Jurong Island, Singapore, 627833, Singapore
| | - Mathieu Salanne
- Sorbonne Université, CNRS, Physico-chimie des Electrolytes et Nanosystèmes Interfaciaux, PHENIX, Paris, F-75005, France
- Institut Universitaire de France (IUF), Cedex 05, Paris, 75231, France
| | - Xiaodong Chen
- Innovative Centre for Flexible Devices (iFLEX), School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
- Institute of Materials Research and Engineering, the Agency for Science, Technology and Research, 2 Fusionopolis Way, Innovis, #08-03, Singapore, 138634, Singapore
| | - Shuzhou Li
- Innovative Centre for Flexible Devices (iFLEX), School of Materials Science and Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore, 639798, Singapore
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6
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Whitcher TJ, Fauzi AD, Caozheng D, Chi X, Syahroni A, Asmara TC, Breese MBH, Neto AHC, Wee ATS, Majidi MA, Rusydi A. Unravelling strong electronic interlayer and intralayer correlations in a transition metal dichalcogenide. Nat Commun 2021; 12:6980. [PMID: 34848717 PMCID: PMC8632915 DOI: 10.1038/s41467-021-27182-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/02/2020] [Accepted: 10/27/2021] [Indexed: 11/23/2022] Open
Abstract
Electronic correlations play important roles in driving exotic phenomena in condensed matter physics. They determine low-energy properties through high-energy bands well-beyond optics. Great effort has been made to understand low-energy excitations such as low-energy excitons in transition metal dichalcogenides (TMDCs), however their high-energy bands and interlayer correlation remain mysteries. Herewith, by measuring temperature- and polarization-dependent complex dielectric and loss functions of bulk molybdenum disulphide from near-infrared to soft X-ray, supported with theoretical calculations, we discover unconventional soft X-ray correlated-plasmons with low-loss, and electronic transitions that reduce dimensionality and increase correlations, accompanied with significantly modified low-energy excitons. At room temperature, interlayer electronic correlations, together with the intralayer correlations in the c-axis, are surprisingly strong, yielding a three-dimensional-like system. Upon cooling, wide-range spectral-weight transfer occurs across a few tens of eV and in-plane p-d hybridizations become enhanced, revealing strong Coulomb correlations and electronic anisotropy, yielding a two-dimensional-like system. Our result shows the importance of strong electronic, interlayer and intralayer correlations in determining electronic structure and opens up applications of utilizing TMDCs on plasmonic nanolithrography.
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Affiliation(s)
- T J Whitcher
- Advanced Research Initiative for Correlated-Electron Systems (ARiCES), Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore, 117576, Singapore.
- Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, Singapore, 117603, Singapore.
- Centre for Advanced 2D Materials, National University of Singapore, 2 Science Drive 3, Singapore, 117546, Singapore.
| | - Angga Dito Fauzi
- Advanced Research Initiative for Correlated-Electron Systems (ARiCES), Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore, 117576, Singapore
- Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, Singapore, 117603, Singapore
| | - D Caozheng
- Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, Singapore, 117603, Singapore
| | - X Chi
- Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, Singapore, 117603, Singapore
- Centre for Advanced 2D Materials, National University of Singapore, 2 Science Drive 3, Singapore, 117546, Singapore
| | - A Syahroni
- Department of Physics, University of Indonesia, Depok, 16424, Indonesia
| | - T C Asmara
- Advanced Research Initiative for Correlated-Electron Systems (ARiCES), Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore, 117576, Singapore
| | - M B H Breese
- Advanced Research Initiative for Correlated-Electron Systems (ARiCES), Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore, 117576, Singapore
- Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, Singapore, 117603, Singapore
| | - A H Castro Neto
- Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, Singapore, 117603, Singapore
- NUSSNI-NanoCore, National University of Singapore, Singapore, 117576, Singapore
| | - A T S Wee
- Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, Singapore, 117603, Singapore
- NUSSNI-NanoCore, National University of Singapore, Singapore, 117576, Singapore
| | - M Aziz Majidi
- Department of Physics, University of Indonesia, Depok, 16424, Indonesia
| | - A Rusydi
- Advanced Research Initiative for Correlated-Electron Systems (ARiCES), Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore, 117576, Singapore.
- Singapore Synchrotron Light Source, National University of Singapore, 5 Research Link, Singapore, 117603, Singapore.
- Centre for Advanced 2D Materials, National University of Singapore, 2 Science Drive 3, Singapore, 117546, Singapore.
- NUSSNI-NanoCore, National University of Singapore, Singapore, 117576, Singapore.
- NUS Graduate School for Integrative Sciences and Engineering, Singapore, 117456, Singapore.
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7
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Ong BL, Naradipa MA, Fauzi AD, Majidi MA, Diao C, Kurumi S, Das PK, Xiao C, Yang P, Breese MBH, Ong SW, Tan KM, Tok ES, Rusydi A. A New Spin-Correlated Plasmon in Novel Highly Oriented Single-Crystalline Gold Quantum Dots. NANO LETTERS 2021; 21:7448-7456. [PMID: 34498884 DOI: 10.1021/acs.nanolett.0c05004] [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
A concept of spin plasmon, a collective mode of spin-density, in strongly correlated electron systems has been proposed since the 1930s. It is expected to bridge between spintronics and plasmonics by strongly confining the photon energy in the subwavelength scale within single magnetic-domain to enable further miniaturizing devices. However, spin plasmon in strongly correlated electron systems is yet to be realized. Herein, we present a new spin correlated-plasmon at room temperature in novel Mott-like insulating highly oriented single-crystalline gold quantum-dots (HOSG-QDs). Interestingly, the spin correlated-plasmon is tunable from the infrared to visible, accompanied by spectral weight transfer yielding a large quantum absorption midgap state, disappearance of low-energy Drude response, and transparency. Supported with theoretical calculations, it occurs due to an interplay of surprisingly strong electron-electron correlations, s-p hybridization and quantum confinement in the s band. The first demonstration of the high sensitivity of spin correlated-plasmon in surface-enhanced Raman spectroscopy is also presented.
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Affiliation(s)
- Bin Leong Ong
- Advanced Research Initiative for Correlated-Electron Systems (ARiCES), Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117551, Singapore
| | - Muhammad Avicenna Naradipa
- Advanced Research Initiative for Correlated-Electron Systems (ARiCES), Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117551, Singapore
| | - Angga Dito Fauzi
- Advanced Research Initiative for Correlated-Electron Systems (ARiCES), Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117551, Singapore
| | - Muhammad Aziz Majidi
- Advanced Research Initiative for Correlated-Electron Systems (ARiCES), Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117551, Singapore
| | - Caozheng Diao
- Advanced Research Initiative for Correlated-Electron Systems (ARiCES), Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117551, Singapore
| | - Satoshi Kurumi
- Advanced Research Initiative for Correlated-Electron Systems (ARiCES), Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117551, Singapore
| | - Pranab Kumar Das
- Advanced Research Initiative for Correlated-Electron Systems (ARiCES), Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117551, Singapore
| | - Chi Xiao
- Advanced Research Initiative for Correlated-Electron Systems (ARiCES), Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117551, Singapore
| | - Ping Yang
- Advanced Research Initiative for Correlated-Electron Systems (ARiCES), Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117551, Singapore
| | - Mark B H Breese
- Advanced Research Initiative for Correlated-Electron Systems (ARiCES), Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117551, Singapore
| | - Sheau Wei Ong
- Advanced Research Initiative for Correlated-Electron Systems (ARiCES), Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117551, Singapore
| | - Khay Ming Tan
- Advanced Research Initiative for Correlated-Electron Systems (ARiCES), Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117551, Singapore
| | - Eng Soon Tok
- Advanced Research Initiative for Correlated-Electron Systems (ARiCES), Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117551, Singapore
| | - Andrivo Rusydi
- Advanced Research Initiative for Correlated-Electron Systems (ARiCES), Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore 117551, Singapore
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8
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Liu H, Wu H, Ong KP, Yang T, Yang P, Das PK, Chi X, Zhang Y, Diao C, Wong WKA, Chew EP, Chen YF, Tan CKI, Rusydi A, Breese MBH, Singh DJ, Chen LQ, Pennycook SJ, Yao K. Giant piezoelectricity in oxide thin films with nanopillar structure. Science 2020; 369:292-297. [PMID: 32675370 DOI: 10.1126/science.abb3209] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/15/2020] [Accepted: 05/19/2020] [Indexed: 11/02/2022]
Abstract
High-performance piezoelectric materials are critical components for electromechanical sensors and actuators. For more than 60 years, the main strategy for obtaining large piezoelectric response has been to construct multiphase boundaries, where nanoscale domains with local structural and polar heterogeneity are formed, by tuning complex chemical compositions. We used a different strategy to emulate such local heterogeneity by forming nanopillar regions in perovskite oxide thin films. We obtained a giant effective piezoelectric coefficient [Formula: see text] of ~1098 picometers per volt with a high Curie temperature of ~450°C. Our lead-free composition of sodium-deficient sodium niobate contains only three elements (Na, Nb, and O). The formation of local heterogeneity with nanopillars in the perovskite structure could be the basis for a general approach to designing and optimizing various functional materials.
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Affiliation(s)
- Huajun Liu
- Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 138634 Singapore.
| | - Haijun Wu
- Department of Materials Science and Engineering, National University of Singapore, 117575 Singapore
| | - Khuong Phuong Ong
- Institute of High Performance Computing, A*STAR (Agency for Science, Technology and Research), 138632 Singapore
| | - Tiannan Yang
- Department of Materials Science and Engineering, Pennsylvania State University, University Park, PA 16802, USA
| | - Ping Yang
- Department of Materials Science and Engineering, National University of Singapore, 117575 Singapore.,Singapore Synchrotron Light Source (SSLS), National University of Singapore, 117603 Singapore
| | - Pranab Kumar Das
- Singapore Synchrotron Light Source (SSLS), National University of Singapore, 117603 Singapore
| | - Xiao Chi
- Department of Physics, National University of Singapore, 117551 Singapore
| | - Yang Zhang
- Department of Materials Science and Engineering, National University of Singapore, 117575 Singapore
| | - Caozheng Diao
- Singapore Synchrotron Light Source (SSLS), National University of Singapore, 117603 Singapore
| | - Wai Kong Alaric Wong
- Singapore Synchrotron Light Source (SSLS), National University of Singapore, 117603 Singapore
| | - Eh Piew Chew
- Singapore Synchrotron Light Source (SSLS), National University of Singapore, 117603 Singapore
| | - Yi Fan Chen
- Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 138634 Singapore
| | - Chee Kiang Ivan Tan
- Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 138634 Singapore
| | - Andrivo Rusydi
- Department of Physics, National University of Singapore, 117551 Singapore
| | - Mark B H Breese
- Singapore Synchrotron Light Source (SSLS), National University of Singapore, 117603 Singapore.,Department of Physics, National University of Singapore, 117551 Singapore
| | - David J Singh
- Department of Physics and Astronomy, University of Missouri, Columbia, MO 65211, USA
| | - Long-Qing Chen
- Department of Materials Science and Engineering, Pennsylvania State University, University Park, PA 16802, USA
| | - Stephen J Pennycook
- Department of Materials Science and Engineering, National University of Singapore, 117575 Singapore
| | - Kui Yao
- Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 138634 Singapore.
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9
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Sun Y, Liao H, Wang J, Chen B, Sun S, Ong SJH, Xi S, Diao C, Du Y, Wang JO, Breese MBH, Li S, Zhang H, Xu ZJ. Covalency competition dominates the water oxidation structure–activity relationship on spinel oxides. Nat Catal 2020. [DOI: 10.1038/s41929-020-0465-6] [Citation(s) in RCA: 140] [Impact Index Per Article: 35.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
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10
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Rodríguez-de Marcos LV, Kalaiselvi SMP, Leong OB, Das PK, Breese MBH, Rusydi A. Optical constants and absorption properties of Te and TeO thin films in the 13-14 nm spectral range. OPTICS EXPRESS 2020; 28:12922-12935. [PMID: 32403778 DOI: 10.1364/oe.381883] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2019] [Accepted: 12/20/2019] [Indexed: 06/11/2023]
Abstract
Undesired mask-induced effects caused by thick absorber layers in EUV photomasks reduce the quality of the projected patterns at the wafer stage in EUV photolithography scanners. New materials with better absorption properties than the state-of-the-art absorbers, TaN and TaBN, are required to mitigate these effects. In this work, we investigated the optical properties (δ and k) of Te and TeO films in the 13-14 nm range, and the absorption properties of these two materials at 13.5 nm. δ and k are obtained through fitting experimental values of reflectivity versus angle of incidence in the EUV range. We follow a methodology which combines different characterization techniques (X-ray reflectivity, EUV reflectivity, and X-ray photoemission spectroscopy) to reduce the number of free parameters in models and hence, increase the reliability of the optical constants obtained. At 13.5 nm, we obtain δ=0.03120, k = 0.07338 for Te, and δ=0.04099, k = 0.06555 for TeO. To experimentally verify the absorption properties of these materials, different thicknesses of Te and TeO films are cast on top of a state-of-the-art mask-quality EUV multilayer with 66.7% reflectivity at 13.5 nm. We found that a reflectivity of ∼0.7% can be attained with either 32.4 nm of Te, or 34.7 nm of TeO, greatly surpassing the absorption properties of TaN and TaBN. The morphology and surface roughness of the Te and TeO films deposited on the multilayer are also investigated.
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11
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Xie A, Yin X, Tang CS, Fauzi AD, Chi X, Diao C, Sahdan MF, Birowosuto MD, Dang C, Rusydi A, Wee ATS. Electronic Modulation in Site-Selective Occupation of Quasi-2D Triangular-Lattice Cs 2CuCl 4-xBr x Perovskite Probed by Surface-Sensitive Characterization. ACS APPLIED MATERIALS & INTERFACES 2020; 12:4114-4122. [PMID: 31927903 DOI: 10.1021/acsami.9b19517] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
A controllable electronic manipulation in a frustrated magnetic system such as solution-based two-dimensional (2D) all-inorganic perovskites offers a possible route for their integrations with electronic and magnetic devices for their advanced applications. Here, we perform element-specific investigations of an emergent class of quasi-2D all-inorganic perovskites Cs2CuCl4-xBrx with (0 ≤ x ≤ 4) using a combination of synchrotron-radiation photoelectron techniques. Surface- and element-sensitive X-ray absorption spectroscopy spectra of Cu L2,3 edges indicate strong electronic transition that is largely influenced by their halogen content at room temperature. This implies that site-selective occupation largely dominates the electronic transition across the unoccupied states of these series since chlorine atoms possess a stronger electronegative character than bromine atoms. Moreover, the implication of halogen site is reflected in the valence band of Cl-rich copper perovskite in which the valence band edge is closer to Fermi energy (EF) than that of the Br-rich compound. Furthermore, X-ray magnetic circular dichroism spectra of mixed ratio and Br-rich compounds exhibit antiferromagnetism at room temperature. These site-specific magnetic-spectroscopic results are corroborated by density functional theory calculations. The strong electronic modulation and the local magnetic spectroscopy results in these solution-based and low-temperature-growth materials will pave the way toward energy- and cost-efficient perovskite devices.
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Affiliation(s)
- Aozhen Xie
- CINTRA UMI CNRS/NTU/THALES , Singapore 637553 , Singapore
- School of Electrical and Electronic Engineering , Nanyang Technological University , Singapore 639798 , Singapore
- Energy Research Institute@NTU (ERI@N) , Nanyang Technological University , Singapore 637553 , Singapore
| | - Xinmao Yin
- Department of Physics , National University of Singapore , 2 Science Drive 3 , Singapore 117542 , Singapore
- Singapore Synchrotron Light Source (SSLS) , National University of Singapore , 5 Research Link , Singapore 117603 , Singapore
| | - Chi Sin Tang
- Department of Physics , National University of Singapore , 2 Science Drive 3 , Singapore 117542 , Singapore
- Singapore Synchrotron Light Source (SSLS) , National University of Singapore , 5 Research Link , Singapore 117603 , Singapore
- NUS Graduate School for Integrative Sciences and Engineering , National University of Singapore , Singapore 117456 , Singapore
| | - Angga Dito Fauzi
- Department of Physics , National University of Singapore , 2 Science Drive 3 , Singapore 117542 , Singapore
- Singapore Synchrotron Light Source (SSLS) , National University of Singapore , 5 Research Link , Singapore 117603 , Singapore
| | - Xiao Chi
- Singapore Synchrotron Light Source (SSLS) , National University of Singapore , 5 Research Link , Singapore 117603 , Singapore
- Centre for Advanced 2D Materials and Graphene Research Centre , National University of Singapore , 6 Science Drive 2 , Singapore 117546 , Singapore
| | - Caozheng Diao
- Singapore Synchrotron Light Source (SSLS) , National University of Singapore , 5 Research Link , Singapore 117603 , Singapore
| | - Muhammad Fauzi Sahdan
- Department of Physics , National University of Singapore , 2 Science Drive 3 , Singapore 117542 , Singapore
| | - Muhammad Danang Birowosuto
- Department of Physics , National University of Singapore , 2 Science Drive 3 , Singapore 117542 , Singapore
- Energy Research Institute@NTU (ERI@N) , Nanyang Technological University , Singapore 637553 , Singapore
| | - Cuong Dang
- CINTRA UMI CNRS/NTU/THALES , Singapore 637553 , Singapore
- School of Electrical and Electronic Engineering , Nanyang Technological University , Singapore 639798 , Singapore
- Energy Research Institute@NTU (ERI@N) , Nanyang Technological University , Singapore 637553 , Singapore
| | - Andrivo Rusydi
- Department of Physics , National University of Singapore , 2 Science Drive 3 , Singapore 117542 , Singapore
- Singapore Synchrotron Light Source (SSLS) , National University of Singapore , 5 Research Link , Singapore 117603 , Singapore
- NUS Graduate School for Integrative Sciences and Engineering , National University of Singapore , Singapore 117456 , Singapore
- NUSNNI-NanoCore , National University of Singapore , Singapore 117411 , Singapore
| | - Andrew Thye Shen Wee
- Department of Physics , National University of Singapore , 2 Science Drive 3 , Singapore 117542 , Singapore
- Centre for Advanced 2D Materials and Graphene Research Centre , National University of Singapore , 6 Science Drive 2 , Singapore 117546 , Singapore
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