1
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Rigoni F, Zappa D, Baratto C, Faglia G, Comini E. Single ZnO Nanowire for Electrical and Optical NO 2 Gas Sensing: Origin of Reversible and Irreversible Gas Effects Investigated by Photoluminescence Spectroscopy. ACS Sens 2024; 9:4646-4654. [PMID: 39259026 DOI: 10.1021/acssensors.4c00901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 09/12/2024]
Abstract
In this work, the gas sensing properties of a single ZnO nanowire (NW) are investigated, simultaneously in terms of photoluminescence (PL) and photocurrent (PC) response to NO2 gas, with the purpose of giving new insights on the gas sensing mechanism of a single 1D ZnO nanostructure. A single ZnO NW sensing device was fabricated, characterized, and compared with a sample made of bundles of ZnO NWs. UV near-band-edge PL emission spectroscopy was carried out at room temperature and by lowering the temperature down to 77 K, which allows detection of resolved PL peaks related to different excitonic transition regions. Surface effects were observed in PL maps, considering different nano and microstructures. Electrical and optical measurements were acquired at the same time during the NO2 gas exposure, allowing for the comparison of PL and PC response times and signal recovery. During NO2 gas desorption, irreversible behavior in the surface-related and donor-acceptor pair (DAP) regions is interpreted as the effect of an initial transient when electronic transfer from the gas molecules to the bulk occurs through the ZnO NW surface which acts as a channel. To the best of our knowledge, this is the first work which investigates the simultaneous PL optical and PC electrical response signals of a single ZnO NW to gas exposure.
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Affiliation(s)
- Federica Rigoni
- Sensor Lab., Dept. of Information Engineering, University of Brescia, 25133 Brescia, Italy
| | - Dario Zappa
- Sensor Lab., Dept. of Information Engineering, University of Brescia, 25133 Brescia, Italy
| | | | - Guido Faglia
- Sensor Lab., Dept. of Information Engineering, University of Brescia, 25133 Brescia, Italy
| | - Elisabetta Comini
- Sensor Lab., Dept. of Information Engineering, University of Brescia, 25133 Brescia, Italy
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2
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Gierster L, Turkina O, Deinert J, Vempati S, Baeta E, Garmshausen Y, Hecht S, Draxl C, Stähler J. Right On Time: Ultrafast Charge Separation Before Hybrid Exciton Formation. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2024; 11:e2403765. [PMID: 38874072 PMCID: PMC11336905 DOI: 10.1002/advs.202403765] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/07/2024] [Indexed: 06/15/2024]
Abstract
Organic/inorganic hybrid systems offer great potential for novel solar cell design combining the tunability of organic chromophore absorption properties with high charge carrier mobilities of inorganic semiconductors. However, often such material combinations do not show the expected performance: while ZnO, for example, basically exhibits all necessary properties for a successful application in light-harvesting, it was clearly outpaced by TiO2 in terms of charge separation efficiency. The origin of this deficiency has long been debated. This study employs femtosecond time-resolved photoelectron spectroscopy and many-body ab initio calculations to identify and quantify all elementary steps leading to the suppression of charge separation at an exemplary organic/ZnO interface. It is demonstrated that charge separation indeed occurs efficiently on ultrafast (350 fs) timescales, but that electrons are recaptured at the interface on a 100 ps timescale and subsequently trapped in a strongly bound (0.7 eV) hybrid exciton state with a lifetime exceeding 5 µs. Thus, initially successful charge separation is followed by delayed electron capture at the interface, leading to apparently low charge separation efficiencies. This finding provides a sufficiently large time frame for counter-measures in device design to successfully implement specifically ZnO and, moreover, invites material scientists to revisit charge separation in various kinds of previously discarded hybrid systems.
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Affiliation(s)
- Lukas Gierster
- Department of ChemistryHumboldt‐Universität zu BerlinBrook‐Taylor‐Str. 212489BerlinGermany
- Department of Physical ChemistryFritz‐Haber‐Institut der Max‐Planck‐GesellschaftFaradayweg 4‐614195BerlinGermany
| | - Olga Turkina
- Department of PhysicsHumboldt‐Universität zu BerlinNewtonstr. 1512489BerlinGermany
| | - Jan‐Christoph Deinert
- Department of Physical ChemistryFritz‐Haber‐Institut der Max‐Planck‐GesellschaftFaradayweg 4‐614195BerlinGermany
| | - Sesha Vempati
- Department of Physical ChemistryFritz‐Haber‐Institut der Max‐Planck‐GesellschaftFaradayweg 4‐614195BerlinGermany
| | - Elsie Baeta
- Department of Physical ChemistryFritz‐Haber‐Institut der Max‐Planck‐GesellschaftFaradayweg 4‐614195BerlinGermany
| | - Yves Garmshausen
- Department of ChemistryHumboldt‐Universität zu BerlinBrook‐Taylor‐Str. 212489BerlinGermany
| | - Stefan Hecht
- Department of ChemistryHumboldt‐Universität zu BerlinBrook‐Taylor‐Str. 212489BerlinGermany
- Center for the Science of Materials BerlinHumboldt‐Universität zu BerlinZum Großen Windkanal 212489BerlinGermany
| | - Claudia Draxl
- Department of PhysicsHumboldt‐Universität zu BerlinNewtonstr. 1512489BerlinGermany
- Center for the Science of Materials BerlinHumboldt‐Universität zu BerlinZum Großen Windkanal 212489BerlinGermany
| | - Julia Stähler
- Department of ChemistryHumboldt‐Universität zu BerlinBrook‐Taylor‐Str. 212489BerlinGermany
- Department of Physical ChemistryFritz‐Haber‐Institut der Max‐Planck‐GesellschaftFaradayweg 4‐614195BerlinGermany
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3
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Kahraman A, Socie E, Nazari M, Kazazis D, Buldu-Akturk M, Kabanova V, Biasin E, Smolentsev G, Grolimund D, Erdem E, Moser JE, Cannizzo A, Bacellar C, Milne C. Tailoring p-Type Behavior in ZnO Quantum Dots through Enhanced Sol-Gel Synthesis: Mechanistic Insights into Zinc Vacancies. J Phys Chem Lett 2024; 15:1755-1764. [PMID: 38324709 PMCID: PMC10875662 DOI: 10.1021/acs.jpclett.3c03519] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/15/2023] [Revised: 01/18/2024] [Accepted: 01/19/2024] [Indexed: 02/09/2024]
Abstract
The synthesis and control of properties of p-type ZnO is crucial for a variety of optoelectronic and spintronic applications; however, it remains challenging due to the control of intrinsic midgap (defect) states. In this study, we demonstrate a synthetic route to yield colloidal ZnO quantum dots (QD) via an enhanced sol-gel process that effectively eliminates the residual intermediate reaction molecules, which would otherwise weaken the excitonic emission. This process supports the creation of ZnO with p-type properties or compensation of inherited n-type defects, primarily due to zinc vacancies under oxygen-rich conditions. The in-depth analysis of carrier recombination in the midgap across several time scales reveals microsecond carrier lifetimes at room temperature which are expected to occur via zinc vacancy defects, supporting the promoted p-type character of the synthesized ZnO QDs.
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Affiliation(s)
| | - Etienne Socie
- École
polytechnique fédérale de Lausanne (EPFL), Rte Cantonale, 1015 Lausanne, Switzerland
| | - Maryam Nazari
- Institute
of Applied Physics, University of Bern, Sidlerstrasse 5, 3012 Bern, Switzerland
| | | | - Merve Buldu-Akturk
- Faculty
of Engineering and Natural Sciences, Sabanci
University, Tuzla 34956 Istanbul, Turkey
| | | | - Elisa Biasin
- Physical
Sciences Division, Pacific Northwest National
Laboratory, Richland, Washington 99352, United States
| | | | | | - Emre Erdem
- Faculty
of Engineering and Natural Sciences, Sabanci
University, Tuzla 34956 Istanbul, Turkey
| | - Jacques E. Moser
- École
polytechnique fédérale de Lausanne (EPFL), Rte Cantonale, 1015 Lausanne, Switzerland
| | - Andrea Cannizzo
- Institute
of Applied Physics, University of Bern, Sidlerstrasse 5, 3012 Bern, Switzerland
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4
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Milne CJ, Nagornova N, Pope T, Chen HY, Rossi T, Szlachetko J, Gawelda W, Britz A, van Driel TB, Sala L, Ebner S, Katayama T, Southworth SH, Doumy G, March AM, Lehmann CS, Mucke M, Iablonskyi D, Kumagai Y, Knopp G, Motomura K, Togashi T, Owada S, Yabashi M, Nielsen MM, Pajek M, Ueda K, Abela R, Penfold TJ, Chergui M. Disentangling the evolution of electrons and holes in photoexcited ZnO nanoparticles. STRUCTURAL DYNAMICS (MELVILLE, N.Y.) 2023; 10:064501. [PMID: 37941994 PMCID: PMC10628992 DOI: 10.1063/4.0000204] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/13/2023] [Accepted: 10/06/2023] [Indexed: 11/10/2023]
Abstract
The evolution of charge carriers in photoexcited room temperature ZnO nanoparticles in solution is investigated using ultrafast ultraviolet photoluminescence spectroscopy, ultrafast Zn K-edge absorption spectroscopy, and ab initio molecular dynamics (MD) simulations. The photoluminescence is excited at 4.66 eV, well above the band edge, and shows that electron cooling in the conduction band and exciton formation occur in <500 fs, in excellent agreement with theoretical predictions. The x-ray absorption measurements, obtained upon excitation close to the band edge at 3.49 eV, are sensitive to the migration and trapping of holes. They reveal that the 2 ps transient largely reproduces the previously reported transient obtained at 100 ps time delay in synchrotron studies. In addition, the x-ray absorption signal is found to rise in ∼1.4 ps, which we attribute to the diffusion of holes through the lattice prior to their trapping at singly charged oxygen vacancies. Indeed, the MD simulations show that impulsive trapping of holes induces an ultrafast expansion of the cage of Zn atoms in <200 fs, followed by an oscillatory response at a frequency of ∼100 cm-1, which corresponds to a phonon mode of the system involving the Zn sub-lattice.
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Affiliation(s)
| | - Natalia Nagornova
- Lausanne Centre for Ultrafast Science (LACUS), ISIC, FSB, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Thomas Pope
- Chemistry—School of Natural and Environmental Sciences, Newcastle University, Newcastle upon Tyne, NE1 7RU, United Kingdom
| | - Hui-Yuan Chen
- Lausanne Centre for Ultrafast Science (LACUS), ISIC, FSB, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | - Thomas Rossi
- Lausanne Centre for Ultrafast Science (LACUS), ISIC, FSB, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
| | | | | | | | - Tim B. van Driel
- Department of Physics, Technical University of Denmark, 2800 Kongens Lyngby, Denmark
| | - Leonardo Sala
- SwissFEL, Paul Scherrer Institut, 5232 Villigen-PSI, Switzerland
| | - Simon Ebner
- SwissFEL, Paul Scherrer Institut, 5232 Villigen-PSI, Switzerland
| | | | | | - Gilles Doumy
- Argonne National Laboratory, 9700 S. Cass Ave., Argonne, Illinois 60439, USA
| | - Anne Marie March
- Argonne National Laboratory, 9700 S. Cass Ave., Argonne, Illinois 60439, USA
| | | | - Melanie Mucke
- Department of Physics and Astronomy, Uppsala University, 751 20 Uppsala, Sweden
| | - Denys Iablonskyi
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
| | - Yoshiaki Kumagai
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
| | - Gregor Knopp
- SwissFEL, Paul Scherrer Institut, 5232 Villigen-PSI, Switzerland
| | - Koji Motomura
- Institute of Multidisciplinary Research for Advanced Materials, Tohoku University, Sendai 980-8577, Japan
| | - Tadashi Togashi
- Department of Physics, Technical University of Denmark, 2800 Kongens Lyngby, Denmark
| | - Shigeki Owada
- RIKEN, SPring-8 Center, Kouto 1-1-1, Sayo, Hyogo 679-5148, Japan
| | - Makina Yabashi
- RIKEN, SPring-8 Center, Kouto 1-1-1, Sayo, Hyogo 679-5148, Japan
| | - Martin M. Nielsen
- Department of Physics, Technical University of Denmark, 2800 Kongens Lyngby, Denmark
| | - Marek Pajek
- Faculty of Physics, Adam Mickiewicz University, Uniwersytetu Poznańskiego 2, Poznań, 61-614, Poland
| | | | - Rafael Abela
- SwissFEL, Paul Scherrer Institut, 5232 Villigen-PSI, Switzerland
| | - Thomas J. Penfold
- Chemistry—School of Natural and Environmental Sciences, Newcastle University, Newcastle upon Tyne, NE1 7RU, United Kingdom
| | - Majed Chergui
- Lausanne Centre for Ultrafast Science (LACUS), ISIC, FSB, Ecole Polytechnique Fédérale de Lausanne, CH-1015 Lausanne, Switzerland
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5
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ROS-mediated antibacterial response of ZnO and ZnO containing cerium under light. CHEMICAL PAPERS 2022. [DOI: 10.1007/s11696-022-02390-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/03/2022]
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6
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Relaxation and Transport of Excitonic Polaron in Monolayer Transition Metal Dichalcogenides. IRANIAN JOURNAL OF SCIENCE AND TECHNOLOGY, TRANSACTIONS A: SCIENCE 2022. [DOI: 10.1007/s40995-022-01283-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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7
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Li J, Chen H, Triana CA, Patzke GR. Hematite Photoanodes for Water Oxidation: Electronic Transitions, Carrier Dynamics, and Surface Energetics. Angew Chem Int Ed Engl 2021; 60:18380-18396. [PMID: 33761172 DOI: 10.1002/anie.202101783] [Citation(s) in RCA: 21] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2021] [Indexed: 11/08/2022]
Abstract
We review the current understanding of charge carriers in model hematite photoanodes at different stages. The origin of charge carriers is discussed based on the electronic structure and absorption features, highlighting the controversial assignment of the electronic transitions near the absorption edge. Next, the dynamic evolution of charge carriers is analyzed both on the ultrafast and on the surface reaction timescales, with special emphasis on the arguable spectroscopic assignment of electrons/holes and their kinetics. Further, the competitive charge transfer centers at the solid-liquid interface are reviewed, and the chemical nature of relevant surface states is updated. Finally, an overview on the function of widely employed surface cocatalysts is given to illustrate the complex influence of physiochemical modifications on the charge carrier dynamics. The understanding of charge carriers from their origin all the way to their interfacial transfer is vital for the future of photoanode design.
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Affiliation(s)
- Jingguo Li
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057, Zurich, Switzerland
| | - Hang Chen
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057, Zurich, Switzerland
| | - Carlos A Triana
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057, Zurich, Switzerland
| | - Greta R Patzke
- Department of Chemistry, University of Zurich, Winterthurerstrasse 190, CH-8057, Zurich, Switzerland
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8
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Li J, Chen H, Triana CA, Patzke GR. Hematite Photoanodes for Water Oxidation: Electronic Transitions, Carrier Dynamics, and Surface Energetics. Angew Chem Int Ed Engl 2021. [DOI: 10.1002/ange.202101783] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
Affiliation(s)
- Jingguo Li
- Department of Chemistry University of Zurich Winterthurerstrasse 190 CH-8057 Zurich Switzerland
| | - Hang Chen
- Department of Chemistry University of Zurich Winterthurerstrasse 190 CH-8057 Zurich Switzerland
| | - Carlos A. Triana
- Department of Chemistry University of Zurich Winterthurerstrasse 190 CH-8057 Zurich Switzerland
| | - Greta R. Patzke
- Department of Chemistry University of Zurich Winterthurerstrasse 190 CH-8057 Zurich Switzerland
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9
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Gu C, Zhang H, Liu Y, Yu J, Pan J, Luo G, Shen Q, Tang J, Hu J. Time-Domain Observation of Spectral Diffusion in Defective ZnO. ACS OMEGA 2021; 6:15442-15447. [PMID: 34151122 PMCID: PMC8210433 DOI: 10.1021/acsomega.1c01890] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 04/10/2021] [Accepted: 05/18/2021] [Indexed: 06/13/2023]
Abstract
Defects can affect all aspects of materials by altering their electronic structures and mediating the carrier dynamics. However, in the past decades, most research efforts were restricted to nonstoichiometric defects, while the effects of high-density defects on the carrier dynamics of semiconductors remained elusive. In this work, using transient absorption spectroscopy, we have observed for the first time a hybrid carrier relaxation dynamics with the feature of a Poisson-like retard shoulder in a time-domain profile in highly defective ZnO crystals. This novel behavior has been attributed to the spectral diffusion within continuum defect states, which is further confirmed by a proposed diffusion (in energy space) controlled carrier dynamic model. Our results thus reveal an alternative energy decay channel in highly defective crystals and may provide a new route for defect engineering.
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Affiliation(s)
- Chun Gu
- Laboratory
for Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, China
- State
Key Laboratory for Environment-Friendly Energy Materials, Southwest University of Science and Technology, Mianyang 621010, China
- State
Key Laboratory of Advanced Technology for Materials Synthesis and
Processing, Wuhan University of Technology, Wuhan 430070, China
| | - Hang Zhang
- Laboratory
for Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, China
- State
Key Laboratory for Environment-Friendly Energy Materials, Southwest University of Science and Technology, Mianyang 621010, China
| | - Yonggang Liu
- State
Key Laboratory for Environment-Friendly Energy Materials, Southwest University of Science and Technology, Mianyang 621010, China
| | - Junhong Yu
- Laboratory
for Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, China
| | - Junheng Pan
- Institute
of Technological Science, Wuhan University, Wuhan 430072, China
| | - Guoqiang Luo
- State
Key Laboratory of Advanced Technology for Materials Synthesis and
Processing, Wuhan University of Technology, Wuhan 430070, China
| | - Qiang Shen
- State
Key Laboratory of Advanced Technology for Materials Synthesis and
Processing, Wuhan University of Technology, Wuhan 430070, China
| | - Jau Tang
- Institute
of Technological Science, Wuhan University, Wuhan 430072, China
| | - Jianbo Hu
- Laboratory
for Shock Wave and Detonation Physics, Institute of Fluid Physics, China Academy of Engineering Physics, Mianyang 621900, China
- State
Key Laboratory for Environment-Friendly Energy Materials, Southwest University of Science and Technology, Mianyang 621010, China
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10
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Abstract
Band bending at semiconductor surfaces induced by chemical doping or electric fields can create metallic surfaces with properties not found in the bulk, such as high electron mobility, magnetism or superconductivity. Optical generation of such metallic surfaces on ultrafast timescales would be appealing for high-speed electronics. Here, we demonstrate the ultrafast generation of a metal at the (10-10) surface of ZnO upon photoexcitation. Compared to hitherto known ultrafast photoinduced semiconductor-to-metal transitions that occur in the bulk of inorganic semiconductors, the metallization of the ZnO surface is launched by 3-4 orders of magnitude lower photon fluxes. Using time- and angle-resolved photoelectron spectroscopy, we show that the phase transition is caused by photoinduced downward surface band bending due to photodepletion of donor-type deep surface defects. The discovered mechanism is in analogy to chemical doping of semiconductor surfaces and presents a general route for controlling surface-confined metallicity on ultrafast timescales.
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11
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Schwermann C, Linden S, Doltsinis NL, Zacharias H. On-Surface Chemistry Induced by Long-Lived Excitons: (NO) 2 Dissociation on C 60. J Phys Chem Lett 2020; 11:5490-5496. [PMID: 32584044 DOI: 10.1021/acs.jpclett.0c01247] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
Solid-state excitonic excitations play an increasingly important role in optoelectronic and light harvesting processes due to their ubiquitous presence in dipolar two-dimensional materials. Here we show that long-lived solid-state excitons induce chemical reactions in adsorbed molecules and thus convert light into chemical energy. For the model system (NO)2 dimer adsorbed on ordered c(4×4) C60 films, time-of-flight measurements following UV laser excitation reveal a slow and a fast dissociative desorption channel, which are assigned to intersystem crossing and internal conversion, respectively, by time-dependent density functional theory calculations.
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Affiliation(s)
- Christian Schwermann
- Institute of Solid State Theory and Center for Multiscale Theory and Computation, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Straße 10, 48149 Münster, Germany
| | - Steffen Linden
- Institute of Physics, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Straße 10, 48149 Münster, Germany
| | - Nikos L Doltsinis
- Institute of Solid State Theory and Center for Multiscale Theory and Computation, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Straße 10, 48149 Münster, Germany
| | - Helmut Zacharias
- Institute of Physics, Westfälische Wilhelms-Universität Münster, Wilhelm-Klemm-Straße 10, 48149 Münster, Germany
- Center for Soft Nanoscience, Westfälische Wilhelms-Universität, Busso-Peus-Straße 10, 48149 Münster, Germany
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12
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Liu Q, Wang Z, Chen H, Wang H, Song H, Ye J, Weng Y. Rules for Selecting Metal Cocatalyst Based on Charge Transfer and Separation Efficiency between ZnO Nanoparticles and Noble Metal Cocatalyst Ag/ Au/ Pt. ChemCatChem 2020. [DOI: 10.1002/cctc.202000280] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Qianxia Liu
- The Laboratory of Soft Matter Physics Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Science Beijing 100190 P. R. China
- School of Physical Science University of Chinese Academy of Sciences Beijing 100049 P. R. China
| | - Zhuan Wang
- The Laboratory of Soft Matter Physics Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Science Beijing 100190 P. R. China
| | - Hailong Chen
- The Laboratory of Soft Matter Physics Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Science Beijing 100190 P. R. China
- Songshan Lake Materials Laboratory (Dongguan) Guangdong 523808 P. R. China
| | - Hao‐Yi Wang
- The Laboratory of Soft Matter Physics Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Science Beijing 100190 P. R. China
| | - Hui Song
- International Center for Materials Nanoarchitectonics (WPI-MANA) National Institute for Materials Science (NIMS) 1-1 Namiki Tsukuba Ibaraki 305-0044 Japan
| | - Jinhua Ye
- International Center for Materials Nanoarchitectonics (WPI-MANA) National Institute for Materials Science (NIMS) 1-1 Namiki Tsukuba Ibaraki 305-0044 Japan
- Collaborative Innovation Center of Chemical Science and Engineering (Tianjin) Tianjin 300072 P. R. China
| | - Yuxiang Weng
- The Laboratory of Soft Matter Physics Beijing National Laboratory for Condensed Matter Physics Institute of Physics Chinese Academy of Science Beijing 100190 P. R. China
- School of Physical Science University of Chinese Academy of Sciences Beijing 100049 P. R. China
- Songshan Lake Materials Laboratory (Dongguan) Guangdong 523808 P. R. China
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13
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Junek J, Ondič L, Žídek K. Random temporal laser speckles for the robust measurement of sub-microsecond photoluminescence decay. OPTICS EXPRESS 2020; 28:12363-12372. [PMID: 32403734 DOI: 10.1364/oe.382811] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/14/2019] [Accepted: 03/26/2020] [Indexed: 06/11/2023]
Abstract
Time-resolved photoluminescence (PL) is commonly used to track dynamics in a broad range of materials. Thus, the search for simplification of the acquisition of PL kinetics attracts continuous attention. This paper presents a new robust and straightforward approach to the measurement of PL decay, which is based on randomly fluctuating excitation intensity. The random excitation waveform is attained by using laser speckles generated on a rotating diffuser. Owing to this, the presented technique is able to utilize any coherent excitation source without the necessity to generate short pulses or to controllably modulate the light. PL decay can be computationally reconstructed from the Fourier image of the PL trace. The paper demonstrates the performance of the method, which is able to acquire sub-microsecond dynamics as the impulse response function reaches 300 ns. The reconstructed PL decays were compared to streak camera measurements to verify the method. Finally, potential limitations and applications of the technique are discussed.
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