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Daoud A, Cheknane A, Meftah A, Michel Nunzi J, Hilal HS. Dye-sensitized solar cell performance improvement by dye-solvent polarity and redox mediator potential alignment. J Photochem Photobiol A Chem 2023. [DOI: 10.1016/j.jphotochem.2023.114732] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/31/2023]
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2
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Stanculescu A, Socol M, Rasoga O, Breazu C, Preda N, Stanculescu F, Socol G, Vacareanu L, Girtan M, Doroshkevich AS. Arylenevinylene Oligomer-Based Heterostructures on Flexible AZO Electrodes. MATERIALS (BASEL, SWITZERLAND) 2021; 14:7688. [PMID: 34947285 PMCID: PMC8709386 DOI: 10.3390/ma14247688] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/02/2021] [Revised: 11/29/2021] [Accepted: 12/08/2021] [Indexed: 12/05/2022]
Abstract
We investigated the optical and electrical properties of flexible single and bi-layer organic heterostructures prepared by vacuum evaporation with a p-type layer of arylenevinylene oligomers, based on carbazole, 3,3' bis(N hexylcarbazole)vinylbenzene = L13, or triphenylamine, 1,4 bis [4 (N,N' diphenylamino)phenylvinyl] benzene = L78, and an n-type layer of 5,10,15,20-tetra(4-pyrydil)21H,23H-porphyne = TPyP. Transparent conductor films of Al-doped ZnO (AZO) with high transparency, >90% for wavelengths > 400 nm, and low resistivity, between 6.9 × 10-4 Ω·cm and 23 × 10-4 Ω·cm, were deposited by pulsed laser deposition on flexible substrates of polyethylene terephthalate (PET). The properties of the heterostructures based on oligomers and zinc phthalocyanine (ZnPc) were compared, emphasizing the effect of the surface morphology. The measurements revealed a good absorption in the visible range of the PET/AZO/arylenevinylene oligomer/TPyP heterostructures and a typical injection contact behavior with linear (ZnPc, L78) or non-linear (L13) J-V characteristics in the dark, at voltages < 0.4 V. The heterostructure PET/AZO/L78/TPyP/Al showed a current density of ~1 mA/cm2 at a voltage of 0.3 V. The correlation between the roughness exponent, evaluated from the height-height correlation function, grain shape, and electrical behavior was analyzed. Consequently, the oligomer based on triphenylamine could be a promising replacement of donor ZnPc in flexible electronic applications.
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Affiliation(s)
- Anca Stanculescu
- Optical Processes in Nanostructured Materials Laboratory, National Institute of Materials Physics, 405A Atomistilor Street, P.O. Box MG-7, 077125 Magurele, Romania; (M.S.); (O.R.); (C.B.); (N.P.)
| | - Marcela Socol
- Optical Processes in Nanostructured Materials Laboratory, National Institute of Materials Physics, 405A Atomistilor Street, P.O. Box MG-7, 077125 Magurele, Romania; (M.S.); (O.R.); (C.B.); (N.P.)
| | - Oana Rasoga
- Optical Processes in Nanostructured Materials Laboratory, National Institute of Materials Physics, 405A Atomistilor Street, P.O. Box MG-7, 077125 Magurele, Romania; (M.S.); (O.R.); (C.B.); (N.P.)
| | - Carmen Breazu
- Optical Processes in Nanostructured Materials Laboratory, National Institute of Materials Physics, 405A Atomistilor Street, P.O. Box MG-7, 077125 Magurele, Romania; (M.S.); (O.R.); (C.B.); (N.P.)
| | - Nicoleta Preda
- Optical Processes in Nanostructured Materials Laboratory, National Institute of Materials Physics, 405A Atomistilor Street, P.O. Box MG-7, 077125 Magurele, Romania; (M.S.); (O.R.); (C.B.); (N.P.)
| | - Florin Stanculescu
- Faculty of Physics, University of Bucharest, 405 Atomistilor Street, P.O. Box MG-11, 077125 Magurele, Romania;
| | - Gabriel Socol
- Optical Processes in Nanostructured Materials Laboratory, National Institute for Laser, Plasma and Radiation Physics, 409 Atomistilor Street, P.O. Box MG-36, 077125 Magurele, Romania;
| | - Loredana Vacareanu
- Electroactive Polymers and Plasmochemistry, P. Poni Institute of Macromolecular Chemistry, 41 A Gr. Ghica Voda Alley, 700487 Iasi, Romania;
| | - Mihaela Girtan
- Laboratoire LPHIA, Université d’Angers, LUNAM 2, Bd. Lavoisier, 49045 Angers, France;
| | - Aleksandr S. Doroshkevich
- Frank Laboratory of Neutron Physics, Joint Institute for Nuclear Research, 6 Joliot-Curie Str., 141980 Dubna, Russia;
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Temperton RH, Hart J, Verykokkos N, Gibson E, O'Shea JN. A soft x-ray probe of a titania photoelectrode sensitized with a triphenylamine dye. J Chem Phys 2021; 154:234707. [PMID: 34241265 DOI: 10.1063/5.0050531] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
Abstract
We present a thorough soft x-ray photoelectron spectroscopy (XPS) study of a mesoporous titanium dioxide electrode sensitized with the dye 4-(diphenylamino)phenylcyanoacrylic acid, referred to as "L0." Supported by calculations, the suite of XPS, x-ray absorption spectroscopy, and resonant photoelectron spectroscopy allows us to examine bonding interactions between the dye and the surface and the frontier electronic structure at the molecule-oxide interface. While placing these measurements in the context of existing literature, this paper is intended as a useful reference for further studies of more complex triphenylamine based sensitizers.
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Affiliation(s)
| | - Jack Hart
- School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
| | - Nektarios Verykokkos
- Energy Materials Laboratory, Chemistry, School of Natural and Environmental Science, Newcastle University, Newcastle upon Tyne NE1 7RU, United Kingdom
| | - Elizabeth Gibson
- Energy Materials Laboratory, Chemistry, School of Natural and Environmental Science, Newcastle University, Newcastle upon Tyne NE1 7RU, United Kingdom
| | - James N O'Shea
- School of Physics and Astronomy, University of Nottingham, University Park, Nottingham NG7 2RD, United Kingdom
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Deng K, Cole JM, Cooper JFK, Webster JRP, Haynes R, Al Bahri OK, Steinke NJ, Guan S, Stan L, Zhan X, Zhu T, Nye DW, Stenning GBG. Electrolyte/Dye/TiO 2 Interfacial Structures of Dye-Sensitized Solar Cells Revealed by In Situ Neutron Reflectometry with Contrast Matching. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2021; 37:1970-1982. [PMID: 33492974 DOI: 10.1021/acs.langmuir.0c03508] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
The nature of an interfacial structure buried within a device assembly is often critical to its function. For example, the dye/TiO2 interfacial structure that comprises the working electrode of a dye-sensitized solar cell (DSC) governs its photovoltaic output. These structures have been determined outside of the DSC device, using ex situ characterization methods; yet, they really should be probed while held within a DSC since they are modulated by the device environment. Dye/TiO2 structures will be particularly influenced by a layer of electrolyte ions that lies above the dye self-assembly. We show that electrolyte/dye/TiO2 interfacial structures can be resolved using in situ neutron reflectometry with contrast matching. We find that electrolyte constituents ingress into the self-assembled monolayer of dye molecules that anchor onto TiO2. Some dye/TiO2 anchoring configurations are modulated by the formation of electrolyte/dye intermolecular interactions. These electrolyte-influencing structural changes will affect dye-regeneration and electron-injection DSC operational processes. This underpins the importance of this in situ structural determination of electrolyte/dye/TiO2 interfaces within representative DSC device environments.
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Affiliation(s)
- Ke Deng
- Cavendish Laboratory, Department of Physics, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom
- Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0FA, United Kingdom
| | - Jacqueline M Cole
- Cavendish Laboratory, Department of Physics, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom
- Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0FA, United Kingdom
- ISIS Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0QX, United Kingdom
- Department of Chemical Engineering and Biotechnology, University of Cambridge, Philippa Fawcett Drive, Cambridge CB3 0AS, United Kingdom
- Argonne National Laboratory, 9700 South Cass Avenue, Lemont, Illinois 60439, United States
| | - Joshaniel F K Cooper
- ISIS Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0QX, United Kingdom
| | - John R P Webster
- ISIS Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0QX, United Kingdom
| | - Richard Haynes
- ISIS Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0QX, United Kingdom
| | - Othman K Al Bahri
- Cavendish Laboratory, Department of Physics, University of Cambridge, J. J. Thomson Avenue, Cambridge CB3 0HE, United Kingdom
- Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0FA, United Kingdom
| | - Nina-Juliane Steinke
- ISIS Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0QX, United Kingdom
| | - Shaoliang Guan
- Research Complex at Harwell, Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0FA, United Kingdom
- Cardiff Catalysis Institute, School of Chemistry, Cardiff University, Cardiff CF10 3AT, United Kingdom
| | - Liliana Stan
- Argonne National Laboratory, 9700 South Cass Avenue, Lemont, Illinois 60439, United States
| | - Xiaozhi Zhan
- Dongguan Neutron Science Center, Dongguan 523000, China
| | - Tao Zhu
- Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
- Songshan Lake Materials Laboratory, Dongguan, Guangdong 523808, China
| | - Daniel W Nye
- ISIS Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0QX, United Kingdom
| | - Gavin B G Stenning
- ISIS Neutron and Muon Source, STFC Rutherford Appleton Laboratory, Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0QX, United Kingdom
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Cherifi K, Cheknane A, S.Hilal H, Benghia A, Rahmoun K, Benyoucef B. Investigation of triphenylamine-based sensitizer characteristics and adsorption behavior onto ZnTiO3 perovskite (1 0 1) surfaces for dye-sensitized solar cells using first-principle calculation. Chem Phys 2020. [DOI: 10.1016/j.chemphys.2019.110595] [Citation(s) in RCA: 12] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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6
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Moradi M, Opara NL, Tulli LG, Wäckerlin C, Dalgarno SJ, Teat SJ, Baljozovic M, Popova O, van Genderen E, Kleibert A, Stahlberg H, Abrahams JP, Padeste C, Corvini PFX, Jung TA, Shahgaldian P. Supramolecular architectures of molecularly thin yet robust free-standing layers. SCIENCE ADVANCES 2019; 5:eaav4489. [PMID: 30801017 PMCID: PMC6386556 DOI: 10.1126/sciadv.aav4489] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 09/17/2018] [Accepted: 01/11/2019] [Indexed: 06/09/2023]
Abstract
Stable, single-nanometer thin, and free-standing two-dimensional layers with controlled molecular architectures are desired for several applications ranging from (opto-)electronic devices to nanoparticle and single-biomolecule characterization. It is, however, challenging to construct these stable single molecular layers via self-assembly, as the cohesion of those systems is ensured only by in-plane bonds. We herein demonstrate that relatively weak noncovalent bonds of limited directionality such as dipole-dipole (-CN⋅⋅⋅NC-) interactions act in a synergistic fashion to stabilize crystalline monomolecular layers of tetrafunctional calixarenes. The monolayers produced, demonstrated to be free-standing, display a well-defined atomic structure on the single-nanometer scale and are robust under a wide range of conditions including photon and electron radiation. This work opens up new avenues for the fabrication of robust, single-component, and free-standing layers via bottom-up self-assembly.
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Affiliation(s)
- Mina Moradi
- Institute of Chemistry and Bioanalytics, School of Life Sciences, University of Applied Sciences and Arts Northwestern Switzerland, Hofackerstrasse 35, CH-4132 Muttenz, Switzerland
- Laboratory for Micro- and Nano-technology, Paul Scherrer Institute, Villigen CH-5232, Switzerland
| | - Nadia L. Opara
- Laboratory for Micro- and Nano-technology, Paul Scherrer Institute, Villigen CH-5232, Switzerland
- Center for Cellular Imaging and NanoAnalytics (C-CINA), Biozentrum, University of Basel, Mattenstrasse 26, CH-4058 Basel, Switzerland
| | - Ludovico G. Tulli
- Institute of Chemistry and Bioanalytics, School of Life Sciences, University of Applied Sciences and Arts Northwestern Switzerland, Hofackerstrasse 35, CH-4132 Muttenz, Switzerland
| | - Christian Wäckerlin
- Empa–Swiss Federal Laboratories for Materials Science and Technology, CH-8600 Dübendorf, Switzerland
| | - Scott J. Dalgarno
- Institute of Chemical Sciences, Heriot-Watt University, Riccarton, Edinburgh, Scotland EH14 4AS, UK
| | - Simon J. Teat
- Advanced Light Source, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, MS6R2100, Berkeley, CA 94720, USA
| | - Milos Baljozovic
- Laboratory for Micro- and Nano-technology, Paul Scherrer Institute, Villigen CH-5232, Switzerland
| | - Olha Popova
- Department of Physics, University of Basel, Klingelbergstrasse 82, 4056 Basel, Switzerland
| | - Eric van Genderen
- Laboratory for Micro- and Nano-technology, Paul Scherrer Institute, Villigen CH-5232, Switzerland
| | - Armin Kleibert
- Swiss Light Source, Paul Scherrer Institute, CH-5232 Villigen, Switzerland
| | - Henning Stahlberg
- Center for Cellular Imaging and NanoAnalytics (C-CINA), Biozentrum, University of Basel, Mattenstrasse 26, CH-4058 Basel, Switzerland
| | - Jan Pieter Abrahams
- Biozentrum, University of Basel, Switzerland and Laboratory of Biomolecular Research, Paul Scherrer Institute, Villigen, Switzerland
- Institute of Biology Leiden, Leiden University, Sylviusweg 72, 2333 BE Leiden, Netherlands
| | - Celestino Padeste
- Laboratory for Micro- and Nano-technology, Paul Scherrer Institute, Villigen CH-5232, Switzerland
| | - Philippe F.-X. Corvini
- Institute of Chemistry and Bioanalytics, School of Life Sciences, University of Applied Sciences and Arts Northwestern Switzerland, Hofackerstrasse 35, CH-4132 Muttenz, Switzerland
| | - Thomas A. Jung
- Laboratory for Micro- and Nano-technology, Paul Scherrer Institute, Villigen CH-5232, Switzerland
| | - Patrick Shahgaldian
- Institute of Chemistry and Bioanalytics, School of Life Sciences, University of Applied Sciences and Arts Northwestern Switzerland, Hofackerstrasse 35, CH-4132 Muttenz, Switzerland
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7
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McCree-Grey J, Cole JM, Holt SA, Evans PJ, Gong Y. DyeTiO 2 interfacial structure of dye-sensitised solar cell working electrodes buried under a solution of I -/I 3- redox electrolyte. NANOSCALE 2017; 9:11793-11805. [PMID: 28786471 DOI: 10.1039/c7nr03936k] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Dye-sensitised solar cells (DSCs) have niche prospects for electricity-generating windows that could equip buildings for energy-sustainable future cities. However, this 'smart window' technology is being held back by a lack of understanding in how the dye interacts with its device environment at the molecular level. A better appreciation of the dyeTiO2 interfacial structure of the DSC working electrodes would be particularly valuable since associated structure-function relationships could be established; these rules would provide a 'toolkit' for the molecular engineering of more suitable DSC dyes via rational design. Previous materials characterisation efforts have been limited to determining this interfacial structure within an environment exposed to air or situated in a solvent medium. This study is the first to reveal the structure of this buried interface within the functional device environment, and represents the first application of in situ neutron reflectometry to DSC research. By incorporating the electrolyte into the structural model of this buried interface, we reveal how lithium cations from the electrolyte constituents influence the dyeTiO2 binding configuration of an organic sensitiser, MK-44, via Li+ complexation to the cyanoacrylate group. This dye is the molecular congener of the high-performance MK-2 DSC dye, whose hexa-alkyl chains appear to stabilise it from Li+ complexation. Our in situ neutron reflectometry findings are built up from auxiliary structural models derived from ex situ X-ray reflectometry and corroborated via density functional theory and UV/vis absorption spectroscopy. Significant differences between the in situ and ex situ dyeTiO2 interfacial structures are found, highlighting the need to characterise the molecular structure of DSC working electrodes while in a fully assembled device.
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Affiliation(s)
- Jonathan McCree-Grey
- Cavendish Laboratory, Department of Physics, University of Cambridge, J. J. Thomson Avenue, Cambridge, CB3 0HE, UK.
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8
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Cole JM, Blood-Forsythe MA, Lin TC, Pattison P, Gong Y, Vázquez-Mayagoitia Á, Waddell PG, Zhang L, Koumura N, Mori S. Discovery of S···C≡N Intramolecular Bonding in a Thiophenylcyanoacrylate-Based Dye: Realizing Charge Transfer Pathways and Dye···TiO 2 Anchoring Characteristics for Dye-Sensitized Solar Cells. ACS APPLIED MATERIALS & INTERFACES 2017; 9:25952-25961. [PMID: 28692246 DOI: 10.1021/acsami.7b03522] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Donor-π-acceptor dyes containing thiophenyl π-conjugated units and cyanoacrylate acceptor groups are among the best-performing organic chromophores used in dye-sensitized solar cell (DSC) applications. Yet, the molecular origins of their high photovoltaic output have remained unclear until now. This synchrotron-based X-ray diffraction study elucidates these origins for the high-performance thiophenylcyanoacrylate-based dye MK-2 (7.7% DSC device efficiency) and its molecular building block, MK-44. The crystal structures of MK-2 and MK-44 are both determined, while a high-resolution charge-density mapping of the smaller molecule was also possible, enabling the nature of its bonding to be detailed. A strong S···C≡N intramolecular interaction is discovered, which bears a bond critical point, thus proving that this interaction should be formally classified as a chemical bond. A topological analysis of the π-conjugated portion of MK-44 shows that this S···C≡N bonding underpins the highly efficient intramolecular charge transfer (ICT) in thiophenylcyanoacrylate dyes. This manifests as two bipartite ICT pathways bearing carboxylate and nitrile end points. In turn, these pathways dictate a preferred COO/CN anchoring mode for the dye as it adsorbs onto TiO2 surfaces, to form the dye···TiO2 interface that constitutes the DSC working electrode. These results corroborate a recent proposal that all cyanoacrylate groups anchor onto TiO2 in this COO/CN binding configuration. Conformational analysis of the MK-44 and MK-2 crystal structures reveals that this S···C≡N bonding will persist in MK-2. Accordingly, this newly discovered bond affords a rational explanation for the attractive photovoltaic properties of MK-2. More generally, this study provides the first unequivocal evidence for an S···C≡N interaction, confirming previous speculative assignments of such interactions in other compounds.
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Affiliation(s)
- Jacqueline M Cole
- Cavendish Laboratory, Department of Physics, University of Cambridge , J. J. Thomson Avenue, Cambridge, CB3 0HE, United Kingdom
- ISIS Neutron and Muon Source, STFC Rutherford Appleton Laboratory , Harwell Science and Innovation Campus, Didcot, Oxfordshire OX11 0QX, United Kingdom
- Argonne National Laboratory , 9700 S. Cass Avenue, Argonne, Illinois 60439, United States
- Department of Chemical Engineering and Biotechnology, University of Cambridge , West Cambridge Site, Philippa Fawcett Drive, Cambridge, CB3 0FS, United Kingdom
| | - Martin A Blood-Forsythe
- Cavendish Laboratory, Department of Physics, University of Cambridge , J. J. Thomson Avenue, Cambridge, CB3 0HE, United Kingdom
| | - Tze-Chia Lin
- Cavendish Laboratory, Department of Physics, University of Cambridge , J. J. Thomson Avenue, Cambridge, CB3 0HE, United Kingdom
| | - Philip Pattison
- Swiss Norwegian Beamlines, European Synchrotron Radiation Facility , F-38000 Grenoble, France
| | - Yun Gong
- Cavendish Laboratory, Department of Physics, University of Cambridge , J. J. Thomson Avenue, Cambridge, CB3 0HE, United Kingdom
| | | | - Paul G Waddell
- Cavendish Laboratory, Department of Physics, University of Cambridge , J. J. Thomson Avenue, Cambridge, CB3 0HE, United Kingdom
- Australian Centre for Neutron Scattering, Australian Nuclear Science and Technology Organisation, Lucas Heights NSW 2234, Australia
| | - Lei Zhang
- Cavendish Laboratory, Department of Physics, University of Cambridge , J. J. Thomson Avenue, Cambridge, CB3 0HE, United Kingdom
| | - Nagatoshi Koumura
- National Institute of Advanced Industrial Science and Technology , 1-1-1 Higashi, Tsukuba, Ibaraki 305-8565, Japan
| | - Shogo Mori
- Division of Chemistry and Materials, Shinshu University, Faculty of Textile Science and Technology , Ueda, Nagano 3868567, Japan
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Cole JM, Low KS, Gong Y. Discovery of Black Dye Crystal Structure Polymorphs: Implications for Dye Conformational Variation in Dye-Sensitized Solar Cells. ACS APPLIED MATERIALS & INTERFACES 2015; 7:27646-27653. [PMID: 26599130 DOI: 10.1021/acsami.5b07364] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/05/2023]
Abstract
We present the discovery of a new crystal structure polymorph (1) and pseudopolymorph (2) of the Black Dye, one of the world's leading dyes for dye-sensitized solar cells, DSSCs (10.4% device performance efficiency). This reveals that Black Dye molecules can adopt multiple low-energy conformers. This is significant since it challenges existing models of the Black Dye···TiO2 adsorption process that renders a DSSC working electrode; these have assumed a single molecular conformation that refers to the previously reported Black Dye crystal structure (3). The marked structural differences observed between 1, 2, and 3 make the need for modeling multiple conformations more acute. Additionally, the ordered form of the Black Dye (1) provides a more appropriate depiction of its anionic structure, especially regarding its anchoring group and NCS bonding descriptions. The tendency toward NCS ligand isomerism, evidenced via the disordered form 2, has consequences for electron injection and electron recombination in Black Dye embedded DSSC devices. Dyes 2 and 3 differ primarily by the absence or presence of a solvent of crystallization, respectively; solvent environment effects on the dye are thereby elucidated. This discovery of multiple Black Dye conformers from diffraction, with atomic-level definition, complements recently reported nanoscopic evidence for multiple dye conformations existing at a dye···TiO2 interface, for a chemically similar DSSC dye; those results emanated from imaging and spectroscopy, but were unresolved at the submolecular level. Taken together, these findings lead to the general notion that multiple dye conformations should be explicitly considered when modeling dye···TiO2 interfaces in DSSCs, at least for ruthenium-based dye complexes.
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Affiliation(s)
- Jacqueline M Cole
- Cavendish Laboratory, University of Cambridge , J. J. Thomson Avenue, Cambridge, CB3 0HE, United Kingdom
- Argonne National Laboratory , 9700 S Cass Avenue, Argonne, Illinois 60439, United States
| | - Kian Sing Low
- Cavendish Laboratory, University of Cambridge , J. J. Thomson Avenue, Cambridge, CB3 0HE, United Kingdom
| | - Yun Gong
- Cavendish Laboratory, University of Cambridge , J. J. Thomson Avenue, Cambridge, CB3 0HE, United Kingdom
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10
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Voïtchovsky K, Ashari-Astani N, Tavernelli I, Tétreault N, Rothlisberger U, Stellacci F, Grätzel M, Harms HA. In Situ Mapping of the Molecular Arrangement of Amphiphilic Dye Molecules at the TiO₂ Surface of Dye-Sensitized Solar Cells. ACS APPLIED MATERIALS & INTERFACES 2015; 7:10834-42. [PMID: 25936429 DOI: 10.1021/acsami.5b01638] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Amphiphilic sensitizers are central to the function of dye-sensitized solar cells. It is known that the cell's performance depends on the molecular arrangement and the density of the dye on the semiconductor surface, but a molecular-level picture of the cell-electrolyte interface is still lacking. Here, we present subnanometer in situ atomic force microscopy images of the Z907 dye at the surface of TiO2 in a relevant liquid. Our results reveal changes in the conformation and the lateral arrangement of the dye molecules, depending on their average packing density on the surface. Complementary quantitative measurements on the ensemble of the film are obtained by the quartz-crystal microbalance with dissipation technique. An atomistic picture of the dye coverage-dependent packing, the effectiveness of the hydrophobic alkyl chains as blocking layer, and the solvent accessibility is obtained from molecular dynamics simulations.
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Affiliation(s)
- Kislon Voïtchovsky
- †EPFL STI IMX SUNMIL, Station 12, CH-1015 Lausanne, Switzerland
- ‡Physics Department, Durham University, Durham DH1 3LE, United Kingdom
| | | | | | | | | | | | | | - Hauke A Harms
- ∥EPFL SB ISIC LPI, Station 6, CH-1015 Lausanne, Switzerland
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11
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Akbari A, Hashemi J, Niskanen J, Huotari S, Hakala M. Identification of the dye adsorption modes in dye-sensitised solar cells with X-ray spectroscopy techniques: a computational study. Phys Chem Chem Phys 2015; 17:10849-55. [DOI: 10.1039/c4cp05980h] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Abstract
X-ray photoelectron spectroscopy of O 1s is shown to be the most reliable technique in assessing adsorption geometry of dye molecules in a dye-sensitised solar cell.
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Affiliation(s)
- Ali Akbari
- Department of Physics
- University of Helsinki
- Helsinki
- Finland
| | - Javad Hashemi
- Department of Physics
- University of Helsinki
- Helsinki
- Finland
| | | | - Simo Huotari
- Department of Physics
- University of Helsinki
- Helsinki
- Finland
| | - Mikko Hakala
- Department of Physics
- University of Helsinki
- Helsinki
- Finland
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12
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Zhang W, Liu L, Wan L, Liu L, Cao L, Xu F, Zhao J, Wu Z. Electronic structures of bare and terephthalic acid adsorbed TiO2(110)-(1 × 2) reconstructed surfaces: origin and reactivity of the band gap states. Phys Chem Chem Phys 2015; 17:20144-53. [DOI: 10.1039/c5cp01298h] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
Abstract
Ti2O3-row contributed band gap states are sensitive to TPA adsorption, resulting in the redistribution of Ti 3d states at the interface.
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Affiliation(s)
- Wenhua Zhang
- National Synchrotron Radiation Laboratory
- University of Science and Technology of China
- Hefei 230029
- People's Republic of China
| | - Liming Liu
- Department of Physics and Hefei National Laboratory for Physical Sciences at the Microscale
- University of Science and Technology of China
- Hefei 230026
- People's Republic of China
| | - Li Wan
- National Synchrotron Radiation Laboratory
- University of Science and Technology of China
- Hefei 230029
- People's Republic of China
| | - Lingyun Liu
- National Synchrotron Radiation Laboratory
- University of Science and Technology of China
- Hefei 230029
- People's Republic of China
| | - Liang Cao
- High Magnetic Field Laboratory
- Chinese Academy of Sciences
- Hefei 230031
- P. R. China
| | - Faqiang Xu
- National Synchrotron Radiation Laboratory
- University of Science and Technology of China
- Hefei 230029
- People's Republic of China
| | - Jin Zhao
- Department of Physics and Hefei National Laboratory for Physical Sciences at the Microscale
- University of Science and Technology of China
- Hefei 230026
- People's Republic of China
- Synergetic Innovation Center of Quantum Information & Quantum Physics
| | - Ziyu Wu
- National Synchrotron Radiation Laboratory
- University of Science and Technology of China
- Hefei 230029
- People's Republic of China
- Beijing Synchrotron Radiation Laboratory
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13
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Zhang F, Ma W, Jiao Y, Wang J, Shan X, Li H, Lu X, Meng S. Precise identification and manipulation of adsorption geometry of donor-π-acceptor dye on nanocrystalline TiO₂ films for improved photovoltaics. ACS APPLIED MATERIALS & INTERFACES 2014; 6:22359-69. [PMID: 25418522 DOI: 10.1021/am506365a] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
Adsorption geometry of dye molecules on nanocrystalline TiO2 plays a central role in dye-sensitized solar cells, enabling effective sunlight absorption, fast electron injection, optimized interface band offsets, and stable photovoltaic performance. However, precise determination of dye binding geometry and proportion has been challenging due to complexity and sensitivity at interfaces. Here employing combined vibrational spectrometry and density functional calculations, we identify typical adsorption configurations of widely adopted cyanoacrylic donor-π bridge-acceptor dyes on nanocrystalline TiO2. Binding mode switching from bidentate bridging to hydrogen-bonded monodentate configuration with Ti-N bonding has been observed when dye-sensitizing solution becomes more basic. Raman and infrared spectroscopy measurements confirm this configuration switch and determine quantitatively the proportion of competing binding geometries, with vibration peaks assigned using density functional theory calculations. We further found that the proportion of dye-binding configurations can be manipulated by adjusting pH value of dye-sensitizing solutions. Controlling molecular adsorption density and configurations led to enhanced energy conversion efficiency from 2.4% to 6.1% for the fabricated dye-sensitized solar cells, providing a simple method to improve photovoltaic performance by suppressing unfavorable binding configurations in solar cell applications.
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Affiliation(s)
- Fan Zhang
- Beijing National Laboratory for Condensed Matter Physics, and Institute of Physics, Chinese Academy of Sciences , Beijing, 100190, P. R. China
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14
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Cao L, Gao XY, Wee ATS, Qi DC. Quantitative femtosecond charge transfer dynamics at organic/electrode interfaces studied by core-hole clock spectroscopy. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2014; 26:7880-7888. [PMID: 24692009 DOI: 10.1002/adma.201305414] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/31/2013] [Revised: 02/28/2014] [Indexed: 06/03/2023]
Abstract
Organic semiconductor materials have important applications in organic electronics and other novel hybrid devices. In these devices, the transport of charge carriers across the interfaces between organic molecules and electrodes plays an important role in determining the device performance. Charge transfer dynamics at the organic/electrode interface usually occurs at the several femtoseconds timescale, and quantitative charge transfer dynamics data can been inferred using synchrotron-based core-hole clock (CHC) spectroscopy. In this research news, we have reviewed recent progress in the applications of CHC spectroscopy on the quantitative characterization of charge transfer dynamics at organic/electrode interfaces. By examining charge transfer dynamics at different types of interface, from weakly interacting van der Waals-type interfaces to interfaces with strong covalent bonds, we discuss a few factors that have been found to affect the charge transfer dynamics. We also review the application of CHC spectroscopy to quantify through-bonds and through-space charge transport in organic molecules.
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Affiliation(s)
- Liang Cao
- Department of Physics, National University of Singapore, 2 Science Drive 3, Singapore, 117542, Singapore, Department of Chemistry, National University of Singapore, 3 Science Drive 3, Singapore, 117543, Singapore
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15
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Pang CL, Lindsay R, Thornton G. Structure of clean and adsorbate-covered single-crystal rutile TiO2 surfaces. Chem Rev 2013; 113:3887-948. [PMID: 23676004 DOI: 10.1021/cr300409r] [Citation(s) in RCA: 264] [Impact Index Per Article: 24.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Affiliation(s)
- Chi Lun Pang
- London Centre for Nanotechnology and Department of Chemistry, University College London, London WC1H 0AJ, United Kingdom
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16
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Akimov AV, Neukirch AJ, Prezhdo OV. Theoretical Insights into Photoinduced Charge Transfer and Catalysis at Oxide Interfaces. Chem Rev 2013; 113:4496-565. [DOI: 10.1021/cr3004899] [Citation(s) in RCA: 402] [Impact Index Per Article: 36.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Affiliation(s)
- Alexey V. Akimov
- Department of Chemistry, University of Rochester, Rochester, New York 14627,
United States
- Chemistry
Department, Brookhaven National Laboratory, Upton, New York 11973-5000,
United States
| | - Amanda J. Neukirch
- Department
of Physics and Astronomy, University of Rochester, Rochester, New York 14627,
United States
| | - Oleg V. Prezhdo
- Department of Chemistry, University of Rochester, Rochester, New York 14627,
United States
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17
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Yu S, Ahmadi S, Sun C, Adibi PTZ, Chow W, Pietzsch A, Göthelid M. Inhomogeneous charge transfer within monolayer zinc phthalocyanine absorbed on TiO2(110). J Chem Phys 2012; 136:154703. [DOI: 10.1063/1.3699072] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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18
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Hao Y, Yang X, Cong J, Jiang X, Hagfeldt A, Sun L. Photo-induced electron transfer study of D-π-A sensitizers with different type of anchoring groups for dye-sensitized solar cells. RSC Adv 2012. [DOI: 10.1039/c2ra20436c] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
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19
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Cao L, Wang YZ, Chen TX, Zhang WH, Yu XJ, Ibrahim K, Wang JO, Qian HJ, Xu FQ, Qi DC, Wee ATS. Charge transfer dynamics of 3,4,9,10-perylene-tetracarboxylic-dianhydride molecules on Au(111) probed by resonant photoemission spectroscopy. J Chem Phys 2011; 135:174701. [DOI: 10.1063/1.3656834] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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