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Chen J, Liu Y, Chen F, Guo M, Zhou J, Fu P, Zhang X, Wang X, Wang H, Hua W, Chen J, Hu J, Mao Y, Jin D, Bu W. Non-Faradaic optoelectrodes for safe electrical neuromodulation. Nat Commun 2024; 15:405. [PMID: 38195782 PMCID: PMC10776784 DOI: 10.1038/s41467-023-44635-8] [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] [Received: 09/07/2023] [Accepted: 12/20/2023] [Indexed: 01/11/2024] Open
Abstract
Nanoscale optoelectrodes hold the potential to stimulate optically individual neurons and intracellular organelles, a challenge that demands both a high-density of photoelectron storage and significant charge injection. Here, we report that zinc porphyrin, commonly used in dye-sensitized solar cells, can be self-assembled into nanorods and then coated by TiO2. The J-aggregated zinc porphyrin array enables long-range exciton diffusion and allows for fast electron transfer into TiO2. The formation of TiO2(e-) attracts positive charges around the neuron membrane, contributing to the induction of action potentials. Far-field cranial irradiation of the motor cortex using a 670 nm laser or an 850 nm femtosecond laser can modulate local neuronal firing and trigger motor responses in the hind limb of mice. The pulsed photoelectrical stimulation of neurons in the subthalamic nucleus alleviates parkinsonian symptoms in mice, improving abnormal stepping and enhancing the activity of dopaminergic neurons. Our results suggest injectable nanoscopic optoelectrodes for optical neuromodulation with high efficiency and negligible side effects.
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Affiliation(s)
- Jian Chen
- Department of Materials Science, State Key Laboratory of Molecular Engineering of Polymers, Fudan University, Shanghai, 200433, China
| | - Yanyan Liu
- Department of Materials Science, State Key Laboratory of Molecular Engineering of Polymers, Fudan University, Shanghai, 200433, China
- Department of Neurosurgery, Huashan Hospital, Fudan University, Shanghai, 200041, China
| | - Feixiang Chen
- Department of Materials Science, State Key Laboratory of Molecular Engineering of Polymers, Fudan University, Shanghai, 200433, China
| | - Mengnan Guo
- Department of Materials Science, State Key Laboratory of Molecular Engineering of Polymers, Fudan University, Shanghai, 200433, China
| | - Jiajia Zhou
- Institute for Biomedical Materials and Devices (IBMD), Faculty of Science, University of Technology Sydney, Sydney, New South Wales, 2007, Australia
| | - Pengfei Fu
- Department of Neurosurgery, Huashan Hospital, Fudan University, Shanghai, 200041, China
| | - Xin Zhang
- Department of Neurosurgery, Huashan Hospital, Fudan University, Shanghai, 200041, China
| | - Xueli Wang
- Sate Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai, 200062, China
| | - He Wang
- Institute of Science and Technology for Brain Inspired Intelligence, Fudan University, Shanghai, 200433, China
| | - Wei Hua
- Department of Neurosurgery, Huashan Hospital, Fudan University, Shanghai, 200041, China
| | - Jinquan Chen
- Sate Key Laboratory of Precision Spectroscopy, East China Normal University, Shanghai, 200062, China
| | - Jin Hu
- Department of Neurosurgery, Huashan Hospital, Fudan University, Shanghai, 200041, China
| | - Ying Mao
- Department of Neurosurgery, Huashan Hospital, Fudan University, Shanghai, 200041, China.
| | - Dayong Jin
- Institute for Biomedical Materials and Devices (IBMD), Faculty of Science, University of Technology Sydney, Sydney, New South Wales, 2007, Australia.
- Eastern Institute for Advanced Study, Eastern Institute of Technology, Ningbo, Zhejiang, 315200, P.R. China.
| | - Wenbo Bu
- Department of Materials Science, State Key Laboratory of Molecular Engineering of Polymers, Fudan University, Shanghai, 200433, China.
- Department of Neurosurgery, Huashan Hospital, Fudan University, Shanghai, 200041, China.
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2
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Ye C, Cheng H, Wrede S, Diring S, Tian H, Odobel F, Hammarström L. Charge Recombination Deceleration by Lateral Transfer of Electrons in Dye-Sensitized NiO Photocathode. J Am Chem Soc 2023; 145:11067-11073. [PMID: 37191461 DOI: 10.1021/jacs.3c00269] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
Control of charge separation and recombination is critical for dye-sensitized solar cells and photoelectrochemical cells, and for p-type cells, the latter process limits their photovoltaic performance. We speculated that the lateral electron hopping between dyes on a p-type semiconductor surface can effectively separate electrons and holes in space and retard recombination. Thus, device designs where lateral electron hopping is promoted can lead to enhanced cell performance. Herein, we present an indirect proof by involving a second dye to monitor the effect of electron hopping after hole injection into the semiconductor. In mesoporous NiO films sensitized with peryleneimide (PMI) or naphthalene diimide (NDI) dyes, dye excitation led to ultrafast hole injection into NiO from either excited PMI* (τ < 200 fs) or NDI* (τ = 1.2 ps). In cosensitized films, surface electron transfer from PMI- to NDI was rapid (τ = 24 ps). Interestingly, the subsequent charge recombination (ps-μs) with NiO holes was much slower when NDI- was generated by electron transfer from PMI- than when NDI was excited directly. We therefore indicate that the charge recombination is slowed down after the charge hopping from the original PMI sites to the NDI sites. The experimental results supported our hypothesis and revealed important information on the charge carrier kinetics for the dye-sensitized NiO photoelectrode system.
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Affiliation(s)
- Chen Ye
- Department of Chemistry-Ångström Laboratories, Uppsala University, Uppsala SE75120, Sweden
| | - Haoliang Cheng
- Department of Chemistry-Ångström Laboratories, Uppsala University, Uppsala SE75120, Sweden
| | - Sina Wrede
- Department of Chemistry-Ångström Laboratories, Uppsala University, Uppsala SE75120, Sweden
| | - Stéphane Diring
- CNRS, CEISAM UMR 6230, Université de Nantes, F-44000 Nantes, France
| | - Haining Tian
- Department of Chemistry-Ångström Laboratories, Uppsala University, Uppsala SE75120, Sweden
| | - Fabrice Odobel
- CNRS, CEISAM UMR 6230, Université de Nantes, F-44000 Nantes, France
| | - Leif Hammarström
- Department of Chemistry-Ångström Laboratories, Uppsala University, Uppsala SE75120, Sweden
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3
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Yasuji K, Sakanoue T, Yonekawa F, Kanemoto K. Visualizing electroluminescence process in light-emitting electrochemical cells. Nat Commun 2023; 14:992. [PMID: 36859421 PMCID: PMC9977921 DOI: 10.1038/s41467-023-36472-6] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2022] [Accepted: 02/02/2023] [Indexed: 03/03/2023] Open
Abstract
Electroluminescence occurs via recombination reactions between electrons and holes, but these processes have not been directly evaluated. Here, we explore the operation dynamics of ionic liquid-based light-emitting electrochemical cells (LECs) with stable electroluminescence by multi-timescale spectroscopic measurements synchronized with the device operation. Bias-modulation spectroscopy, measuring spectral responses to modulated biases, reveals the bias-dependent behavior of p-doped layers varying from growth to saturation and to recession. The operation dynamics of the LEC is directly visualized by time-resolved bias-modulation spectra, revealing the following findings. Electron injection occurs more slowly than hole injection, causing delay of electroluminescence with respect to the p-doping. N-doping proceeds as the well-grown p-doped layer recedes, which occur while the electroluminescence intensity remains constant. With the growth of n-doped layer, hole injection is reduced due to charge balance, leading to hole-accumulation on the anode, after which LEC operation reaches equilibrium. These spectroscopic techniques are widely applicable to explore the dynamics of electroluminescence-devices.
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Affiliation(s)
- Kosuke Yasuji
- Department of Physics, Graduate School of Science, Osaka Metropolitan University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka, 558-8585 Japan
| | - Tomo Sakanoue
- grid.480288.e0000 0004 1761 6725Nippon Chemical Industrial Co., Ltd., 9-11-1 Kameido, Koto, Tokyo, 136-8515 Japan
| | - Fumihiro Yonekawa
- grid.480288.e0000 0004 1761 6725Nippon Chemical Industrial Co., Ltd., 9-11-1 Kameido, Koto, Tokyo, 136-8515 Japan
| | - Katsuichi Kanemoto
- Department of Physics, Graduate School of Science, Osaka Metropolitan University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka, 558-8585, Japan. .,Nambu Yoichiro Institute of Theoretical and Experimental Physics (NITEP), Osaka Metropolitan University, 3-3-138 Sugimoto, Sumiyoshi-ku, Osaka, 558-8585, Japan.
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4
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Heidari M, Loague Q, Bangle RE, Galoppini E, Meyer GJ. Reorganization Energies for Interfacial Electron Transfer across Phenylene Ethynylene Rigid-Rod Bridges. ACS APPLIED MATERIALS & INTERFACES 2022; 14:35205-35214. [PMID: 35862637 DOI: 10.1021/acsami.2c07151] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/15/2023]
Abstract
A family of three ruthenium bipyridyl rigid-rod compounds of the general form [Ru(bpy)2(LL)](PF6)2 were anchored to mesoporous thin films of tin-doped indium oxide (ITO) nanocrystals. Here, LL is a 4-substituted 2,2-bipyridine (bpy) ligand with varying numbers of conjugated phenylenethynylene bridge units between the bipyridine ring and anchoring group consisting of a bis-carboxylated isophthalic group. The visible absorption spectra and the formal potentials, Eo(RuIII/II), of the surface anchored rigid-rods were insensitive to the presence of the phenylene ethynylene bridge units in 0.1 M tetrabutyl ammonium perchlorate acetonitrile solutions (TBAClO4/CH3CN). The conductive nature of the ITO enabled potentiostatic control of the Fermi level and hence a means to tune the Gibbs free energy change, -ΔG°, for electron transfer from the ITO to the rigid-rods. Pseudo-rate constants for this electron transfer reaction increased as the number of bridge units decreased at a fixed -ΔG°. With the assumption that the reorganization energy, λ, and the electronic coupling matrix element, Hab, were independent of the applied potential, rate constants measured as a function of -ΔG° and analyzed through Marcus-Gerischer theory provided estimates of Hab and λ. In rough accordance with the dielectric continuum theory, λ was found to increase from 0.61 to 0.80 eV as the number of bridge units was increased. In contrast, Hab decreased markedly with distance from 0.54 to 0.11 cm-1, consistent with non-adiabatic electron transfer. Comparative analysis with previously published studies of bridges with an sp3-hybridized carbon indicated that the phenylene ethynylene bridge does not enhance electronic coupling between the oxide and the rigid-rod acceptor. The implications of these findings for practical applications in solar energy conversion are specifically discussed.
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Affiliation(s)
- Marzieh Heidari
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Quentin Loague
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Rachel E Bangle
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Elena Galoppini
- Department of Chemistry, Rutgers University, 73 Warren Street, Newark, New Jersey 07102, United States
| | - Gerald J Meyer
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
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5
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Marri AR, Marchini E, Cabanes VD, Argazzi R, Pastore M, Caramori S, Bignozzi CA, Gros PC. A Series of Iron(II)-NHC Sensitizers with Remarkable Power Conversion Efficiency in Photoelectrochemical Cells*. Chemistry 2021; 27:16260-16269. [PMID: 34528728 DOI: 10.1002/chem.202103178] [Citation(s) in RCA: 11] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2021] [Indexed: 11/10/2022]
Abstract
A series of six new Fe(II)NHC-carboxylic sensitizers with their ancillary ligand decorated with functions of varied electronic properties have been designed with the aim to increase the metal-to- surface charge separation and light harvesting in iron-based dye-sensitized solar cells (DSSCs). ARM130 scored the highest efficiency ever reported for an iron-sensitized solar cell (1.83 %) using Mg2+ and NBu4 I-based electrolyte and a thick 20 μm TiO2 anode. Computational modelling, transient absorption spectroscopy and electrochemical impedance spectroscopy (EIS) revealed that the electronic properties induced by the dimethoxyphenyl-substituted NHC ligand of ARM130 led to the best combination of electron injection yield and spectral sensitivity breadth.
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Affiliation(s)
| | - Edoardo Marchini
- Department of Chemical, Pharmaceutical and Agricultural Sciences, University of Ferrara, Via L.Borsari 46, 44121, Ferrara, Italy
| | | | - Roberto Argazzi
- CNR-ISOF c/o Department of Chemical, Pharmaceutical and Agricultural Sciences, University of Ferrara, Via L.Borsari 46, 44121, Ferrara, Italy
| | | | - Stefano Caramori
- Department of Chemical, Pharmaceutical and Agricultural Sciences, University of Ferrara, Via L.Borsari 46, 44121, Ferrara, Italy
| | - Carlo Alberto Bignozzi
- Department of Chemical, Pharmaceutical and Agricultural Sciences, University of Ferrara, Via L.Borsari 46, 44121, Ferrara, Italy
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6
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Nandi R, Jain V, Devi M, Gupta T, Pal SK. Hydrogen bond assisted anchoring transitions in nematic liquid crystals at the aqueous interface. Colloids Surf A Physicochem Eng Asp 2021. [DOI: 10.1016/j.colsurfa.2021.126952] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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7
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Doost HA, Ghasedi A, Koushki E. Electrical effects of AuNPs and PVA polymers on optical band gap and thermo-optical properties of TiO2 nanoparticles. J Mol Liq 2021. [DOI: 10.1016/j.molliq.2020.115074] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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8
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Mogensen J, Michaels H, Roy R, Broløs L, Kilde MD, Freitag M, Nielsen MB. Indenofluorene‐Extended Tetrathiafulvalene Scaffolds for Dye‐Sensitized Solar Cells. European J Org Chem 2020. [DOI: 10.1002/ejoc.202001058] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Affiliation(s)
- Josefine Mogensen
- Department of Chemistry University of Copenhagen Universitetsparken 5 2100 Copenhagen Ø Denmark
| | - Hannes Michaels
- Department of Chemistry – Ångström Laboratory Uppsala University P.O. Box 523 75120 Uppsala Sweden
| | - Rajarshi Roy
- Department of Chemistry – Ångström Laboratory Uppsala University P.O. Box 523 75120 Uppsala Sweden
| | - Line Broløs
- Department of Chemistry University of Copenhagen Universitetsparken 5 2100 Copenhagen Ø Denmark
| | - Martin Drøhse Kilde
- Department of Chemistry University of Copenhagen Universitetsparken 5 2100 Copenhagen Ø Denmark
| | - Marina Freitag
- Department of Chemistry – Ångström Laboratory Uppsala University P.O. Box 523 75120 Uppsala Sweden
- School of Natural and Environmental Science, Bedson Building Newcastle University NE1 7RY Newcastle upon Tyne UK
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9
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Hu K, Sampaio RN, Schneider J, Troian-Gautier L, Meyer GJ. Perspectives on Dye Sensitization of Nanocrystalline Mesoporous Thin Films. J Am Chem Soc 2020; 142:16099-16116. [DOI: 10.1021/jacs.0c04886] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
Affiliation(s)
- Ke Hu
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
| | - Renato N. Sampaio
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
| | - Jenny Schneider
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
| | - Ludovic Troian-Gautier
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
| | - Gerald J. Meyer
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599-3290, United States
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10
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Harmer R, Fan H, Lloyd K, Doble S, Avenoso J, Yan H, Rego LGC, Gundlach L, Galoppini E. Synthesis and Properties of Perylene-Bridge-Anchor Chromophoric Compounds. J Phys Chem A 2020; 124:6330-6343. [PMID: 32654486 DOI: 10.1021/acs.jpca.0c04609] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The quest to control chromophore/semiconductor properties to enable new technologies in energy and information science requires detailed understanding of charge carrier dynamics at the atomistic level, which can often be attained through the use of model systems. Perylene-bridge-anchor compounds are successful models for studying fundamental charge transfer processes on TiO2, which remains among the most commonly investigated and technologically important interfaces, mostly because of perylene's advantageous electronic and optical properties. Nonetheless, the ability to fully exploit synthetically the substitution pattern of perylene with linker (= bridge-anchor) units remains little explored. Here we developed 2,5-di-tert-butylperylene (DtBuPe)-bridge-anchor compounds with t-Bu group substituents to prevent π-stacking and one or two linker units in both the peri and ortho positions, by employing a combination of Friedel-Crafts alkylations, bromination, iridium-catalyzed borylation, and palladium-catalyzed cross-coupling reactions. Photophysical characterization and computational analysis by density functional theory (DFT) and time-dependent DFT (TD-DFT) were carried out on four DtBuPe acrylic acid derivatives with a single or a double linker in peri (12b), ortho (15b), peri,peri (18b), and ortho,ortho (21b). The energies of the unoccupied orbitals {LUMO, LUMO + 1, LUMO + 2} are strongly affected by the presence of a π-conjugated linker, resulting in a stabilization of these states and a red shift of their absorption and emission spectra, as well as the loss of vibronic structure in the spectrum of the peri,peri compound, consistent with the strong bonding character of this substitution pattern.
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Affiliation(s)
- Ryan Harmer
- Department of Chemistry, Rutgers University, Newark, New Jersey 07102, United States
| | - Hao Fan
- Department of Chemistry, Rutgers University, Newark, New Jersey 07102, United States
| | - Katherine Lloyd
- Department of Chemistry, Rutgers University, Newark, New Jersey 07102, United States
| | - Samantha Doble
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
| | - Joseph Avenoso
- Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716, United States
| | - Han Yan
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States
| | - Luis G C Rego
- Department of Physics, Universidade Federal de Santa Catarina (UFSC), Florianopolis, South Carolina 88040-900, Brazil
| | - Lars Gundlach
- Department of Chemistry and Biochemistry, University of Delaware, Newark, Delaware 19716, United States.,Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716, United States
| | - Elena Galoppini
- Department of Chemistry, Rutgers University, Newark, New Jersey 07102, United States
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11
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DiMarco BN, Sampaio RN, James EM, Barr TJ, Bennett MT, Meyer GJ. Efficiency Considerations for SnO 2-Based Dye-Sensitized Solar Cells. ACS APPLIED MATERIALS & INTERFACES 2020; 12:23923-23930. [PMID: 32356647 DOI: 10.1021/acsami.0c04117] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/11/2023]
Abstract
A comparative study of mesoporous thin films based on SnO2 (rutile) and TiO2 (anatase) nanocrystallites sensitized to visible light with [Ru(dtb)2(dcb)](PF6)2, where dtb = 4,4'-(tert-butyl)2-2,2'-bipyridine and dcb = 4,4'-(CO2H)2-2,2'-bipyridine, in CH3CN electrolyte solutions is reported to identify the reason(s) for the low efficiency of SnO2-based dye-sensitized solar cells (DSSCs). Pulsed laser excitation resulted in rapid excited state injection (kinj > 108 s-1) followed by sensitizer regeneration through iodide oxidation to yield an interfacial charge separated state abbreviated as MO2(e-)|Ru + I3-. Spectral features associated with I3- and the injected electron MO2(e-) were observed as well as a hypsochromic shift of the metal-to-ligand charge-transfer absorption of the sensitizer attributed to an electric field. The field magnitude ranged from 0.008 to 0.39 MV/cm and was dependent on the electrolyte cation (Mg2+ or Li+) as well as the oxide material. Average MO2(e-) + I3- → recombination rate constants quantified spectroscopically were about 25 times smaller for SnO2 (6.0 ± 0.14 s-1) than for TiO2 (160 ± 10 s-1). Transient photovoltage measurements of operational DSSCs indicated a 78 ms lifetime for electrons injected into SnO2 compared to 27 ms for TiO2; behavior that is at odds with the view that recombination with I3- underlies the low efficiencies of nanocrystalline SnO2-based DSSCs. In contrast, the average rate constant for charge recombination with the oxidized sensitizer, MO2(e-)|-S+ → MO2|-S, was about 2 orders of magnitude larger for SnO2 (k = 9.8 × 104 s-1) than for TiO2 (k = 1.6 × 103 s-1). Sensitizer regeneration through iodide oxidation were similar for both oxide materials (kreg = 6 ± 1 × 1010 M-1 s-1). The data indicate that enhanced efficiency from SnO2-based DSSCs can be achieved by identifying alternative redox mediators that enable rapid sensitizer regeneration and by inhibiting recombination of the injected electron with the oxidized sensitizer.
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Affiliation(s)
- Brian N DiMarco
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Renato N Sampaio
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Erica M James
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Timothy J Barr
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Marc T Bennett
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Gerald J Meyer
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
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12
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Maurer AB, Meyer GJ. Stark Spectroscopic Evidence that a Spin Change Accompanies Light Absorption in Transition Metal Polypyridyl Complexes. J Am Chem Soc 2020; 142:6847-6851. [DOI: 10.1021/jacs.9b13602] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Andrew B. Maurer
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Gerald J. Meyer
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
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13
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Marchini E, Darari M, Lazzarin L, Boaretto R, Argazzi R, Bignozzi CA, Gros PC, Caramori S. Recombination and regeneration dynamics in FeNHC(ii)-sensitized solar cells. Chem Commun (Camb) 2019; 56:543-546. [PMID: 31829327 DOI: 10.1039/c9cc07794d] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
Recombination and regeneration dynamics in Fe-NHC-sensitized DSSCs revealed incomplete injection and the detrimental effect of photoinjected electron recapture by the I3-form of the redox electrolyte on performance. Importantly, the use of additives in the electrolyte allowed the best efficiency ever recorded for an iron-based DSSC to be reached.
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Affiliation(s)
- Edoardo Marchini
- Department of Chemical and Pharmaceutical Sciences, University of Ferrara, Via L.Borsari 46, 44121, Ferrara, Italy.
| | - Mohamed Darari
- Université de Lorraine, CNRS, L2CM, F-54000 Nancy, France
| | - Luca Lazzarin
- Department of Chemical and Pharmaceutical Sciences, University of Ferrara, Via L.Borsari 46, 44121, Ferrara, Italy.
| | - Rita Boaretto
- Department of Chemical and Pharmaceutical Sciences, University of Ferrara, Via L.Borsari 46, 44121, Ferrara, Italy.
| | - Roberto Argazzi
- CNR-ISOF c/o Department of Chemical and Pharmaceutical Sciences, University of Ferrara, Via L.Borsari 46, 44121, Ferrara, Italy
| | - Carlo Alberto Bignozzi
- Department of Chemical and Pharmaceutical Sciences, University of Ferrara, Via L.Borsari 46, 44121, Ferrara, Italy.
| | | | - Stefano Caramori
- Department of Chemical and Pharmaceutical Sciences, University of Ferrara, Via L.Borsari 46, 44121, Ferrara, Italy.
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14
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Sampaio RN, Li G, Meyer GJ. Flipping Molecules over on TiO 2 Surfaces with Light and Electric Fields. J Am Chem Soc 2019; 141:13898-13904. [PMID: 31364845 DOI: 10.1021/jacs.9b06687] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Light excitation of the sensitizer [Ru(NH3)5(eina)](PF6)2, where eina is ethyl isonicotinate, anchored to anatase TiO2 nanocrystallites interconnected in a mesoporous thin film and immersed in CH3CN resulted in spectroscopic changes consistent with both excited-state injection and sensitizer reorientation, termed flipping. When the light irradiation was removed, the sensitizers flipped back over. Such flipping was absent when the carboxylic acid derivative of the sensitizer was utilized or when SnO2/TiO2 core/shell materials were employed in place of TiO2. The flipping was attributed to the torque on the sensitizer in the electric field generated by the injected electrons. Pulsed light excitation was utilized to time-resolve flipping and charge recombination with this and the per-deuterated complex (ND3)5RuII(eina)|TiO2. In all cases, charge recombination was more rapid when the oxidized sensitizer was flipped over, behavior consistent with stronger electronic coupling. Kinetic isotope effects of 26.7 and 0.12 were determined for charge recombination and for flipping, respectively. Spectro-electrochemical measurements showed that thermal reduction of TiO2 with an applied potential also initiated flipping yet required much larger field strengths. The data show that the electric fields created at illuminated semiconductor interfaces are sufficient to reorientate molecules anchored to its surface.
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Affiliation(s)
- Renato N Sampaio
- Department of Chemistry , The University of North Carolina at Chapel Hill , Murray Hall 2202B , Chapel Hill , North Carolina 27599-3290 , United States
| | - Guocan Li
- Department of Chemistry , The University of North Carolina at Chapel Hill , Murray Hall 2202B , Chapel Hill , North Carolina 27599-3290 , United States
| | - Gerald J Meyer
- Department of Chemistry , The University of North Carolina at Chapel Hill , Murray Hall 2202B , Chapel Hill , North Carolina 27599-3290 , United States
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15
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Carreño A, Páez-Hernández D, Zúñiga C, Ramírez-Osorio A, Nevermann J, Rivera-Zaldívar MM, Otero C, Fuentes JA. Prototypical cis-ruthenium(II) complexes present differential fluorescent staining in walled-cell models (yeasts). CHEMICAL PAPERS 2019. [DOI: 10.1007/s11696-019-00714-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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16
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Lennert A, Guldi DM. Homoleptic and Heteroleptic Copper Complexes as Redox Couples in Dye‐Sensitized Solar Cells. CHEMPHOTOCHEM 2019. [DOI: 10.1002/cptc.201900104] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Annkatrin Lennert
- Friedrich-Alexander-Universität Erlangen-NürnbergDepartment of Chemistry and Pharmacy and Interdisciplinary Center for Molecular Materials (ICMM) Egerlandstrasse 3 91058 Erlangen Germany
| | - Dirk M. Guldi
- Friedrich-Alexander-Universität Erlangen-NürnbergDepartment of Chemistry and Pharmacy and Interdisciplinary Center for Molecular Materials (ICMM) Egerlandstrasse 3 91058 Erlangen Germany
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17
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Schäfgen B, Khelwati H, Bechtel DF, DeCuyper A, Schüssler A, Neuba A, Pierik AJ, Ernst S, Müller TJJ, Thiel WR. Phenothiazine electrophores immobilized on periodic mesoporous organosilicas by ion exchange. NEW J CHEM 2019. [DOI: 10.1039/c9nj04661e] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/13/2023]
Abstract
Two different phenothiazines carrying quaternary ammonium groups in the side chain have been synthesized and fully characterized.
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Affiliation(s)
- Björn Schäfgen
- Fachbereich Chemie
- Technische Universität Kaiserslautern
- D-67663 Kaiserslautern
- Germany
| | - Hilla Khelwati
- Institut für Organische Chemie und Makromolekulare Chemie
- Heinrich-Heine-Universität Düsseldorf
- D-40225 Düsseldorf
- Germany
| | - Dominique F. Bechtel
- Fachbereich Chemie
- Technische Universität Kaiserslautern
- D-67663 Kaiserslautern
- Germany
| | - Annelies DeCuyper
- Fachbereich Chemie
- Technische Universität Kaiserslautern
- D-67663 Kaiserslautern
- Germany
| | - Axel Schüssler
- Fachbereich Chemie
- Technische Universität Kaiserslautern
- D-67663 Kaiserslautern
- Germany
| | - Adam Neuba
- Department Chemie
- Universität Paderborn
- D-33098 Paderborn
- Germany
| | - Antonio J. Pierik
- Fachbereich Chemie
- Technische Universität Kaiserslautern
- D-67663 Kaiserslautern
- Germany
| | - Stefan Ernst
- Fachbereich Chemie
- Technische Universität Kaiserslautern
- D-67663 Kaiserslautern
- Germany
| | - Thomas J. J. Müller
- Institut für Organische Chemie und Makromolekulare Chemie
- Heinrich-Heine-Universität Düsseldorf
- D-40225 Düsseldorf
- Germany
| | - Werner R. Thiel
- Fachbereich Chemie
- Technische Universität Kaiserslautern
- D-67663 Kaiserslautern
- Germany
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18
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Clark ML, Ge A, Videla PE, Rudshteyn B, Miller CJ, Song J, Batista VS, Lian T, Kubiak CP. CO2 Reduction Catalysts on Gold Electrode Surfaces Influenced by Large Electric Fields. J Am Chem Soc 2018; 140:17643-17655. [DOI: 10.1021/jacs.8b09852] [Citation(s) in RCA: 67] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
Affiliation(s)
- Melissa L. Clark
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, MC 0358, La Jolla, California 92093, United States
| | - Aimin Ge
- Department of Chemistry, Emory University, 1515 Dickey Drive, Northeast, Atlanta, Georgia 30322, United States
| | - Pablo E. Videla
- Department of Chemistry and Energy Sciences Institute, Yale University, 225 Prospect Street, New Haven, Connecticut 06520, United States
| | - Benjamin Rudshteyn
- Department of Chemistry and Energy Sciences Institute, Yale University, 225 Prospect Street, New Haven, Connecticut 06520, United States
| | - Christopher J. Miller
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, MC 0358, La Jolla, California 92093, United States
| | - Jia Song
- Department of Chemistry, Emory University, 1515 Dickey Drive, Northeast, Atlanta, Georgia 30322, United States
| | - Victor S. Batista
- Department of Chemistry and Energy Sciences Institute, Yale University, 225 Prospect Street, New Haven, Connecticut 06520, United States
| | - Tianquan Lian
- Department of Chemistry, Emory University, 1515 Dickey Drive, Northeast, Atlanta, Georgia 30322, United States
| | - Clifford P. Kubiak
- Department of Chemistry and Biochemistry, University of California, San Diego, 9500 Gilman Drive, MC 0358, La Jolla, California 92093, United States
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19
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Barrera M, Ardo S, Crivelli I, Loeb B, Meyer G. The role of lithium cations on the photochemistry of ruthenium complexes in dye-sensitized solar cells: A TDDFT study with the BCL model. J Photochem Photobiol A Chem 2018. [DOI: 10.1016/j.jphotochem.2018.06.036] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/28/2022]
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20
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Mani T, Grills DC. Nitrile Vibration Reports Induced Electric Field and Delocalization of Electron in the Charge-Transfer State of Aryl Nitriles. J Phys Chem A 2018; 122:7293-7300. [DOI: 10.1021/acs.jpca.8b08025] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Tomoyasu Mani
- Department of Chemistry, University of Connecticut, Storrs, Connecticut 06269-3060, United States
| | - David C. Grills
- Chemistry Division, Brookhaven National Laboratory, Upton, New York 11973-5000, United States
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21
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Electric field effect on multi-anchoring molecular architectures: Electron transfer process and opto-electronic property. J Mol Liq 2018. [DOI: 10.1016/j.molliq.2018.03.105] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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22
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Krawczyk S, Nawrocka A, Zdyb A. Charge-transfer excited state in pyrene-1-carboxylic acids adsorbed on titanium dioxide nanoparticles. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2018; 198:19-26. [PMID: 29501002 DOI: 10.1016/j.saa.2018.02.061] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Revised: 02/19/2018] [Accepted: 02/22/2018] [Indexed: 06/08/2023]
Abstract
The electronic structure of excited photosensitizer adsorbed at the surface of a solid is the key factor in the electron transfer processes that underlie the efficiency of dye-sensitized solar cells and photocatalysts. In this work, Stark effect (electroabsorption) spectroscopy has been used to measure the polarizability and dipole moment changes in electronic transitions of pyrene-1-carboxylic (PCA), -acetic (PAA) and -butyric (PBA) acids in ethanol, both free and adsorbed on colloidal TiO2, in glassy ethanol at low temperature. The lack of appreciable increase of dipole moment in the excited state of free and adsorbed PAA and PBA points that two or more single bonds completely prevent the expansion of π-electrons from the aromatic ring towards the carboxylic group, thus excluding the possibility of direct electron injection into TiO2. In free PCA, the pyrene's forbidden S0→S1 transition has increased intensity, exhibits a long progression in 1400cm-1 Ag mode and is associated with |∆μ| of 2 D. Adsorption of PCA on TiO2 causes a broadening and red shift of the S0→S1 absorption band and an increase in dipole moment change on electronic excitation to |∆μ|=6.5 D. This value increased further to about 15 D when the content of acetic acid in the colloid was changed from 0.2% to 2%, and this effect is ascribed to the surface electric field. The large increase of |∆μ| points that the electric field effect can not only change the energetics of electron transfer from the excited sensitizer into the solid, but can also shift the molecular electronic density, thus directly influencing the electronic coupling factor relevant for electron transfer at the molecule-solid interface.
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Affiliation(s)
- S Krawczyk
- Institute of Physics, Maria Curie-Skłodowska University, 20-031 Lublin, Poland.
| | - A Nawrocka
- Institute of Physics, Maria Curie-Skłodowska University, 20-031 Lublin, Poland
| | - A Zdyb
- Faculty of Environmental Engineering, Lublin University of Technology, 20-618 Lublin, Poland
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23
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Troian-Gautier L, DiMarco BN, Sampaio RN, Marquard SL, Meyer GJ. Evidence that ΔS‡ Controls Interfacial Electron Transfer Dynamics from Anatase TiO2 to Molecular Acceptors. J Am Chem Soc 2018; 140:3019-3029. [DOI: 10.1021/jacs.7b13243] [Citation(s) in RCA: 25] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/29/2022]
Affiliation(s)
- Ludovic Troian-Gautier
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Brian N. DiMarco
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Renato N. Sampaio
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Seth L. Marquard
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
| | - Gerald J. Meyer
- Department of Chemistry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
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24
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DiMarco BN, Troian-Gautier L, Sampaio RN, Meyer GJ. Dye-sensitized electron transfer from TiO 2 to oxidized triphenylamines that follows first-order kinetics. Chem Sci 2018; 9:940-949. [PMID: 29629161 PMCID: PMC5874694 DOI: 10.1039/c7sc03839a] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2017] [Accepted: 11/16/2017] [Indexed: 11/21/2022] Open
Abstract
Two sensitizers, [Ru(bpy)2(dcb)]2+ (RuC) and [Ru(bpy)2(dpb)]2+ (RuP), where bpy is 2,2'-bipyridine, dcb is 4,4'-dicarboxylic acid-2,2'-bipyridine and dpb is 4,4'-diphosphonic acid-2,2'-bipyridine, were anchored to mesoporous TiO2 thin films and utilized to sensitize the reaction of TiO2 electrons with oxidized triphenylamines, TiO2(e-) + TPA+ → TiO2 + TPA, to visible light in CH3CN electrolytes. A family of four symmetrically substituted triphenylamines (TPAs) with formal Eo(TPA+/0) reduction potentials that spanned a 0.5 eV range was investigated. Surprisingly, the reaction followed first-order kinetics for two TPAs that provided the largest thermodynamic driving force. Such first-order reactivity indicates a strong Coulombic interaction between TPA+ and TiO2 that enables the injected electron to tunnel back in one concerted step. The kinetics for the other TPA derivatives were non-exponential and were modelled with the Kohlrausch-William-Watts (KWW) function. A Perrin-like reaction sphere model is proposed to rationalize the kinetic data. The activation energies were the same for all of the TPAs, within experimental error. The average rate constants were found to increase with the thermodynamic driving force, consistent with electron transfer in the Marcus normal region.
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Affiliation(s)
- Brian N DiMarco
- Department of Chemistry , University of North Carolina at Chapel Hill , Chapel Hill , North Carolina 27599-3290 , USA .
| | - Ludovic Troian-Gautier
- Department of Chemistry , University of North Carolina at Chapel Hill , Chapel Hill , North Carolina 27599-3290 , USA .
| | - Renato N Sampaio
- Department of Chemistry , University of North Carolina at Chapel Hill , Chapel Hill , North Carolina 27599-3290 , USA .
| | - Gerald J Meyer
- Department of Chemistry , University of North Carolina at Chapel Hill , Chapel Hill , North Carolina 27599-3290 , USA .
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25
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Chen HY, Ardo S. Direct observation of sequential oxidations of a titania-bound molecular proxy catalyst generated through illumination of molecular sensitizers. Nat Chem 2017; 10:17-23. [DOI: 10.1038/nchem.2892] [Citation(s) in RCA: 41] [Impact Index Per Article: 5.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/25/2016] [Accepted: 10/17/2017] [Indexed: 02/02/2023]
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26
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Ganeshraja AS, Yang M, Xu W, Anbalagan K, Wang J. Photoinduced Interfacial Electron Transfer in 2,2’-Bipyridyl Iron(III) Complex-TiO 2
Nanoparticles in Aqueous Medium. ChemistrySelect 2017. [DOI: 10.1002/slct.201702055] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Ayyakannu Sundaram Ganeshraja
- Mössbauer Effect Data Center; Dalian Institute of Chemical Physics, Chinese Academy of Sciences; Dalian 116023 China
| | - Minghui Yang
- Mössbauer Effect Data Center; Dalian Institute of Chemical Physics, Chinese Academy of Sciences; Dalian 116023 China
| | - Wei Xu
- Beijing Synchrotron Radiation Facility; Institute of High Energy Physics, Chinese Academy of Sciences; Beijing 100049 China
| | | | - Junhu Wang
- Mössbauer Effect Data Center; Dalian Institute of Chemical Physics, Chinese Academy of Sciences; Dalian 116023 China
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27
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Sampaio RN, Müller AV, Polo AS, Meyer GJ. Correlation Between Charge Recombination and Lateral Hole-Hopping Kinetics in a Series of cis-Ru(phen')(dcb)(NCS) 2 Dye-Sensitized Solar Cells. ACS APPLIED MATERIALS & INTERFACES 2017; 9:33446-33454. [PMID: 28471164 DOI: 10.1021/acsami.7b01542] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Four complexes of the general form cis-Ru(phen')(dcb)(NCS)2, where dcb is 4,4'-(CO2H)2-2,2'-bipyridine and phen' is 1,10-phenanthroline (phen), 4,7-(C6H5)2-phen (Ph2-phen), 4,7-(CH3)2-phen (Me2-phen), or 3,4,7,8-(CH3)4-phen (Me4-phen), were anchored to mesoporous TiO2 thin films for applications as sensitizers in dye-sensitized solar cells (DSSCs). The compounds displayed metal based reductions Eo(RuIII/II) = 1.01 ± 0.05 V vs NHE and were potent reductants competent of excited-state electron transfer to TiO2 with yields ϕinj ≥ 0.75 in acetonitrile electrolytes. Average charge recombination rate constants, kcr, abstracted from nanosecond transient absorption measurements, and the apparent diffusion coefficients for lateral hole-hopping, abstracted from chronabsorptometry measurements, showed the same sensitizer dependency: Ru(Me4-phen) > Ru(Ph2-phen) > Ru(Me2-phen) ≈ Ru(phen). When used in operational solar cells, Ru(Ph2-phen) was most optimal with an efficiency of (6.6 ± 0.5)% in ionic liquids under 1 sun illumination. The superior performance of Ru(Ph2-phen) was traced to a higher injection yield and more efficient regeneration due to an unusually small sensitivity of kcr to the number of injected electrons.
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Affiliation(s)
- Renato N Sampaio
- Department of Chemistry, University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599, United States
| | - Andressa V Müller
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC-UFABC , Av dos Estados, 5001, 09210-580 Santo André, São Paulo, Brazil
| | - André S Polo
- Centro de Ciências Naturais e Humanas, Universidade Federal do ABC-UFABC , Av dos Estados, 5001, 09210-580 Santo André, São Paulo, Brazil
| | - Gerald J Meyer
- Department of Chemistry, University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599, United States
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28
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Beauvilliers EE, Malewschik T, Meyer GJ. Alcohol‐Based Sensitizer–Semiconductor Linkages Towards Improved Interfacial Electron Transfer Kinetics. CHEMPHOTOCHEM 2017. [DOI: 10.1002/cptc.201700040] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Affiliation(s)
- Evan E. Beauvilliers
- Department of Chemistry The University of North Carolina at Chapel Hill 123 South Road Chapel Hill North Carolina 27599-3290 USA
| | - Talita Malewschik
- Department of Chemistry The University of North Carolina at Chapel Hill 123 South Road Chapel Hill North Carolina 27599-3290 USA
| | - Gerald J. Meyer
- Department of Chemistry The University of North Carolina at Chapel Hill 123 South Road Chapel Hill North Carolina 27599-3290 USA
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29
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Horwitz NE, Phelan BT, Nelson JN, Mauck CM, Krzyaniak MD, Wasielewski MR. Spin Polarization Transfer from a Photogenerated Radical Ion Pair to a Stable Radical Controlled by Charge Recombination. J Phys Chem A 2017; 121:4455-4463. [DOI: 10.1021/acs.jpca.7b03468] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Affiliation(s)
- Noah E. Horwitz
- Department
of Chemistry, ‡Argonne−Northwestern Solar Energy Research
(ANSER) Center, and §Institute for Sustainability and Energy at Northwestern, Northwestern University, Evanston, Illinois 60208-3113, United States
| | - Brian T. Phelan
- Department
of Chemistry, ‡Argonne−Northwestern Solar Energy Research
(ANSER) Center, and §Institute for Sustainability and Energy at Northwestern, Northwestern University, Evanston, Illinois 60208-3113, United States
| | - Jordan N. Nelson
- Department
of Chemistry, ‡Argonne−Northwestern Solar Energy Research
(ANSER) Center, and §Institute for Sustainability and Energy at Northwestern, Northwestern University, Evanston, Illinois 60208-3113, United States
| | - Catherine M. Mauck
- Department
of Chemistry, ‡Argonne−Northwestern Solar Energy Research
(ANSER) Center, and §Institute for Sustainability and Energy at Northwestern, Northwestern University, Evanston, Illinois 60208-3113, United States
| | - Matthew D. Krzyaniak
- Department
of Chemistry, ‡Argonne−Northwestern Solar Energy Research
(ANSER) Center, and §Institute for Sustainability and Energy at Northwestern, Northwestern University, Evanston, Illinois 60208-3113, United States
| | - Michael R. Wasielewski
- Department
of Chemistry, ‡Argonne−Northwestern Solar Energy Research
(ANSER) Center, and §Institute for Sustainability and Energy at Northwestern, Northwestern University, Evanston, Illinois 60208-3113, United States
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30
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Koch M, Myahkostupov M, Oblinsky DG, Wang S, Garakyaraghi S, Castellano FN, Scholes GD. Charge Localization after Ultrafast Photoexcitation of a Rigid Perylene Perylenediimide Dyad Visualized by Transient Stark Effect. J Am Chem Soc 2017; 139:5530-5537. [DOI: 10.1021/jacs.7b01630] [Citation(s) in RCA: 25] [Impact Index Per Article: 3.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Marius Koch
- Department
of Chemistry, Princeton University, Washington Road, Princeton, New Jersey 08540, United States
| | - Mykhaylo Myahkostupov
- Department
of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, United States
| | - Daniel G. Oblinsky
- Department
of Chemistry, Princeton University, Washington Road, Princeton, New Jersey 08540, United States
| | - Siwei Wang
- Department
of Chemistry, Princeton University, Washington Road, Princeton, New Jersey 08540, United States
| | - Sofia Garakyaraghi
- Department
of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, United States
| | - Felix N. Castellano
- Department
of Chemistry, North Carolina State University, Raleigh, North Carolina 27695-8204, United States
| | - Gregory D. Scholes
- Department
of Chemistry, Princeton University, Washington Road, Princeton, New Jersey 08540, United States
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31
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Sorenson SA, Patrow JG, Dawlaty JM. Solvation Reaction Field at the Interface Measured by Vibrational Sum Frequency Generation Spectroscopy. J Am Chem Soc 2017; 139:2369-2378. [DOI: 10.1021/jacs.6b11940] [Citation(s) in RCA: 57] [Impact Index Per Article: 8.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Shayne A. Sorenson
- Department of Chemistry, University of Southern California, Los Angeles, California 90089, United States
| | - Joel G. Patrow
- Department of Chemistry, University of Southern California, Los Angeles, California 90089, United States
| | - Jahan M. Dawlaty
- Department of Chemistry, University of Southern California, Los Angeles, California 90089, United States
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32
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Specific interaction between dyes and ions in dye-sensitized solar cells observed with temporal spectral shift of dyes. J Photochem Photobiol A Chem 2017. [DOI: 10.1016/j.jphotochem.2016.11.004] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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33
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Saygili Y, Söderberg M, Pellet N, Giordano F, Cao Y, Muñoz-García AB, Zakeeruddin SM, Vlachopoulos N, Pavone M, Boschloo G, Kavan L, Moser JE, Grätzel M, Hagfeldt A, Freitag M. Copper Bipyridyl Redox Mediators for Dye-Sensitized Solar Cells with High Photovoltage. J Am Chem Soc 2016; 138:15087-15096. [PMID: 27749064 DOI: 10.1021/jacs.6b10721] [Citation(s) in RCA: 124] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Redox mediators play a major role determining the photocurrent and the photovoltage in dye-sensitized solar cells (DSCs). To maintain the photocurrent, the reduction of oxidized dye by the redox mediator should be significantly faster than the electron back transfer between TiO2 and the oxidized dye. The driving force for dye regeneration with the redox mediator should be sufficiently low to provide high photovoltages. With the introduction of our new copper complexes as promising redox mediators in DSCs both criteria are satisfied to enhance power conversion efficiencies. In this study, two copper bipyridyl complexes, Cu(II/I)(dmby)2TFSI2/1 (0.97 V vs SHE, dmby = 6,6'-dimethyl-2,2'-bipyridine) and Cu(II/I)(tmby)2TFSI2/1 (0.87 V vs SHE, tmby = 4,4',6,6'-tetramethyl-2,2'-bipyridine), are presented as new redox couples for DSCs. They are compared to previously reported Cu(II/I)(dmp)2TFSI2/1 (0.93 V vs SHE, dmp = bis(2,9-dimethyl-1,10-phenanthroline). Due to the small reorganization energy between Cu(I) and Cu(II) species, these copper complexes can sufficiently regenerate the oxidized dye molecules with close to unity yield at driving force potentials as low as 0.1 V. The high photovoltages of over 1.0 V were achieved by the series of copper complex based redox mediators without compromising photocurrent densities. Despite the small driving forces for dye regeneration, fast and efficient dye regeneration (2-3 μs) was observed for both complexes. As another advantage, the electron back transfer (recombination) rates were slower with Cu(II/I)(tmby)2TFSI2/1 as evidenced by longer lifetimes. The solar-to-electrical power conversion efficiencies for [Cu(tmby)2]2+/1+, [Cu(dmby)2]2+/1+, and [Cu(dmp)2]2+/1+ based electrolytes were 10.3%, 10.0%, and 10.3%, respectively, using the organic Y123 dye under 1000 W m-2 AM1.5G illumination. The high photovoltaic performance of Cu-based redox mediators underlines the significant potential of the new redox mediators and points to a new research and development direction for DSCs.
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Affiliation(s)
| | | | | | | | | | | | | | | | - Michele Pavone
- Department of Chemical Sciences, University of Naples Federico II , 80126 Naples, Italy
| | - Gerrit Boschloo
- Department of Chemistry, Ångström Laboratory, Uppsala University , 751 20 Uppsala, Sweden
| | - Ladislav Kavan
- J. Heyrovsky Institute of Physical Chemistry , 1823 Prague, Czech Republic
| | | | | | | | - Marina Freitag
- Department of Chemistry, Ångström Laboratory, Uppsala University , 751 20 Uppsala, Sweden
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34
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Zhu Q, Lu J, Wang Y, Qin F, Shi Z, Xu C. Burstein-Moss Effect Behind Au Surface Plasmon Enhanced Intrinsic Emission of ZnO Microdisks. Sci Rep 2016; 6:36194. [PMID: 27805012 PMCID: PMC5090359 DOI: 10.1038/srep36194] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2016] [Accepted: 10/11/2016] [Indexed: 11/23/2022] Open
Abstract
In this paper, ZnO microdisks with sputtering of Au nanoparticles were prepared to explore their plasmon/exciton coupling effect. An obvious blue shift and enhanced excitonic emission intensity were observed in the PL spectra of as-grown and Au-sputtered ZnO samples at room temperature. The investigation on the absorption spectra and temperature-dependent PL spectra has been demonstrated the Burstein-Moss effect behind the optical phenomena. These results revealed the coupling dynamics between the metal localized surface plasmon and semiconductor exciton.
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Affiliation(s)
- Qiuxiang Zhu
- State Key Laboratory of Bioelectronics, School of Biological Science &Medical Engineering, Southeast University, Nanjing 210096, China.,College of Communication and Electronic Engineering, Hunan City University, Yiyang 413000, China
| | - Junfeng Lu
- State Key Laboratory of Bioelectronics, School of Biological Science &Medical Engineering, Southeast University, Nanjing 210096, China
| | - Yueyue Wang
- State Key Laboratory of Bioelectronics, School of Biological Science &Medical Engineering, Southeast University, Nanjing 210096, China
| | - Feifei Qin
- State Key Laboratory of Bioelectronics, School of Biological Science &Medical Engineering, Southeast University, Nanjing 210096, China
| | - Zengliang Shi
- State Key Laboratory of Bioelectronics, School of Biological Science &Medical Engineering, Southeast University, Nanjing 210096, China
| | - Chunxiang Xu
- State Key Laboratory of Bioelectronics, School of Biological Science &Medical Engineering, Southeast University, Nanjing 210096, China
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35
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Flender O, Scholz M, Klein JR, Oum K, Lenzer T. Excited-state relaxation of the solar cell dye D49 in organic solvents and on mesoporous Al 2O 3 and TiO 2 thin films. Phys Chem Chem Phys 2016; 18:26010-26019. [PMID: 27711569 DOI: 10.1039/c6cp05167g] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
Abstract
We present an ultrafast UV-Vis-NIR transient absorption study of the donor-acceptor solar-cell dye D49 in diisopropyl ether, THF and acetonitrile, as well as on mesoporous Al2O3 and TiO2 thin films. Photoexcitation at 505 nm initially populates the first electronically excited state of the dye having significant intramolecular charge transfer character ("S1/ICT"). On Al2O3 and in the three organic solvents, the dynamics are fully explained in terms of S1/ICT stabilisation (by reorientation of adjacent solvent or D49 molecules and collisional cooling), intramolecular vibrational redistribution and S1/ICT → S0 electronic decay. A substantial decrease of the S1/ICT lifetime is observed with increasing polarity of the surrounding medium suggesting an acceleration of internal conversion. In agreement with these results, the addition of the nonpolar co-adsorbent deoxycholic acid (DCA) to the Al2O3 surface leads to a substantial increase of the S1/ICT lifetime. DCA spacers reduce the local polarity around the dye molecules, thus interrupting D49 "self-solvation". These results are in contrast to a recent experimental study for the indoline dye D131 on Al2O3, where charge transfer from electronically excited D131 to adjacent dye molecules was proposed (Cappel et al., Sci. Rep., 2016, 6, 21276). We do not see evidence for charge transfer processes between D49 molecules and also not for electron injection from D49 into Al2O3 trap states. Charge separation is only observed for D49 bound to TiO2 thin films, with efficient injection of electrons into the conduction band of the semiconductor via formation of a [D49˙+e-] complex and a transient Stark effect signalling the formation of mobile electrons upon dissociation of the complex.
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Affiliation(s)
- Oliver Flender
- Universität Siegen, Physikalische Chemie, Adolf-Reichwein-Str. 2, 57076 Siegen, Germany.
| | - Mirko Scholz
- Universität Siegen, Physikalische Chemie, Adolf-Reichwein-Str. 2, 57076 Siegen, Germany.
| | - Johannes R Klein
- Universität Siegen, Physikalische Chemie, Adolf-Reichwein-Str. 2, 57076 Siegen, Germany.
| | - Kawon Oum
- Universität Siegen, Physikalische Chemie, Adolf-Reichwein-Str. 2, 57076 Siegen, Germany.
| | - Thomas Lenzer
- Universität Siegen, Physikalische Chemie, Adolf-Reichwein-Str. 2, 57076 Siegen, Germany.
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Sobuś J, Gierczyk B, Burdziński G, Jancelewicz M, Polanski E, Hagfeldt A, Ziółek M. Factors Affecting the Performance of Champion Silyl-Anchor Carbazole Dye Revealed in the Femtosecond to Second Studies of Complete ADEKA-1 Sensitized Solar Cells. Chemistry 2016; 22:15807-15818. [PMID: 27633315 DOI: 10.1002/chem.201603059] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/27/2016] [Indexed: 11/07/2022]
Abstract
Record laboratory efficiencies of dye-sensitized solar cells have been recently reported using an alkoxysilyl-anchor dye, ADEKA-1 (over 14 %). In this work we use time-resolved techniques to study the impact of key preparation factors (dye synthesis route, addition of co-adsorbent, use of cobalt-based electrolytes of different redox potential, creation of insulating Al2 O3 layers and molecule capping passivation of the electrode) on the partial charge separation efficiencies in ADEKA-1 solar cells. We have observed that unwanted fast recombination of electrons from titania to the dye, probably associated with the orientation of the dyes on the titania surface, plays a crucial role in the performance of the cells. This recombination, taking place on the sub-ns and ns time scales, is suppressed in the optimized dye synthesis methods and upon addition of the co-adsorbent. Capping treatment significantly reduces the charge recombination between titania and electrolyte, improving the electron lifetime from tens of ms to hundreds of ms, or even to single seconds. Similar increase in electron lifetime is observed for homogenous Al2 O3 over-layers on titania nanoparticles, however, in this case the total solar cells photocurrent is decreased due to smaller electron injection yield from the dye. Our studies should be important for a broader use of very promising silyl-anchor dyes and the further optimization and development of dye-sensitized solar cells.
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Affiliation(s)
- Jan Sobuś
- NanoBioMedical Centre, Adam Mickiewicz University in Poznań, Umultowska 85, 61-614, Poznań, Poland.,Quantum Electronics Laboratory, Faculty of Physics, Adam Mickiewicz University in Poznań, Umultowska 85, 61-614, Poznań, Poland
| | - Błażej Gierczyk
- Faculty of Chemistry, Adam Mickiewicz University in Poznań, Umultowska 89b, 61-614, Poznań, Poland
| | - Gotard Burdziński
- Quantum Electronics Laboratory, Faculty of Physics, Adam Mickiewicz University in Poznań, Umultowska 85, 61-614, Poznań, Poland
| | - Mariusz Jancelewicz
- NanoBioMedical Centre, Adam Mickiewicz University in Poznań, Umultowska 85, 61-614, Poznań, Poland
| | - Enrico Polanski
- Laboratory of Photomolecular Science, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, CH-1015, Lausanne, Switzerland.,Department of Physical Chemistry, University of Tor Vergata-Rome, Via della Ricerca Scientifica 1, 00133, Rome, Italy
| | - Anders Hagfeldt
- Laboratory of Photomolecular Science, Institute of Chemical Sciences and Engineering, École Polytechnique Fédérale de Lausanne, CH-1015, Lausanne, Switzerland
| | - Marcin Ziółek
- Quantum Electronics Laboratory, Faculty of Physics, Adam Mickiewicz University in Poznań, Umultowska 85, 61-614, Poznań, Poland.
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Zhang L, Boschloo G, Hammarström L, Tian H. Solid state p-type dye-sensitized solar cells: concept, experiment and mechanism. Phys Chem Chem Phys 2016; 18:5080-5. [PMID: 26478116 DOI: 10.1039/c5cp05247e] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Solid state p-type dye-sensitized solar cells (p-ssDSCs) have been proposed and fabricated for the first time, using the organic dye P1 as the sensitizer on mesoporous NiO and phenyl-C61-butyric acid methyl ester (PCBM) as the electron conductor. The p-ssDSC has shown an impressive open circuit photovoltage of 620 mV. Femtosecond and nanosecond transient absorption spectroscopy has given evidence for sub-ps hole injection from the excited P1 to NiO, followed by electron transfer from P1˙(-) to PCBM.
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Affiliation(s)
- Lei Zhang
- Physical Chemistry, Department of Chemistry-Ångström Laboratory, Uppsala University, BOX 523, Uppsala SE 75120, Sweden.
| | - Gerrit Boschloo
- Physical Chemistry, Department of Chemistry-Ångström Laboratory, Uppsala University, BOX 523, Uppsala SE 75120, Sweden.
| | - Leif Hammarström
- Physical Chemistry, Department of Chemistry-Ångström Laboratory, Uppsala University, BOX 523, Uppsala SE 75120, Sweden.
| | - Haining Tian
- Physical Chemistry, Department of Chemistry-Ångström Laboratory, Uppsala University, BOX 523, Uppsala SE 75120, Sweden.
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Pydzińska K, Karolczak J, Kosta I, Tena-Zaera R, Todinova A, Idígoras J, Anta JA, Ziółek M. Determination of Interfacial Charge-Transfer Rate Constants in Perovskite Solar Cells. CHEMSUSCHEM 2016; 9:1647-1659. [PMID: 27253726 DOI: 10.1002/cssc.201600210] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2016] [Revised: 04/28/2016] [Indexed: 06/05/2023]
Abstract
A simple protocol to study the dynamics of charge transfer to selective contacts in perovskite solar cells, based on time-resolved laser spectroscopy studies, in which the effect of bimolecular electron-hole recombination has been eliminated, is proposed. Through the proposed procedure, the interfacial charge-transfer rate constants from methylammonium lead iodide perovskite to different contact materials can be determined. Hole transfer is faster for CuSCN (rate constant 0.20 ns(-1) ) than that for 2,2',7,7'-tetrakis-(N,N-di-4-methoxyphenylamino)-9,9'-spirobifluorene (spiro-OMeTAD; 0.06 ns(-1) ), and electron transfer is faster for mesoporous (0.11 ns(-1) ) than that for compact (0.02 ns(-1) ) TiO2 layers. Despite more rapid charge separation, the photovoltaic performance of CuSCN cells is worse than that of spiro-OMeTAD cells; this is explained by faster charge recombination in CuSCN cells, as revealed by impedance spectroscopy. The proposed direction of studies should be one of the key strategies to explore efficient hole-selective contacts as an alternative to spiro-OMeTAD.
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Affiliation(s)
- Katarzyna Pydzińska
- Quantum Electronics Laboratory, Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61-614, Poznań, Poland
| | - Jerzy Karolczak
- Quantum Electronics Laboratory, Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61-614, Poznań, Poland
- Center for Ultrafast Laser Spectroscopy, Adam Mickiewicz University, Umultowska 85, 61-614, Poznań, Poland
| | - Ivet Kosta
- Materials Division, IK4-CIDETEC, Parque Tecnológico de San Sebastián, Paseo Miramón, 196, Donostia-San Sebastián, 20009, Spain
| | - Ramon Tena-Zaera
- Materials Division, IK4-CIDETEC, Parque Tecnológico de San Sebastián, Paseo Miramón, 196, Donostia-San Sebastián, 20009, Spain
| | - Anna Todinova
- Nanostructured Solar Cells Group, Department of Physical, Chemical and Natural Systems, Universidad Pablo de Olavide, Ctra. Utrera, km 1, ES-41013, Seville, Spain
| | - Jesus Idígoras
- Nanostructured Solar Cells Group, Department of Physical, Chemical and Natural Systems, Universidad Pablo de Olavide, Ctra. Utrera, km 1, ES-41013, Seville, Spain
| | - Juan A Anta
- Nanostructured Solar Cells Group, Department of Physical, Chemical and Natural Systems, Universidad Pablo de Olavide, Ctra. Utrera, km 1, ES-41013, Seville, Spain
| | - Marcin Ziółek
- Quantum Electronics Laboratory, Faculty of Physics, Adam Mickiewicz University, Umultowska 85, 61-614, Poznań, Poland.
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Hu K, Blair AD, Piechota EJ, Schauer PA, Sampaio RN, Parlane FGL, Meyer GJ, Berlinguette CP. Kinetic pathway for interfacial electron transfer from a semiconductor to a molecule. Nat Chem 2016; 8:853-9. [DOI: 10.1038/nchem.2549] [Citation(s) in RCA: 73] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/25/2015] [Accepted: 05/10/2016] [Indexed: 11/09/2022]
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40
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On the performance of ruthenium dyes in dye sensitized solar cells: a free cluster approach based on theoretical indexes. J Mol Model 2016; 22:118. [DOI: 10.1007/s00894-016-2984-2] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2015] [Accepted: 04/10/2016] [Indexed: 10/21/2022]
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O'Donnell RM, Sampaio RN, Li G, Johansson PG, Ward CL, Meyer GJ. Photoacidic and Photobasic Behavior of Transition Metal Compounds with Carboxylic Acid Group(s). J Am Chem Soc 2016; 138:3891-903. [PMID: 26901780 DOI: 10.1021/jacs.6b00454] [Citation(s) in RCA: 45] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Excited state proton transfer studies of six Ru polypyridyl compounds with carboxylic acid/carboxylate group(s) revealed that some were photoacids and some were photobases. The compounds [Ru(II)(btfmb)2(LL)](2+), [Ru(II)(dtb)2(LL)](2+), and [Ru(II)(bpy)2(LL)](2+), where bpy is 2,2'-bipyridine, btfmb is 4,4'-(CF3)2-bpy, and dtb is 4,4'-((CH3)3C)2-bpy, and LL is either dcb = 4,4'-(CO2H)2-bpy or mcb = 4-(CO2H),4'-(CO2Et)-2,2'-bpy, were synthesized and characterized. The compounds exhibited intense metal-to-ligand charge-transfer (MLCT) absorption bands in the visible region and room temperature photoluminescence (PL) with long τ > 100 ns excited state lifetimes. The mcb compounds had very similar ground state pKa's of 2.31 ± 0.07, and their characterization enabled accurate determination of the two pKa values for the commonly utilized dcb ligand, pKa1 = 2.1 ± 0.1 and pKa2 = 3.0 ± 0.2. Compounds with the btfmb ligand were photoacidic, and the other compounds were photobasic. Transient absorption spectra indicated that btfmb compounds displayed a [Ru(III)(btfmb(-))L2](2+)* localized excited state and a [Ru(III)(dcb(-))L2](2+)* formulation for all the other excited states. Time dependent PL spectral shifts provided the first kinetic data for excited state proton transfer in a transition metal compound. PL titrations, thermochemical cycles, and kinetic analysis (for the mcb compounds) provided self-consistent pKa* values. The ability to make a single ionizable group photobasic or photoacidic through ligand design was unprecedented and was understood based on the orientation of the lowest-lying MLCT excited state dipole relative to the ligand that contained the carboxylic acid group(s).
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Affiliation(s)
- Ryan M O'Donnell
- Department of Chemistry, University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599, United States
| | - Renato N Sampaio
- Department of Chemistry, University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599, United States
| | - Guocan Li
- Department of Chemistry, University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599, United States
| | - Patrik G Johansson
- Department of Chemistry, University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599, United States
| | - Cassandra L Ward
- Department of Chemistry, University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599, United States
| | - Gerald J Meyer
- Department of Chemistry, University of North Carolina at Chapel Hill , Chapel Hill, North Carolina 27599, United States
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Martín C, Ziółek M, Douhal A. Ultrafast and fast charge separation processes in real dye-sensitized solar cells. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY C-PHOTOCHEMISTRY REVIEWS 2016. [DOI: 10.1016/j.jphotochemrev.2015.12.001] [Citation(s) in RCA: 66] [Impact Index Per Article: 8.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/14/2023]
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43
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Sevinc PC, Dhital B, Govind Rao V, Wang Y, Lu HP. Probing Electric Field Effect on Covalent Interactions at a Molecule–Semiconductor Interface. J Am Chem Soc 2016; 138:1536-42. [PMID: 26735967 DOI: 10.1021/jacs.5b10253] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Papatya C. Sevinc
- Department of Chemistry and
Center for Photochemical Sciences, Bowling Green State University, Bowling
Green, Ohio 43403, United States
| | - Bharat Dhital
- Department of Chemistry and
Center for Photochemical Sciences, Bowling Green State University, Bowling
Green, Ohio 43403, United States
| | - Vishal Govind Rao
- Department of Chemistry and
Center for Photochemical Sciences, Bowling Green State University, Bowling
Green, Ohio 43403, United States
| | - Yuanmin Wang
- Department of Chemistry and
Center for Photochemical Sciences, Bowling Green State University, Bowling
Green, Ohio 43403, United States
| | - H. Peter Lu
- Department of Chemistry and
Center for Photochemical Sciences, Bowling Green State University, Bowling
Green, Ohio 43403, United States
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44
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Govind Rao V, Dhital B, Lu HP. Probing Driving Force and Electron Accepting State Density Dependent Interfacial Electron Transfer Dynamics: Suppressed Fluorescence Blinking of Single Molecules on Indium Tin Oxide Semiconductor. J Phys Chem B 2015; 120:1685-97. [DOI: 10.1021/acs.jpcb.5b08807] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Vishal Govind Rao
- Department
of Chemistry and
Center for Photochemical Sciences, Bowling Green State University, Bowling
Green, Ohio 43403, United States
| | - Bharat Dhital
- Department
of Chemistry and
Center for Photochemical Sciences, Bowling Green State University, Bowling
Green, Ohio 43403, United States
| | - H. Peter Lu
- Department
of Chemistry and
Center for Photochemical Sciences, Bowling Green State University, Bowling
Green, Ohio 43403, United States
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45
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Stark effects in D35-sensitized mesoporous TiO 2 : influence of dye coverage and electrolyte composition. Electrochim Acta 2015. [DOI: 10.1016/j.electacta.2015.01.068] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Watkins KJ, Parkinson BA, Spitler MT. Physical Models for Charge Transfer at Single Crystal Oxide Semiconductor Surfaces as Revealed by the Doping Density Dependence of the Collection Efficiency of Dye Sensitized Photocurrents. J Phys Chem B 2015; 119:7579-88. [PMID: 25742318 DOI: 10.1021/jp511438j] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Affiliation(s)
- Kevin J. Watkins
- Department
of Chemistry and School of Energy Resources, University of Wyoming, Laramie, Wyoming 82071, United States
| | - B. A. Parkinson
- Department
of Chemistry and School of Energy Resources, University of Wyoming, Laramie, Wyoming 82071, United States
| | - M. T. Spitler
- Office
of Science, SC 22.13, Department of Energy, Washington, DC 20585, United States
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Farnum BH, Morseth ZA, Brennaman MK, Papanikolas JM, Meyer TJ. Application of Degenerately Doped Metal Oxides in the Study of Photoinduced Interfacial Electron Transfer. J Phys Chem B 2015; 119:7698-711. [DOI: 10.1021/jp512624u] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/18/2023]
Affiliation(s)
- Byron H. Farnum
- Department
of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599-3290, United States
| | - Zachary A. Morseth
- Department
of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599-3290, United States
| | - M. Kyle Brennaman
- Department
of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599-3290, United States
| | - John M. Papanikolas
- Department
of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599-3290, United States
| | - Thomas J. Meyer
- Department
of Chemistry, University of North Carolina, Chapel Hill, North Carolina 27599-3290, United States
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Yang W, Pazoki M, Eriksson AIK, Hao Y, Boschloo G. A key discovery at the TiO2/dye/electrolyte interface: slow local charge compensation and a reversible electric field. Phys Chem Chem Phys 2015; 17:16744-51. [DOI: 10.1039/c5cp01274k] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
Abstract
Photo-induced absorption spectroscopy on dye-sensitized solar cells reveals reversible electron-induced cation adsorption at the TiO2 surface, resulting in changes of the surface electric field.
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Affiliation(s)
- Wenxing Yang
- Department of Chemistry
- Ångström Laboratory
- Uppsala University
- SE 75120 Uppsala
- Sweden
| | - Meysam Pazoki
- Department of Chemistry
- Ångström Laboratory
- Uppsala University
- SE 75120 Uppsala
- Sweden
| | - Anna I. K. Eriksson
- Department of Chemistry
- Ångström Laboratory
- Uppsala University
- SE 75120 Uppsala
- Sweden
| | - Yan Hao
- Department of Chemistry
- Ångström Laboratory
- Uppsala University
- SE 75120 Uppsala
- Sweden
| | - Gerrit Boschloo
- Department of Chemistry
- Ångström Laboratory
- Uppsala University
- SE 75120 Uppsala
- Sweden
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Yang W, Vlachopoulos N, Hao Y, Hagfeldt A, Boschloo G. Efficient dye regeneration at low driving force achieved in triphenylamine dye LEG4 and TEMPO redox mediator based dye-sensitized solar cells. Phys Chem Chem Phys 2015; 17:15868-75. [DOI: 10.1039/c5cp01880c] [Citation(s) in RCA: 52] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Minimizing the driving force required for the regeneration of oxidized dyes using redox mediators in an electrolyte is essential to further improve the open-circuit voltage and efficiency of dye-sensitized solar cells (DSSCs).
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Affiliation(s)
- Wenxing Yang
- Department of Chemistry – Ångström Laboratory
- Physical Chemistry
- Uppsala University
- 751 20 Uppsala
- Sweden
| | - Nick Vlachopoulos
- Department of Chemistry – Ångström Laboratory
- Physical Chemistry
- Uppsala University
- 751 20 Uppsala
- Sweden
| | - Yan Hao
- Department of Chemistry – Ångström Laboratory
- Physical Chemistry
- Uppsala University
- 751 20 Uppsala
- Sweden
| | - Anders Hagfeldt
- Department of Chemistry – Ångström Laboratory
- Physical Chemistry
- Uppsala University
- 751 20 Uppsala
- Sweden
| | - Gerrit Boschloo
- Department of Chemistry – Ångström Laboratory
- Physical Chemistry
- Uppsala University
- 751 20 Uppsala
- Sweden
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