1
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Yan Y, Song L, Shi Q. Understanding the free energy barrier and multiple timescale dynamics of charge separation in organic photovoltaic cells. J Chem Phys 2018; 148:084109. [DOI: 10.1063/1.5017866] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022] Open
Affiliation(s)
- Yaming Yan
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Zhongguancun, Beijing 100190, China and University of Chinese Academy of Sciences, Beijing 100049, China
| | - Linze Song
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Zhongguancun, Beijing 100190, China and University of Chinese Academy of Sciences, Beijing 100049, China
| | - Qiang Shi
- Beijing National Laboratory for Molecular Sciences, State Key Laboratory for Structural Chemistry of Unstable and Stable Species, CAS Research/Education Center for Excellence in Molecular Sciences, Institute of Chemistry, Chinese Academy of Sciences, Zhongguancun, Beijing 100190, China and University of Chinese Academy of Sciences, Beijing 100049, China
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2
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Sosorev AY, Godovsky DY, Paraschuk DY. Hot kinetic model as a guide to improve organic photovoltaic materials. Phys Chem Chem Phys 2018; 20:3658-3671. [DOI: 10.1039/c7cp06158g] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
The model yields that the most promising ways to increase the OSC performance are decreasing the reorganization energy, increasing the dielectric permittivity and enhancing the charge delocalization.
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Affiliation(s)
- Andrey Yu. Sosorev
- Faculty of Physics and International Laser Center
- M.V. Lomonosov Moscow State University
- Moscow 119991
- Russia
| | - Dmitry Yu. Godovsky
- Institute of Elementoorganic Compounds
- Russian Academy of Science
- Moscow
- Russia
| | - Dmitry Yu. Paraschuk
- Faculty of Physics and International Laser Center
- M.V. Lomonosov Moscow State University
- Moscow 119991
- Russia
- Enikolopov Institute of Synthetic Polymeric Materials
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3
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Xiang B, Li Y, Pham CH, Paesani F, Xiong W. Ultrafast direct electron transfer at organic semiconductor and metal interfaces. SCIENCE ADVANCES 2017; 3:e1701508. [PMID: 29159282 PMCID: PMC5694661 DOI: 10.1126/sciadv.1701508] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/15/2017] [Accepted: 10/19/2017] [Indexed: 06/01/2023]
Abstract
The ability to control direct electron transfer can facilitate the development of new molecular electronics, light-harvesting materials, and photocatalysis. However, control of direct electron transfer has been rarely reported, and the molecular conformation-electron dynamics relationships remain unclear. We describe direct electron transfer at buried interfaces between an organic polymer semiconductor film and a gold substrate by observing the first dynamical electric field-induced vibrational sum frequency generation (VSFG). In transient electric field-induced VSFG measurements on this system, we observe dynamical responses (<150 fs) that depend on photon energy and polarization, demonstrating that electrons are directly transferred from the Fermi level of gold to the lowest unoccupied molecular orbital of organic semiconductor. Transient spectra further reveal that, although the interfaces are prepared without deliberate alignment control, a subensemble of surface molecules can adopt conformations for direct electron transfer. Density functional theory calculations support the experimental results and ascribe the observed electron transfer to a flat-lying polymer configuration in which electronic orbitals are found to be delocalized across the interface. The present observation of direct electron transfer at complex interfaces and the insights gained into the relationship between molecular conformations and electron dynamics will have implications for implementing novel direct electron transfer in energy materials.
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Affiliation(s)
- Bo Xiang
- Materials Science and Engineering Program, University of California, San Diego, La Jolla, CA 92093–0418, USA
| | - Yingmin Li
- Materials Science and Engineering Program, University of California, San Diego, La Jolla, CA 92093–0418, USA
| | - C. Huy Pham
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093–0358, USA
| | - Francesco Paesani
- Materials Science and Engineering Program, University of California, San Diego, La Jolla, CA 92093–0418, USA
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093–0358, USA
| | - Wei Xiong
- Materials Science and Engineering Program, University of California, San Diego, La Jolla, CA 92093–0418, USA
- Department of Chemistry and Biochemistry, University of California, San Diego, La Jolla, CA 92093–0358, USA
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4
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Kästner C, Vandewal K, Egbe DAM, Hoppe H. Revelation of Interfacial Energetics in Organic Multiheterojunctions. ADVANCED SCIENCE (WEINHEIM, BADEN-WURTTEMBERG, GERMANY) 2017; 4:1600331. [PMID: 28435774 PMCID: PMC5396163 DOI: 10.1002/advs.201600331] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/31/2016] [Revised: 09/29/2016] [Indexed: 06/07/2023]
Abstract
Efficient charge generation via exciton dissociation in organic bulk heterojunctions necessitates donor-acceptor interfaces, e.g., between a conjugated polymer and a fullerene derivative. Furthermore, aggregation and corresponding structural order of polymer and fullerene domains result in energetic relaxations of molecular energy levels toward smaller energy gaps as compared to the situation for amorphous phases existing in homogeneously intermixed polymer:fullerene blends. Here it is shown that these molecular energy level shifts are reflected in interfacial charge transfer (CT) transitions and depending on the existence of disordered or ordered interfacial domains. It can be done so by systematically controlling the order at the donor-acceptor interface via ternary blending of semicrystalline and amorphous model polymers with a fullerene acceptor. These variations in interfacial domain order are probed with luminescence spectroscopy, yielding various transition energies due to activation of different recombination channels at the interface. Finally, it is shown that via this analysis the energy landscape at the organic heterojunction interface can be obtained.
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Affiliation(s)
- Christian Kästner
- Institute of PhysicsTechnische Universität IlmenauWeimarer Str. 3298693IlmenauGermany
| | - Koen Vandewal
- Institut für Angewandte PhotophysikTechnische Universität DresdenGeorge‐Bähr‐Str. 101069DresdenGermany
| | - Daniel Ayuk Mbi Egbe
- Institute of Polymeric Materials and TestingJohannes Kepler University LinzAltenbergerstr. 694040LinzAustria
| | - Harald Hoppe
- Institute of PhysicsTechnische Universität IlmenauWeimarer Str. 3298693IlmenauGermany
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5
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Kozlov OV, Liu X, Luponosov YN, Solodukhin AN, Toropynina VY, Min J, Buzin MI, Peregudova SM, Brabec CJ, Ponomarenko SA, Pshenichnikov MS. Triphenylamine-Based Push-Pull Molecule for Photovoltaic Applications: From Synthesis to Ultrafast Device Photophysics. THE JOURNAL OF PHYSICAL CHEMISTRY. C, NANOMATERIALS AND INTERFACES 2017; 121:6424-6435. [PMID: 28413568 PMCID: PMC5388901 DOI: 10.1021/acs.jpcc.6b12068] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Revised: 03/06/2017] [Indexed: 06/07/2023]
Abstract
Small push-pull molecules attract much attention as prospective donor materials for organic solar cells (OSCs). By chemical engineering, it is possible to combine a number of attractive properties such as broad absorption, efficient charge separation, and vacuum and solution processabilities in a single molecule. Here we report the synthesis and early time photophysics of such a molecule, TPA-2T-DCV-Me, based on the triphenylamine (TPA) donor core and dicyanovinyl (DCV) acceptor end group connected by a thiophene bridge. Using time-resolved photoinduced absorption and photoluminescence, we demonstrate that in blends with [70]PCBM the molecule works both as an electron donor and hole acceptor, thereby allowing for two independent channels of charge generation. The charge-generation process is followed by the recombination of interfacial charge transfer states that takes place on the subnanosecond time scale as revealed by time-resolved photoluminescence and nongeminate recombination as follows from the OSC performance. Our findings demonstrate the potential of TPA-DCV-based molecules as donor materials for both solution-processed and vacuum-deposited OSCs.
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Affiliation(s)
- Oleg V. Kozlov
- Zernike
Institute for Advanced Materials, University
of Groningen, Groningen, The Netherlands
- International Laser Center and Faculty
of Physics and Chemistry Department, Moscow State University, Moscow, Russian Federation
| | - Xiaomeng Liu
- Zernike
Institute for Advanced Materials, University
of Groningen, Groningen, The Netherlands
| | - Yuriy N. Luponosov
- Enikolopov Institute of Synthetic Polymeric Materials and Nesmeyanov Institute
of Organoelement Compounds, Russian Academy
of Sciences, Moscow, Russian Federation
| | - Alexander N. Solodukhin
- Enikolopov Institute of Synthetic Polymeric Materials and Nesmeyanov Institute
of Organoelement Compounds, Russian Academy
of Sciences, Moscow, Russian Federation
| | - Victoria Y. Toropynina
- Enikolopov Institute of Synthetic Polymeric Materials and Nesmeyanov Institute
of Organoelement Compounds, Russian Academy
of Sciences, Moscow, Russian Federation
| | - Jie Min
- Institute
of Materials for Electronics and Energy Technology (i-MEET), Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany
| | - Mikhail I. Buzin
- Enikolopov Institute of Synthetic Polymeric Materials and Nesmeyanov Institute
of Organoelement Compounds, Russian Academy
of Sciences, Moscow, Russian Federation
| | - Svetlana M. Peregudova
- Enikolopov Institute of Synthetic Polymeric Materials and Nesmeyanov Institute
of Organoelement Compounds, Russian Academy
of Sciences, Moscow, Russian Federation
| | - Christoph J. Brabec
- Institute
of Materials for Electronics and Energy Technology (i-MEET), Friedrich-Alexander-University Erlangen-Nuremberg, Erlangen, Germany
- Bavarian Center
for Applied
Energy Research (ZAE Bayern), Erlangen, Germany
| | - Sergei A. Ponomarenko
- International Laser Center and Faculty
of Physics and Chemistry Department, Moscow State University, Moscow, Russian Federation
- Enikolopov Institute of Synthetic Polymeric Materials and Nesmeyanov Institute
of Organoelement Compounds, Russian Academy
of Sciences, Moscow, Russian Federation
| | - Maxim S. Pshenichnikov
- Zernike
Institute for Advanced Materials, University
of Groningen, Groningen, The Netherlands
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6
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Serbenta A, Kozlov OV, Portale G, van Loosdrecht PHM, Pshenichnikov MS. Bulk heterojunction morphology of polymer:fullerene blends revealed by ultrafast spectroscopy. Sci Rep 2016; 6:36236. [PMID: 27824085 PMCID: PMC5099942 DOI: 10.1038/srep36236] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/28/2016] [Accepted: 10/13/2016] [Indexed: 01/23/2023] Open
Abstract
Morphology of organic photovoltaic bulk heterojunctions (BHJs) - a nanoscale texture of the donor and acceptor phases - is one of the key factors influencing efficiency of organic solar cells. Detailed knowledge of the morphology is hampered by the fact that it is notoriously difficult to investigate by microscopic methods. Here we all-optically track the exciton harvesting dynamics in the fullerene acceptor phase from which subdivision of the fullerene domain sizes into the mixed phase (2-15 nm) and large (>50 nm) domains is readily obtained via the Monte-Carlo simulations. These results were independently confirmed by a combination of X-ray scattering, electron and atomic-force microscopies, and time-resolved photoluminescence spectroscopy. In the large domains, the excitons are lost due to the high energy disorder while in the ordered materials the excitons are harvested with high efficiency even from the domains as large as 100 nm due to the absence of low-energy traps. Therefore, optimizing of blend nanomorphology together with increasing the material order are deemed as winning strategies in the exciton harvesting optimization.
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Affiliation(s)
- Almis Serbenta
- Zernike Institute for Advanced Materials, University of Groningen, Groningen, the Netherlands
| | - Oleg V. Kozlov
- Zernike Institute for Advanced Materials, University of Groningen, Groningen, the Netherlands
- International Laser Center and Faculty of Physics, Moscow State University, Russian Federation
| | - Giuseppe Portale
- Zernike Institute for Advanced Materials, University of Groningen, Groningen, the Netherlands
| | | | - Maxim S. Pshenichnikov
- Zernike Institute for Advanced Materials, University of Groningen, Groningen, the Netherlands
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7
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Sosorev AY, Parashchuk OD, Zapunidi SA, Kashtanov GS, Golovnin IV, Kommanaboyina S, Perepichka IF, Paraschuk DY. Threshold-like complexation of conjugated polymers with small molecule acceptors in solution within the neighbor-effect model. Phys Chem Chem Phys 2016; 18:4684-96. [PMID: 26799407 DOI: 10.1039/c5cp05266a] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/03/2023]
Abstract
In some donor-acceptor blends based on conjugated polymers, a pronounced charge-transfer complex (CTC) forms in the electronic ground state. In contrast to small-molecule donor-acceptor blends, the CTC concentration in polymer:acceptor solution can increase with the acceptor content in a threshold-like way. This threshold-like behavior was earlier attributed to the neighbor effect (NE) in the polymer complexation, i.e., next CTCs are preferentially formed near the existing ones; however, the NE origin is unknown. To address the factors affecting the NE, we record the optical absorption data for blends of the most studied conjugated polymers, poly(2-methoxy-5-(2-ethylhexyloxy)-1,4-phenylenevinylene) (MEH-PPV) and poly(3-hexylthiophene) (P3HT), with electron acceptors of fluorene series, 1,8-dinitro-9,10-antraquinone (), and 7,7,8,8-tetracyanoquinodimethane () in different solvents, and then analyze the data within the NE model. We have found that the NE depends on the polymer and acceptor molecular skeletons and solvent, while it does not depend on the acceptor electron affinity and polymer concentration. We conclude that the NE operates within a single macromolecule and stems from planarization of the polymer chain involved in the CTC with an acceptor molecule; as a result, the probability of further complexation with the next acceptor molecules at the adjacent repeat units increases. The steric and electronic microscopic mechanisms of NE are discussed.
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Affiliation(s)
- Andrey Yu Sosorev
- Faculty of Physics and International Laser Center, M.V. Lomonosov Moscow State University, Moscow 119991, Russia.
| | - Olga D Parashchuk
- Faculty of Physics and International Laser Center, M.V. Lomonosov Moscow State University, Moscow 119991, Russia.
| | - Sergey A Zapunidi
- Faculty of Physics and International Laser Center, M.V. Lomonosov Moscow State University, Moscow 119991, Russia.
| | - Grigoriy S Kashtanov
- Faculty of Physics and International Laser Center, M.V. Lomonosov Moscow State University, Moscow 119991, Russia.
| | - Ilya V Golovnin
- Faculty of Physics and International Laser Center, M.V. Lomonosov Moscow State University, Moscow 119991, Russia.
| | | | | | - Dmitry Yu Paraschuk
- Faculty of Physics and International Laser Center, M.V. Lomonosov Moscow State University, Moscow 119991, Russia.
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8
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Akkuratov AV, Susarova DK, Kozlov OV, Chernyak AV, Moskvin YL, Frolova LA, Pshenichnikov MS, Troshin PA. Design of (X-DADAD)n Type Copolymers for Efficient Bulk Heterojunction Organic Solar Cells. Macromolecules 2015. [DOI: 10.1021/ma5023956] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/21/2022]
Affiliation(s)
- Alexander V. Akkuratov
- Institute
for Problems of Chemical Physics, Russian Academy of Sciences, Semenov Prospect 1, Chernogolovka 142432, Russian Federation
| | - Diana K. Susarova
- Institute
for Problems of Chemical Physics, Russian Academy of Sciences, Semenov Prospect 1, Chernogolovka 142432, Russian Federation
| | - Oleg V. Kozlov
- Zernike
Institute of Advanced Materials, University of Groningen, Nijenborgh
4, 9747 AG Groningen, The Netherlands
- Faculty of Physics & International Laser Center, Lomonosov Moscow State University, Leninskie Gory 1, 119991, Moscow, Russia
| | - Alexander V. Chernyak
- Institute
for Problems of Chemical Physics, Russian Academy of Sciences, Semenov Prospect 1, Chernogolovka 142432, Russian Federation
| | - Yuriy L. Moskvin
- Institute
for Energy Problems of Chemical Physics, Russian Academy of Sciences (Branch), Semenov Prospect 1/10, Chernogolovka, Moscow Region 142432, Russian Federation
| | - Lubov A. Frolova
- Institute
for Problems of Chemical Physics, Russian Academy of Sciences, Semenov Prospect 1, Chernogolovka 142432, Russian Federation
| | - Maxim S. Pshenichnikov
- Zernike
Institute of Advanced Materials, University of Groningen, Nijenborgh
4, 9747 AG Groningen, The Netherlands
| | - Pavel A. Troshin
- Institute
for Problems of Chemical Physics, Russian Academy of Sciences, Semenov Prospect 1, Chernogolovka 142432, Russian Federation
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9
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Towards High Performance Organic Photovoltaic Cells: A Review of Recent Development in Organic Photovoltaics. Polymers (Basel) 2014. [DOI: 10.3390/polym6092473] [Citation(s) in RCA: 61] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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10
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Jones ML, Dyer R, Clarke N, Groves C. Are hot charge transfer states the primary cause of efficient free-charge generation in polymer:fullerene organic photovoltaic devices? A kinetic Monte Carlo study. Phys Chem Chem Phys 2014; 16:20310-20. [DOI: 10.1039/c4cp01626b] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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11
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12
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Sosorev A, Zapunidi S. Neighbor effect in complexation of a conjugated polymer. J Phys Chem B 2013; 117:10913-9. [PMID: 23931145 DOI: 10.1021/jp403457g] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Charge-transfer complex (CTC) formation between a conjugated polymer and low-molecular-weight organic acceptor is proposed to be driven by the neighbor effect. Formation of a CTC on the polymer chain results in an increased probability of new CTC formation near the existing one. We present an analytical model for CTC distribution considering the neighbor effect, based on the principles of statistical mechanics. This model explains the experimentally observed threshold-like dependence of the CTC concentration on the acceptor content in a polymer:acceptor blend. It also allows us to evaluate binding energies of the complexes.
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Affiliation(s)
- Andrey Sosorev
- Faculty of Physics and International Laser Center, M.V. Lomonosov Moscow State University , Moscow 119991, Russia
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13
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Parashchuk OD, Grigorian S, Levin EE, Bruevich VV, Bukunov K, Golovnin IV, Dittrich T, Dembo KA, Volkov VV, Paraschuk DY. Acceptor-Enhanced Local Order in Conjugated Polymer Films. J Phys Chem Lett 2013; 4:1298-1303. [PMID: 26282143 DOI: 10.1021/jz400333k] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Disorder in conjugated polymers is a general drawback that limits their use in organic electronics. We show that an archetypical conjugated polymer, MEH-PPV, enhances its local structural and electronic order upon addition of an electronic acceptor, trinitrofluorenone (TNF). First, acceptor addition in MEH-PPV results in a highly structured XRD pattern characteristic for semicrystalline conjugated polymers. Second, the surface roughness of the MEH-PPV films increases upon small acceptor addition, implying formation of crystalline nanodomains. Third, the low-frequency Raman features of the polymer are narrowed upon TNF addition and indicate decreased inhomogeneous broadening. Finally, the photoinduced absorption and surface photovoltage spectroscopy data show that photoexcited and dark polymer intragap electronic states assigned to deep defects disappear in the blend. We relate the enhanced order to formation of a charge-transfer complex between MEH-PPV and TNF in the electronic ground state. These findings may be of high importance to control structural properties as they demonstrate an approach to increasing the order of a conjugated polymer by using an acceptor additive.
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Affiliation(s)
| | - Souren Grigorian
- §Institute of Physics, University of Siegen, Emmy-Noether-Campus, Walter-Flex-Strasse 3, D-57068 Siegen, Germany
| | | | | | | | | | - Thomas Dittrich
- #Helmholtz-Zentrum Berlin, Hahn-Meitner-Platz 1, 14109 Berlin, Germany
| | - Kirill A Dembo
- ∇Shubnikov Institute of Crystallography of the Russian Academy of Sciences, Leninskii prospekt 59, 119333 Moscow, Russia
| | - Vladimir V Volkov
- ∇Shubnikov Institute of Crystallography of the Russian Academy of Sciences, Leninskii prospekt 59, 119333 Moscow, Russia
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14
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Graphene oxide-induced conformation changes of glucose oxidase studied by infrared spectroscopy. Colloids Surf B Biointerfaces 2013; 109:115-20. [PMID: 23624279 DOI: 10.1016/j.colsurfb.2013.03.033] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2012] [Revised: 03/07/2013] [Accepted: 03/19/2013] [Indexed: 12/20/2022]
Abstract
The adsorption of proteins on the surface of nanomaterials can induce changes in the structure and biological activity of the proteins. Although there have been a number of studies aimed at developing an understanding of the interactions of proteins with surfaces of nanomaterials, a detailed description of the actual state of the adsorbed proteins or the functional consequences of protein adsorption onto nanomaterials has yet to be reported. In this study, the conformation changes of glucose oxidase (GOx) induced by adsorption on graphene oxide (GO) sheets were investigated by quantitative second-derivative infrared analysis and two-dimensional infrared correlation spectroscopy (2D IR). The adsorption of GOx on GO sheets resulted in the conversion of α-helix to β-sheet structures and therefore led to substantial conformation changes of GOx, even the unfolding of the protein. These alterations in the conformation of GOx caused a significant decrease in the catalytic activity of the enzyme for glucose oxidation. This study demonstrates that nanomaterials can strongly influence the conformation and activity of adsorbed proteins. In addition to the importance of this effect in cases of the direct adsorption of proteins on nanomaterials, the results have implications for proteins adsorbed on materials with nanometer-scale surface roughness.
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15
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Pavelyev VG, Parashchuk OD, Orekhova TV, Perepichka IF, Paraschuk DY, van Loosdrecht PHM, Pshenichnikov MS. Acceptor Energy Offset Manages Ultrafast Recombination Dynamics in Donor-Acceptor Mixtures. EPJ WEB OF CONFERENCES 2013. [DOI: 10.1051/epjconf/20134105036] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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16
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Bakulin AA, Rao A, Pavelyev VG, van Loosdrecht PHM, Pshenichnikov MS, Niedzialek D, Cornil J, Beljonne D, Friend RH. The role of driving energy and delocalized States for charge separation in organic semiconductors. Science 2012; 335:1340-4. [PMID: 22362882 DOI: 10.1126/science.1217745] [Citation(s) in RCA: 551] [Impact Index Per Article: 45.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/02/2022]
Abstract
The electron-hole pair created via photon absorption in organic photoconversion systems must overcome the Coulomb attraction to achieve long-range charge separation. We show that this process is facilitated through the formation of excited, delocalized band states. In our experiments on organic photovoltaic cells, these states were accessed for a short time (<1 picosecond) via infrared (IR) optical excitation of electron-hole pairs bound at the heterojunction. Atomistic modeling showed that the IR photons promote bound charge pairs to delocalized band states, similar to those formed just after singlet exciton dissociation, which indicates that such states act as the gateway for charge separation. Our results suggest that charge separation in efficient organic photoconversion systems occurs through hot-state charge delocalization rather than energy-gradient-driven intermolecular hopping.
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Affiliation(s)
- Artem A Bakulin
- Cavendish laboratory, University of Cambridge, Cambridge, UK
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17
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Wise AJ, Grey JK. Resonance Raman studies of excited state structural displacements of conjugated polymers in donor/acceptor charge transfer complexes. Phys Chem Chem Phys 2012; 14:11273-6. [DOI: 10.1039/c2cp41748k] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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18
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Parashchuk OD, Laptinskaya TV, Paraschuk DY. Macromolecular dynamics of conjugated polymer in donor–acceptor blends with charge transfer complex. Phys Chem Chem Phys 2011; 13:3775-81. [DOI: 10.1039/c0cp01710h] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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19
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Enhanced Photostability and Red-NIR Photosensitivity of Conjugated Polymer Charge-Transfer Complexes. ACTA ACUST UNITED AC 2010. [DOI: 10.1002/masy.201051021] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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20
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Wang Q, Xu W, Wu P, Zhang H, Cai C, Zhao B. New Insights into the Effects of Thermal Treatment on the Catalytic Activity and Conformational Structure of Glucose Oxidase Studied by Electrochemistry, IR Spectroscopy, and Theoretical Calculation. J Phys Chem B 2010; 114:12754-64. [DOI: 10.1021/jp106214v] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/25/2022]
Affiliation(s)
- Qian Wang
- Jiangsu Key Laboratory of Biofunctional Materials, Laboratory of Electrochemistry, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210097, People’s Republic of China
| | - Wang Xu
- Jiangsu Key Laboratory of Biofunctional Materials, Laboratory of Electrochemistry, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210097, People’s Republic of China
| | - Ping Wu
- Jiangsu Key Laboratory of Biofunctional Materials, Laboratory of Electrochemistry, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210097, People’s Republic of China
| | - Hui Zhang
- Jiangsu Key Laboratory of Biofunctional Materials, Laboratory of Electrochemistry, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210097, People’s Republic of China
| | - Chenxin Cai
- Jiangsu Key Laboratory of Biofunctional Materials, Laboratory of Electrochemistry, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210097, People’s Republic of China
| | - Bo Zhao
- Jiangsu Key Laboratory of Biofunctional Materials, Laboratory of Electrochemistry, College of Chemistry and Materials Science, Nanjing Normal University, Nanjing 210097, People’s Republic of China
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21
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Affiliation(s)
- Tracey M Clarke
- Centre for Plastic Electronics, Department of Chemistry, Imperial College London, London, SW7 2AZ, United Kingdom
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22
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Xiong W, Laaser JE, Paoprasert P, Franking RA, Hamers RJ, Gopalan P, Zanni MT. Transient 2D IR Spectroscopy of Charge Injection in Dye-Sensitized Nanocrystalline Thin Films. J Am Chem Soc 2009; 131:18040-1. [DOI: 10.1021/ja908479r] [Citation(s) in RCA: 77] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Wei Xiong
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706
| | - Jennifer E. Laaser
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706
| | - Peerasak Paoprasert
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706
| | - Ryan A. Franking
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706
| | - Robert J. Hamers
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706
| | - Padma Gopalan
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706
| | - Martin T. Zanni
- Department of Chemistry, University of Wisconsin-Madison, 1101 University Avenue, Madison, Wisconsin 53706
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23
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Chi SH, Hales JM, Cozzuol M, Ochoa C, Fitzpatrick M, Perry JW. Conjugated polymer-fullerene blend with strong optical limiting in the near-infrared. OPTICS EXPRESS 2009; 17:22062-22072. [PMID: 19997452 DOI: 10.1364/oe.17.022062] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/28/2023]
Abstract
Optical-quality, melt processable thick films of a conjugated polymer blend containing poly(2-methoxy-5-(2-ethyl-hexyloxy)-(phenylene vinylene)) (MEH-PPV), a C(60) derivative (PCBM) and a plasticizer (1,2-di-iso-octylphthalate) have been developed and their nonlinear absorption and optical limiting properties have been investigated. These blend materials exhibited strong optical limiting characteristics in the near infrared region (750-900 nm), with broad temporal dynamic range spanning femtosecond to nanosecond pulse widths. The dispersion of the optical limiting figure-of-merit of the MEH-PPV:PCBM:DOP blend shows a peak near the wavelength of the MEH-PPV cation, indicating an important role of one-photon and two-photon induced charge transfer in the nonlinear absorption response.
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Affiliation(s)
- San-Hui Chi
- School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332, USA
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24
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Bakulin AA, Martyanov D, Paraschuk DY, Loosdrecht PHV, Pshenichnikov MS. Charge-transfer complexes of conjugated polymers as intermediates in charge photogeneration for organic photovoltaics. Chem Phys Lett 2009. [DOI: 10.1016/j.cplett.2009.09.052] [Citation(s) in RCA: 31] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
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25
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Bakulin AA, Zapunidy SA, Pshenichnikov MS, van Loosdrecht PHM, Paraschuk DY. Efficient two-step photogeneration of long-lived charges in ground-state charge-transfer complexes of conjugated polymer doped with fullerene. Phys Chem Chem Phys 2009; 11:7324-30. [PMID: 19672545 DOI: 10.1039/b905249f] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Polarization-sensitive time-resolved visible-infrared pump-probe experiments demonstrate that one can efficiently generate long-lived charges in donor-acceptor charge transfer complex (CTC) of conjugated polymer doped with fullerene, MEH-PPV/dinitroanthraquinone/C(60). In particular, a strong enhancement of the photoinduced charge generation is observed in the red part of the spectrum, i.e. inside the polymer band gap, which makes the current material attractive for photovoltaic applications. The spectroscopic results indicate that enhanced generation of charges is due to a consecutive photoinduced electron transfer from the polymer to the CTC-acceptor in the first step and then, in the second step, to the fullerene. The LUMO energy difference between the CTC-acceptor and fullerene appears to be a key parameter for efficient charge separation in these ternary systems. The results are also discussed in respect to the charge generation processes in widely used polymer-fullerene blends, where formation of weak CTCs has recently been discovered.
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Affiliation(s)
- Artem A Bakulin
- Zernike Institute for Advanced Materials, University of Groningen, Groningen, The Netherlands
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