Dramatic enhancement of photo-oxidation stability of a conjugated polymer in blends with organic acceptor

Golovnin, I V; Bakulin, Artem A.; Zapunidy, Sergey A.; Nechvolodova, E. M.; Paraschuk, Dmitry Yu.

doi:10.1063/1.2945801

Cited by 28 publications

(29 citation statements)

References 26 publications

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“…The observed enhancement in photostability of MEH-PPV in MEH-PPV:TNF blends is in good agreement with the recent photostability data on these blends obtained by FTIR spectroscopy. [4] Therefore, it is natural to assign the observed drop in the photobleaching rate of the blends with decrease in the photooxidation rate of MEH-PPV. The photostability enhancement in MEH-PPV:TNF blends was explained by blocking of formation of triplet excitons at the polymer, [4] which are known to be one of the key precursors for photooxidation of PPVs.…”

Section: Resultsmentioning

confidence: 98%

“…[4] Therefore, it is natural to assign the observed drop in the photobleaching rate of the blends with decrease in the photooxidation rate of MEH-PPV. The photostability enhancement in MEH-PPV:TNF blends was explained by blocking of formation of triplet excitons at the polymer, [4] which are known to be one of the key precursors for photooxidation of PPVs. [12] This triplet blocking can be due to fast energy transfer from photoexcited MEH-PPV conjugated segments to CTC.…”

Section: Resultsmentioning

confidence: 98%

“…[3] Moreover, the CTC formation dramatically improves the photooxidation stability of the blend. [4] In this paper, we report our results on photostability and photoelectric studies of MEH-PPV:TNF CTCs. We study photodegradation of MEH-PPV:TNF blend films by a laser photobleaching method.…”

Section: Introductionmentioning

confidence: 99%

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Enhanced Photostability and Red‐NIR Photosensitivity of Conjugated Polymer Charge‐Transfer Complexes

Ozimova

Bruevich

Dittrich

et al. 2010

Macromolecular Symposia

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Summary: A promising route to photostable and low-bandgap polymer materials for optoelectronic and photonic applications could be utilization of donor-acceptor ground-state charge-transfer complexes (CTCs) of wide-bandgap conjugated polymers. In this work, we report our results on photostability and photoelectric studies of CTC between an archetypical conjugated polymer MEH-PPV and low-molecularweight acceptor 2,4,7-trinitrofluorenone (TNF). By using the pump-probe laser photobleaching technique, we show that the photodegradation rate of MEH-PPV:TNF blend films decreases up to four orders of magnitude as compared with pristine MEH-PPV. By using photocurrent and surface photovoltage spectroscopies, we demonstrate that the photoelectric sensitivity of the MEH-PPV:TNF CTC can be deeply extended in the polymer optical gap down to 1 mm. However, the main drawback of the CTC studied is their low charge collection efficiency, and an approach to increasing it is discussed.

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Section: Resultsmentioning

confidence: 98%

Section: Resultsmentioning

confidence: 98%

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Enhanced Photostability and Red‐NIR Photosensitivity of Conjugated Polymer Charge‐Transfer Complexes

Ozimova

Bruevich

Dittrich

et al. 2010

Macromolecular Symposia

Self Cite

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“…Another option is the use of a semi-solid state gel as electrolyte. Many of the gels investigated thus far have a lowered conversion efficiency, but a gel polymer incorporating TiO 2 nanoparticles has been reported to have a conversion efficiency similar to DS(S)Cs with liquid electrolyte [60][61][62][63][64][65]. However, it may well be that incorporation of TiO 2 nanoparticles reduces cell stability, when there is intrusion of oxygen and water [58], which again may be counteracted to some extent by the inclusion of radical scavengers [59].…”

Section: Extension Of Service Lifementioning

confidence: 86%

Design issues for improved environmental performance of dye-sensitized and organic nanoparticulate solar cells

Reijnders

2010

Journal of Cleaner Production

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Link to publication Citation for published version (APA):Reijnders, L. (2010). Design issues for improved environmental performance of dye-sensitized and organic nanoparticulate solar cells. Journal of cleaner production, 18(4), 307-312. DOI: 10.1016/j.jclepro.2009.10.021 General rightsIt is not permitted to download or to forward/distribute the text or part of it without the consent of the author(s) and/or copyright holder(s), other than for strictly personal, individual use, unless the work is under an open content license (like Creative Commons). Disclaimer/Complaints regulationsIf you believe that digital publication of certain material infringes any of your rights or (privacy) interests, please let the Library know, stating your reasons. In case of a legitimate complaint, the Library will make the material inaccessible and/or remove it from the website. Please Ask the Library: http://uba.uva.nl/en/contact, or a letter to: Library of the University of Amsterdam, Secretariat, Singel 425, 1012 WP Amsterdam, The Netherlands. You will be contacted as soon as possible. a b s t r a c tThough environmental improvement has been claimed for the application of nanotechnology to solar cells, several characteristics of the fullerene-based organic, and the dye-sensitized nanoparticulate, solar cell are not conducive to such improvement. These include relatively high energy and materials inputs in the production of nanoparticles, a relatively low solar radiation to electricity conversion efficiency, a relatively short service life, the use of relatively scarce metals and relatively poor recyclability, if compared with the multicrystalline Si solar cell which currently is the market leader. Moreover, the lack of data and the inability of current methods to handle hazards of nanoparticles generate problems in conducting comparative life cycle assessment of nanoparticulate solar cells. So far, the claimed environmental advantage can not be substantiated for fullerene-based and dye-sensitized nanoparticulate solar cells. There are options for the environmental improvement of these nanoparticulate solar cells, but actual development does not seem to focus on environmental improvement.

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“…In the latter type of materials, the CTC band is so intense that it could enhance the solar energy harvesting in the bandgap of both the donor and acceptor [2], similarly to push-pull copolymers [3]. Furthermore, the polymer photoxidation stability is drastically increased by the presence of the CTCs [4]. As was recognized in early studies of small-molecule CTCs [5], the acceptor electron affinity is a key parameter that determines the back electron transfer rates.…”

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confidence: 99%

Acceptor Energy Offset Manages Ultrafast Recombination Dynamics in Donor-Acceptor Mixtures

Pavelyev

Parashchuk

Orekhova

et al. 2013

EPJ Web of Conferences

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Abstract.We study charge recombination rates in blends of MEH-PPV and a comprehensive set of low molecular-weight fluorine-based acceptors, using visiblepump -IR-probe photoinduced absorption technique. The positions of acceptor's HOMO-LUMO levels are engineered by addition of different chemical substituents. The results clearly show the exponential scaling of the charge recombination rate with the acceptor LUMO energy. The minimal donor-acceptor LUMO energy difference required to form a CTC state is estimated as ~0.25 eV.Ground-state charge transfer complexes (CTCs) lay in heart of many photoinduced processes in physics, chemistry, and biology. The ground-state CTCs are characterized by a partial shift of electronic density from the donor to the acceptor molecule already in the ground state. Upon optical excitation, the electron is transferred to the acceptor almost instantaneously, while back recombination occurs in the finite time. The CTC photophysical properties strongly depend on the molecular structure of the donor-acceptor pair. For instance, in polymer-fullerene blends the CTC absorption is extremely weak and hardly detectable [1]. In contrast, in blends of soluble poly-paraphenylene vinylenes (MEH-PPV) with fluorene-type acceptors, the CTC formation can be readily detected visually as a color change. In the latter type of materials, the CTC band is so intense that it could enhance the solar energy harvesting in the bandgap of both the donor and acceptor [2], similarly to push-pull copolymers [3]. Furthermore, the polymer photoxidation stability is drastically increased by the presence of the CTCs [4]. As was recognized in early studies of small-molecule CTCs [5], the acceptor electron affinity is a key parameter that determines the back electron transfer rates.Here we demonstrate that the acceptor electron affinity governs the CTC recombination rate in full accord with the Markus theory [6]. Donor-acceptor CTCs formed in blends between the conjugated polymer MEH-PPV and a family of low-molecular weight fluorene acceptors was used for their known property to form stable CTCs already in solution. To unravel recombination dynamics of the photogenerated charges, ultrafast visible-pump --IR-probe photo-induced absorption (PIA) spectroscopy [7] was applied. EPJ Web of Conferences

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Dramatic enhancement of photo-oxidation stability of a conjugated polymer in blends with organic acceptor

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Cited by 28 publications

References 26 publications

Enhanced Photostability and Red‐NIR Photosensitivity of Conjugated Polymer Charge‐Transfer Complexes

Enhanced Photostability and Red‐NIR Photosensitivity of Conjugated Polymer Charge‐Transfer Complexes

Design issues for improved environmental performance of dye-sensitized and organic nanoparticulate solar cells

Acceptor Energy Offset Manages Ultrafast Recombination Dynamics in Donor-Acceptor Mixtures

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