Light-induced EPR study of charge transfer in poly(3-hexylthiophene)/fullerene bulk heterojunction

Krinichnyi, V I; Yudanova, E I; Denisov, N N

doi:10.1063/1.3193722

Title: Light-induced EPR study of charge transfer in poly(3-hexylthiophene)/fullerene bulk heterojunction

Full Record
Other Related Research

Abstract

The first results of the light-induced EPR study of magnetic, relaxation, and dynamic parameters of charge carriers background photoinduced by optical photons (1.7-3.4 eV) in poly(3-hexylthiophene)/fullerene bulk heterojunctions are described. All magnetic resonance parameters for positively charged polaron and negatively charged fullerene ion-radical in radical pairs photoinduced in the composite were determined separately by the steady-state microwave saturation method. Paramagnetic susceptibility of charge carriers reflects their activation dynamics and exchange interaction. A decay of long-living radical pairs depends on the spatial distance between photoinduced charge carriers. The one-dimensional polaron diffusion along the polymer chain and fullerene rotation near the main molecular axis was shown to follow activation Elliot hopping model and to be governed by photon energy. The difference in activation energies of the charge carriers' dynamics and in their dependence on the exciting photon energy proves their noninteracting character in the polymer/fullerene composite. Main magnetic, relaxation and dynamics parameters of charge carriers are governed by the photon energy band due to inhomogeneity of distribution of polymer and fullerene domains in the composite.

Authors:

Krinichnyi, V I; Yudanova, E I; Denisov, N N ^[1]

Institute of Problems of Chemical Physics, RAS, Semenov Avenue 1, Chernogolovka 142432 (Russian Federation)

Publication Date:: Tue Jul 28 00:00:00 EDT 2009

OSTI Identifier:: 21559755

Resource Type:: Journal Article

Journal Name:: Journal of Chemical Physics

Additional Journal Information:: Journal Volume: 131; Journal Issue: 4; Other Information: DOI: 10.1063/1.3193722; (c) 2009 American Institute of Physics; Journal ID: ISSN 0021-9606

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 36 MATERIALS SCIENCE; 71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ACTIVATION ENERGY; CHARGE CARRIERS; CHARGE EXCHANGE; ELECTRON SPIN RESONANCE; ELECTRONS; EXCHANGE INTERACTIONS; FULLERENES; HETEROJUNCTIONS; MAGNETIC SUSCEPTIBILITY; MICROWAVE RADIATION; ONE-DIMENSIONAL CALCULATIONS; PARAMAGNETISM; PHOTONS; POLARONS; POLYMERS; RELAXATION; SATURATION; STEADY-STATE CONDITIONS; BOSONS; CARBON; ELECTROMAGNETIC RADIATION; ELEMENTARY PARTICLES; ELEMENTS; ENERGY; FERMIONS; INTERACTIONS; LEPTONS; MAGNETIC PROPERTIES; MAGNETIC RESONANCE; MAGNETISM; MASSLESS PARTICLES; NONMETALS; PHYSICAL PROPERTIES; QUASI PARTICLES; RADIATIONS; RESONANCE; SEMICONDUCTOR JUNCTIONS

Citation Formats


                    Krinichnyi, V I, Yudanova, E I, and Denisov, N N. Light-induced EPR study of charge transfer in poly(3-hexylthiophene)/fullerene bulk heterojunction.  United States: N. p., 2009. 
        Web.  doi:10.1063/1.3193722.

Copy to clipboard


                    Krinichnyi, V I, Yudanova, E I, & Denisov, N N. Light-induced EPR study of charge transfer in poly(3-hexylthiophene)/fullerene bulk heterojunction.  United States.  https://doi.org/10.1063/1.3193722

Copy to clipboard


                    Krinichnyi, V I, Yudanova, E I, and Denisov, N N. 2009.  
        "Light-induced EPR study of charge transfer in poly(3-hexylthiophene)/fullerene bulk heterojunction".  United States.  https://doi.org/10.1063/1.3193722.

Copy to clipboard


                    
@article{osti_21559755,

  title        = {Light-induced EPR study of charge transfer in poly(3-hexylthiophene)/fullerene bulk heterojunction},

  author       = {Krinichnyi, V I and Yudanova, E I and Denisov, N N},

  abstractNote = {The first results of the light-induced EPR study of magnetic, relaxation, and dynamic parameters of charge carriers background photoinduced by optical photons (1.7-3.4 eV) in poly(3-hexylthiophene)/fullerene bulk heterojunctions are described. All magnetic resonance parameters for positively charged polaron and negatively charged fullerene ion-radical in radical pairs photoinduced in the composite were determined separately by the steady-state microwave saturation method. Paramagnetic susceptibility of charge carriers reflects their activation dynamics and exchange interaction. A decay of long-living radical pairs depends on the spatial distance between photoinduced charge carriers. The one-dimensional polaron diffusion along the polymer chain and fullerene rotation near the main molecular axis was shown to follow activation Elliot hopping model and to be governed by photon energy. The difference in activation energies of the charge carriers' dynamics and in their dependence on the exciting photon energy proves their noninteracting character in the polymer/fullerene composite. Main magnetic, relaxation and dynamics parameters of charge carriers are governed by the photon energy band due to inhomogeneity of distribution of polymer and fullerene domains in the composite.},

  doi          = {10.1063/1.3193722},

  url          = {https://www.osti.gov/biblio/21559755},
  journal      = {Journal of Chemical Physics},

  issn         = {0021-9606},

  number       = 4,

  volume       = 131,

  place        = {United States},

  year         = {Tue Jul 28 00:00:00 EDT 2009},

  month        = {Tue Jul 28 00:00:00 EDT 2009}

}

Copy to clipboard

Journal Article:

https://doi.org/10.1063/1.3193722

Other availability

Find in Google Scholar

Search WorldCat to find libraries that may hold this journal

Save / Share:

Export Metadata

Save to My Library

Similar records in OSTI.GOV collections:

The role of spin exchange in charge transfer in low-bandgap polymer: Fullerene bulk heterojunctions

Journal Article Yudanova, E.; Denisov, N. - Journal of Chemical Physics

Formation, relaxation and dynamics of polarons and methanofullerene anion radicals photoinitiated in poly[N-9″-hepta-decanyl-2,7-carbazole-alt-5,5-(4′,7′-di-2-thienyl-2′,1′, 3′-benzothiadiazole)]:-[6,6]-phenyl-C{sub 61}-butyric acid methyl ester (PCDTBT:PC{sub 61}BM) bulk heterojunctions were studied mainly by light-induced EPR (LEPR) spectroscopy in wide photon energy and temperature ranges. Some polarons are pinned by spin traps whose number and depth are governed by the composite morphology and photon energy. The proximity of the photon energy and the polymer bandgap reduces the number of such traps, inhibits recombination of mobile charge carriers, and facilitates their mobility in polymer network. Spin relaxation and charge carrier dynamics were studied by the steady-state saturation method atmore »« less
https://doi.org/10.1063/1.4890995
Photoinduced Charge Carrier Generation in a Poly(3-hexylthiophene) and Methanofullerene Bulk Heterojunction Investigated by Time-Resolved Terahertz Spectroscopy

Journal Article Ai, Xin; Beard, Matthew; Knutsen, Kelly; ... - Journal of Physical Chemistry B: Materials, Surfaces, Interfaces, amp Biophysical

We report on the ultrafast photoinduced charge separation processes in varying compositions of poly(3-hexylthiophene) (P3HT) blended with the electron acceptor [6,6]-phenyl-C61-butyric acid methyl ester (PCBM). Through the use of time-resolved terahertz spectroscopy, the time- and frequency-dependent complex photoconductivity is measured for samples with PCBM weight fractions (WPCBM) of 0, 0.2, 0.5, and 0.8. By analysis of the frequency-dependent complex conductivity, both the charge carrier yield and the average charge carrier mobility have been determined analytically and indicate a short (<0.2 nm) carrier mean free path and a suppressed long-range transport that is characteristic of carrier localization. Studies on pure filmsmore »« less
https://doi.org/10.1021/jp065212i
Spin signatures of photogenerated radical anions in polymer-[70] fullerene bulk-heterojunctions : high-frequency pulsed EPR spectroscopy.

Journal Article Poluektov, O; Filippone, S; Martin, N; ... - Journal of Physical Chemistry B

Charged polarons in thin films of polymer-fullerene composites are investigated by light-induced electron paramagnetic resonance (EPR) at 9.5 GHz (X-band) and 130 GHz (D-band). The materials studied were poly(3-hexylthiophene) (PHT), [6,6]-phenyl-C61-butyric acid methyl ester (C{sub 60}-PCBM), and two different soluble C{sub 70}-derivates: C{sub 70}-PCBM and diphenylmethano[70]fullerene oligoether (C{sub 70}-DPM-OE). The first experimental identification of the negative polaron localized on the C{sub 70}-cage in polymer-fullerene bulk heterojunctions has been obtained. When recorded at conventional X-band EPR, this signal is overlapping with the signal of the positive polaron, which does not allow for its direct experimental identification. Owing to the superior spectralmore »« less
https://doi.org/10.1021/jp1012347
Spin signatures of photogenerated radical anions in polymer-[70]fullerene bulk-heterojunctions : high-frequency pulsed EPR spectroscopy.

Journal Article Poluektov, O; Filippone, S; Martin, N; ... - J. Phys. Chem. B

Charged polarons in thin films of polymer-fullerene composites are investigated by light-induced electron paramagnetic resonance (EPR) at 9.5 GHz (X-band) and 130 GHz (D-band). The materials studied were poly(3-hexylthiophene) (PHT), [6,6]-phenyl-C61-butyric acid methyl ester (C{sub 60}-PCBM), and two different soluble C{sub 70}-derivates: C{sub 70}-PCBM and diphenylmethano[70]fullerene oligoether (C{sub 70}-DPM-OE). The first experimental identification of the negative polaron localized on the C{sub 70}-cage in polymer-fullerene bulk heterojunctions has been obtained. When recorded at conventional X-band EPR, this signal is overlapping with the signal of the positive polaron, which does not allow for its direct experimental identification. Owing to the superior spectralmore »« less
https://doi.org/10.1021/jp1012347
Photoinduced Charge Carrier Generation and Decay in Sequentially Deposited Polymer/Fullerene Layers: Bulk Heterojunction vs. Planar Interface

Journal Article Nardes, Alexandre; Ayzner, Alexander; Hammond, Scott; ... - Journal of Physical Chemistry. C

In this work, we use the time-resolved microwave conductivity (TRMC) technique to study the dynamics of charge carrier generation in sequentially deposited conjugated polymer/fullerene layers. These layers are either fully solution-processed, using orthogonal solvents for the layers of the polymer poly(3-hexylthiophene) (P3HT) and the fullerene phenyl-C{sup 61}-butyric acid methyl ester (PCBM), or prepared by thermally evaporating a C{sup 60} layer onto P3HT films. Our work is motivated by the remarkable efficiency of organic photovoltaic (OPV) devices using a sequentially processed P3HT/PCBM active layer. Here we use an electrodeless photoconductivity probe, so we can photoexcite the sample either through the polymermore »« less
https://doi.org/10.1021/jp212390p

Similar Records