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

Journal Article · Tue Jul 28 00:00:00 EDT 2009 · Journal of Chemical Physics

DOI:https://doi.org/10.1063/1.3193722· OSTI ID:21559755

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

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

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.

• OSTI ID: 21559755
• Journal Information: Journal of Chemical Physics, Vol. 131, Issue 4; Other Information: DOI: 10.1063/1.3193722; (c) 2009 American Institute of Physics; ISSN 0021-9606
• Country of Publication: United States
• Language: English

Related Subjects

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