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LEPR spectroscopy of charge carriers photoinduced in polymer/fullerene composites pp.417-446 $100.00
Authors:  (V.I. Krinichnyi, Institute of Problems of Chemical Physics RAS, Russia)
Abstract:
Composites of conjugated polymers with fullerenes are perspective materials for
plastic photovoltaics. In the present Chapter, the Light-Induced EPR (LEPR) study of
magnetic, relaxation and dynamic parameters of polaron-fullerene radical pairs
photoinduced in bulk heterojunction of various polymer/fullerene composites is
described. Weak interaction of positively charged polarons and negatively charged
fullerene anion radicals in these radical pairs was shown to stipulate by a difference
interaction of charge carriers with own microenvironment. Paramagnetic susceptibility of
these radicals reflects their activation dynamics and exchange interaction in the
polymer/fullerene system. A decay of long-living spin pairs depends on the spatial
distance between photoinduced charge carriers and on the energy of exciting photons.
Microwave steady-state saturation method allowed to determine separately all relaxation
and dynamics parameters for both type of charge carriers. 1D polaron diffusion along a
polymer chain and fullerene pseudorotation near own main molecular axis was shown to
follow activation Elliot hopping model and to be governed by photon energy. The energy
required for activation of polaron diffusion differs from that of fullerene pseudorotation
that proves a noninteracting character of charge carriers photoinduced in
polymer/fullerene composites. Main magnetic, relaxation and dynamics parameters of
these charge carriers are governed by the photon energy due inhomogeneity of
distribution of polymer and fullerene domains in the composite. 


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LEPR spectroscopy of charge carriers photoinduced in polymer/fullerene composites pp.417-446