  The thesis focuses on study of optical and photovoltaic properties of
iso-type and aniso-type heterostructures based on photosensitive layers of
organic semiconductors. The primary attention has been paid on determination of
optimal conditions for preparation of organic thin-film structures of methyl
substituted perylene pigment, hexathiopentacene and SnCl2 phthalocyanine. These
structures are perspective for fabrication of photosensitive heterostructures
and can be used for development of effective photoconverters of solar energy.
The influence of annealing and substrate temperature during thermal deposition
of the films on morphology and surface structure, optical and photovoltaic
properties of thin films of methyl substituted perylene pigment,
hexathiopentacene and SnCl2 phthalocyanine was studied. The surface and bulk
parameters of considered films were determined from the results obtained here.
The photovoltaic and optical properties of organic iso-type and aniso-type
heterostructures prepared on the substrates with different temperatures were
studied. The obtained data for heterostructures were analyzed using Anderson
model and Van Opdorp model, respectively. This analysis showed that organic
aniso-type heterostructures based on methyl substituted perylene pigment and
iso-type heterostructures based on pentacene can be described by the models
proposed and developed for inorganic semiconductor heterojunctions. The optimal
conditions were determined for preparation of organic photosensitive
heterostructures, which absorb most part of solar radiation in visible and near
infrared range, as well as effectively generate and separate charge carriers on
the interface of heterojunction. The aniso-type and iso-type heterostructures
prepared under optimal conditions are perspective elements for development of
organic photoconverters, including organic solar cells.

Materials Science