  Possible conformations of the thioderivatives of pentacene (Pn) have been
considered. The absorption spectra of polythiopentacene (PTPn) solutions and
films have been studied. PTPn is revealed to be a mixture of Pn thioderivatives
with different numbers of S atoms. After this mixture having been condensed in
vacuum onto quartz substrates, its main components are tetrathiopentacene
(TTPn) and hexathiopentacene (HTPn). The position of the maximum in the
long-wave absorption bands of Pn thioderivatives is a linear function of the
number of valence electrons in S atoms, which take part in the conjugation with
the {\pi}-system of the pentacene frame of PTPn molecules. The analysis of the
photocurrent and capacitor photovoltage (CPV) spectra in the range of the first
electron transitions in PTPn has shown that the photoconductivity is of the
hole type and is caused by the dissociation of excitons at the electron capture
centers. The frontal CPV is caused by the Dember photovoltage ({\phi}D), and
the back one by the surface-barrier photovoltage ({\phi}b).
