Kobus O. The relaxation of photoprocesses in organic semiconductor films sensibilized by fullerens.

The relaxation of photophysical properties of amorphous semiconductors polymers of poli-N-vinilcrbazol (PVC) and poli-N-epoxipropilcarbazol (PEPC) with doped by fullerenes С60 is investigated in this work including effects of high-energy electron irradiation. The mechanisms of sensibilization electronhole pair photogeneration and electron excitation in these nanocomposites are founded. Experimental investigation of crystal structure, optical conductivity, fields dependences of photoflow and infrared absorption of amorphous semiconducting films PVC and PEPC with various content of doping fullerenes synthesized by watering and sputtering methods are carried out. Calculation of fields dependences of thermalization length and spectral dependence of quantum yield of charge carriers photogeneration by theoretical model that takes into account interaction of exciton states with environment. It is shown that formation of intermolecular (CCT) take place into nanocomposites. Presence of its lead to change of these dependences spectra. The presence of such complex accompanied by formation additional optical absorption in wide wavelength range, change of intensity of single bands of infrared absorption for mode fullerene vibration and reconstruction of photoluminescence and optical conductivity spectra. Fullerene aggregation is observed with grows of concentration and according appearance of photoluminescence bands which inherent singlet state of С60 molecules. Irradiation of nanocomposites by high-energy particles difficulty effects on the relaxation of energy excitation mechanism with molecular complexes. Segregation and formation the great quantity of radiation damaged fullerenes and this lead to decrease of number formatted molecular complexes. On the other hand, increase of fullerene number is observed in which translation from singlet state to triplet state is observed. It promote a possibility of following grows of molecular complexes concentration. The calculation of thermalization characteristic for pentacenecrystal and organic semiconductor is good agreement with theoretical approximation, which anticipates interaction exciton states with environment molecules.