The photoelectric characteristics of the newly synthesized polyimides PI are investigated by using the electrophotographic method. A novel conjugated polymers, polyimides based on N,N’,N”,N”’-substituted paraphenylenediamine and dianhydrides of aromatic tetracarboxylic acids, was prepared via Suzuki coupling reaction. The polymer exhibits excellent solubility in common organic solvent, and has high thermal stability such as T d10 at 453 0C in nitrogen atmosphere and T g at about 140 0C. The photoelectric sensitivity of the PI films (3 m thickness) is observed in the UV, and visible spectral regions, due to the interactions with charge transfer between donor and acceptor fragments of the PI chains (formation of charge transfer complex, CTC). Study of the photogeneration quantum yield field dependence gives the evidence that the photogeneration mechanism is a field assisted thermo-dissociation of radical ion pairs kinetically associated with the excited CTC. The second important mechanism of photogeneration is photostimulation of long-lived stable cation-radicals of the donor PI fragments, representing the hole (major carriers) captured by deep centers (photostimulated currents). Accumulation of the cation-radicals in the dark and photoprocesses leads to the dependence of photovoltaic characteristics on the number of charge-discharge cycles of the sample.
electrophotographic method, polyimides, Suzuki coupling reaction, photoelectric characteristics, photoelectric sensitivity, charge transfer complex, photogeneration quantum yield, photogeneration mechanism, cation-radical, anion-radical, photovoltaic characteristics, электрофотографический метод, полиимиды, реакция сочетания Сузуки, фотоэлектрические характеристики, фотоэлектрическая чувствительность, комплексный перенос заряда, фотогенерация квантовый выход, механизм фотогенерации, катион-радикальные, анион-радикальные, фотоэлектрические характеристики
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