Unusual photoelectric properties of polymeric composites containing heteropolynuclear complexes of transition metals

摘要

Composites based on acrylonitrilebutadienestyrene and poly-N-epoxypropylcarbazole doped with heteropolynuclear copper complexes were synthesized. The electric and photoconductive properties of films of these composites are studied. The absorption and internal photoelectric effect in the visible region of the spectrum are controlled by the d-d transitions of Cu (II) ions. Positive and anomalous negative photoconductivity effects were detected in films of these composites. Unusual photoelectric properties can be caused by nonequilibrium-carrier capture by deep traps near the boundaries of the associations of structurally different complexes. The negative photoconductivity effect is leveled, and film photosensitivity increases as an additional channel of excess hole transport is formed using poly-N-epoxypropylcarbazole. A phenomenological model of the photoconductivity kinetics that explains the experimental results, is suggested.