Switching in Poly-N-vinylcarbazole Thin Films Effect of Molecular Weight and Impurities

Abstract

ABSTRACT:In order to elucidate the trapping sites which serve an important role in the switching of poly-N-vinylcarbazole (PVCz), the effects of the molecular weight and the method of polymerization on the threshold voltage of switching was studied. The trap density was also determined from the threshold voltage. Polymerization was initiated by ()(,1)('-azobisisobutyronitrile (AIBN) or y-ray irradiation. The trap density was larger for lower molecular weight PVCz than for higher molecular weight materials. PVCz prepared by AIBN initiator had a trap density larger than that made by y-ray initiation when both polymers had the same molecular weight. Doping of iodine onto PVCz increased the trap density; however, doping of tetramethyl-p-phenylenediamine or 1,5-diaminonaphthalene had no such effect. Heat treatment ofPVCz seemed to have some effect on the switching characteristics.KEY WORDS Poly-N-vinylcarbazole

Switching in Poly(N-vinylcarbazole) Thin Films: Effect of γ-Ray Irradiation and Heat Treatment

“…The apparatus for switching measurements and the method for film thickness determination were the same as described in preceding paper. 2 Heat treatment effects were examined by heating and then cooling the sample gradually to room temperature in a temperature-controlled furnace. …”

Συνθεση Και Χαρακτηρισμος Συμπολυμερων Του Ν-Βινυλοκαρβαζολιου Και (Μεθ) Ακρυλικων Αλκυλαμινοεστερων

“…Παρατηρείται μεταφορά φορέων θετικών φορτίων (οπών) και όχι φορέων αρνητικών φορτίων (ηλεκτρονίων). Η ευκινησία μ (mobility) των φορέων εξαρτάται από την ένταση του ηλεκτρικού πεδίου, τη θερμοκρασία, το μοριακό βάρος και την παρουσία προσθέτων [80,81].…”