Articles you may be interested inPicosecond degenerate fourwave mixing study of nonlinear optical properties of the polyNvinyl carbazole: 2,4,7 trinitrofluorenone composite polymer photoconductor J. Chem. Phys. 90, 5078 (1989); 10.1063/1.456549Bulk recombination of charge carriers in polymer films: PolyNvinylcarbazole complexed with trinitrofluorenoneThe photoinjection of electrons and holes from a sensitizing layer of amorphous selenium into films of the poly(N -vinyl carbazole): trinitrofluorenone, PVK : TNF, charge-transfer complex has been studied by means of xerographic discharge techniques. The observed discharges are interpreted as being space-charge limited and thus allow a determination of the carrier mobilities as a function of TNF loading. The mobilities determined in this way are consistent with measurements reported which used the time-of-flight technique. The asymmetries of discharge observed depending on whether electrons or holes are injected from the selenium are thus associated with mobility limitations and not to significant energy barriers between the transport states in amorphous selenium and PVK : TNF. An upper limit can therefore be inferred for the separation between the transport states for electrons and holes in this charge-transfer complex.
The photoinjection of electrons from a sensitizing layer of amorphous selenium into thin films of trinitrofluorenone (TNF) has been studied using the xerographic discharge technique. Discharge curves were observed for both the amorphous and crystalline state of TNF. Large changes in discharge characteristics observed for the two states of the material are correlated with changes in electron transport. The effective mobility determined from the xerographic measurements for the amorphous TNF structure is field dependent and has a value of 6X 10-5 cm 2 /V sec at 4x 10 5 V /cm. This value is consistent with those obtained using the conventional time-of-flight measurement technique. A lower limit of electron mobility in polycrystalline TNF may be inferred from these measurements.
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