Abstract
The photogeneration process in thin films of vacuum-evaporated amorphous 2,4,7-trinitro-9-fluorenone(a-TNF) is investigated by steady-state photoconductivity measurements and by thephotoinduced discharge method. It was found that in the intrinsic spectral range of absorption(λ≤400 nm) the charge carrier photogeneration mechanism includes several steps. The final step,thermal dissociation of light generated electron–hole pairs, is realized according to theOnsager mechanism. The effect of trapping centers on the conductivity of thin filmsof a-TNF is investigated by space charge limited current (SCLC), steady-statephotoconductivity, and transient photoconductivity methods. It is suggested that thetransport of charge carriers in a-TNF is controlled by traps.
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