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Photoelectronic properties of iodine‐incorporated poly( N ‐vinylcarbazole) films
Author(s) -
Hu J.,
Kao K. C.
Publication year - 1991
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1991.070430907
Subject(s) - iodine , photoconductivity , materials science , carbazole , charge carrier , conductivity , photochemistry , chemical vapor deposition , analytical chemistry (journal) , chemical engineering , chemistry , optoelectronics , organic chemistry , engineering , metallurgy
Iodine was incorporated into poly( N ‐vinylcarbazole) (PVK) films by exposing the films to saturated iodine vapor at 100°C for 10 h. The content of iodine in the films was 2.3% by weight. The films were stable at room temperature. The infrared spectra indicate that no chemical reaction has taken place during the incorporation process. The dark conductivity of these films is about two orders of magnitude greater than that of pure PVK films. Carriers can be photogenerated in the films by light illumination from the UV region to the entire visible region. The most significant feature of these films is that the photoconductivity has a peak at the photon energy of 1.8eV. This is attributed to the charge transfer from the carbazole to I 2 . The results of thermally stimulated currents (TSC) indicate that there are deep traps in pure PVK films, but after iodine incorporation, these deep traps disappear or are replaced by a large quantity of shallow traps.