The pulse-photoconductivity of poly(N-vinylbenzocarbazole)s.
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概要
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The hole-drift mobility and the carrier-photogeneration efficiency of holes in poly(5-vinylbenzo[<I>b</I>]carbazole)(P5VBCz) and poly(7-vinylbenzo[<I>c</I>]carbazole)(P7VBCz) films were investigated by means of the time-offlight method and compared with those in poly (<I>N</I>-vinylcarbazole)(PVCz) films. The mobilities of these polymers were nearly equal to each other and smaller than that of PVCz by a factor of <I>ca.</I> 1/3. The electric field and temperature dependence of the mobilities fit Gill's empirical equation. The small mobilities of both P5VBCz and P7VBCz were apparently attributable to the small values of the pre-exponential factor, μ<SUB>0</SUB>. The carrier-photogeneration efficiencies, φ, of these polymers were larger than that of PVCz by a factor of <I>ca.</I> 10. The field dependence of φ of these polymers for the excitation of the <SUP>1</SUP>B<SUB>a</SUB> absorption band was in good agreement with the Onsager theory of geminate recombination. These results indicate that the introduction of bulky and unsymmetric benzocarbazolyl chromophores instead of carbazolyl ones as a pendant group of vinyl polymers is a good modification from the point of view of the carrier-photogeneration, but not from the viewpoint of the carrier transport.
- 公益社団法人 日本化学会の論文
著者
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Okamoto Ken-ichi
Department Of Advanced Materials Science & Engineering Faculty Of Engineering Yamaguchi Universi
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Kusabayashi Shigekazu
Department of Applied Chemistry, Faculty of Engineering, Osaka University
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Itaya Akira
Department of Chemical Engineering, Faculty of Engineering, Yamaguchi University
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Okamoto Ken-ichi
Department of Chemical Engineering, Faculty of Engineering, Yamaguchi University
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