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Dispersive charge transport due to strong charge-dipole interactions of cyano-group in the cyano-carbazole based molecular glass

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Title
Dispersive charge transport due to strong charge-dipole interactions of cyano-group in the cyano-carbazole based molecular glass
Author
Oh, DKHong, SMLee, CEKim, BSJin, JI
Keywords
A. Organic glasses;  A. Disordered system;  D. Electronic transport;  D. Recombination and trapping
Issue Date
200512
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
Citation
SOLID STATE COMMUNICATIONS, v.136, no.11-12, pp.585 - 590
Abstract
Using the time of flight (ToF) method, we investigated the bipolar charge transport for two glass-forming molecules containing carbazole and cyano-carbazole moiety. The enhanced electron mobility was observed in the cyano-carbazole compound. From the numerical method based the Laplace formalism, the distribution of hole trapping energy was obtained for the carbazole compound. This result was compared with the exponential distribution extracted from dispersion parameter for the cyano-carbazole material. Considering charge-dipole interactions as a reason for the disordered trapping mechanism, we discussed dispersive charge transport induced by a strong dipolar (i.e. cyano) group by comparing the distributions of hole trapping sites for two compounds. (c) 2005 Elsevier Ltd. All rights reserved
URI
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DOI
http://dx.doi.org/10.1016/j.ssc.2005.09.030
ISSN
0038-1098
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SNS_Journal Papers
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