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Kim, BongSoo
Polymer & Organic Semiconductor Lab.
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Dispersive charge transport due to strong charge-dipole interactions of cyano-group in the cyano-carbazole based molecular glass

Author(s)
Oh, DKHong, SMLee, CEKim, BSJin, JI
Issued Date
2005-12
DOI
10.1016/j.ssc.2005.09.030
URI
https://scholarworks.unist.ac.kr/handle/201301/24844
Fulltext
https://www.sciencedirect.com/science/article/pii/S0038109805008082?via%3Dihub
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
Publisher
PERGAMON-ELSEVIER SCIENCE LTD
ISSN
0038-1098
Keyword (Author)
organic glassesdisordered systemelectronic transportrecombination and trapping
Keyword
LOCALIZED-STATE DISTRIBUTIONSLIGHT-EMITTING-DIODESHIGH-ELECTRON-MOBILITYDOPED POLYMERSTRANSIENT PHOTOCONDUCTIVITYORGANIC MATERIALSHOPPING MOBILITYELECTROLUMINESCENCESEMICONDUCTORSDEPENDENCE

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