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.
Original language | English |
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Pages (from-to) | 585-590 |
Number of pages | 6 |
Journal | Solid State Communications |
Volume | 136 |
Issue number | 11-12 |
DOIs | |
Publication status | Published - 2005 Dec |
Bibliographical note
Funding Information:This work is supported by the Material Science Collaboration Research fund of KBSI, Research Foundation Grant for basic science support (KRF-2002-015-CP0125) and the Korea Science and Engineering Foundation through CRM of Korea University.
Keywords
- A. Disordered system
- A. Organic glasses
- D. Electronic transport
- D. Recombination and trapping
ASJC Scopus subject areas
- General Chemistry
- Condensed Matter Physics
- Materials Chemistry