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Time-of-flight study of electrical charge mobilities in liquid-crystalline zinc octakis(β-octoxyethyl) porphyrin films

Published online by Cambridge University Press:  31 January 2011

Yang Yuan ,
Brian A. Gregg  and
Marcus F. Lawrence
Yang Yuan
Affiliation:
Department of Chemistry and Biochemistry, Concordia University, 1455 de Maisonneuve W., Montreal, Quebec, Canada H3G 1M8
Brian A. Gregg
Affiliation:
National Renewable Energy Laboratory, Basic Sciences Division, 1617 Cole Boulevard, Colden, Colorado 80401-3393
Marcus F. Lawrence*
Affiliation:
Department of Chemistry and Biochemistry, Concordia University, 1455 de Maisonneuve W., Montreal, Quebec, Canada H3G 1M8
*
a)Address all correspondence to this author. e-mail: lawrence@vax2.concordia.ca
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Abstract

Time-of-flight measurements performed on micron-thick films of liquid-crystalline zinc octakis(β-octoxyethyl) porphyrin indicated that charge carriers possess significantly high drift mobilities, attaining approximately 0.01 cm2 V−1s −1 and 0.008 cm2 V−1s −1 for holes and electrons, respectively, at room temperature. Upon heating the samples from 300 to 420 K, causing the porphyrin to go from the solid-crystalline to the discotic mesophase, the mobilities did not decrease drastically, and remained at values slightly larger than half those observed at room temperature. Charge transport in this material conformed to the Scher–Montroll model, which attributes a distribution of hopping times to the propagation of the initially formed charged carrier packet. Analysis of the “universal” plots prescribed by this model yielded a dispersion factor of 0.5 for both charge carriers.

Type
Articles
Information
Journal of Materials Research , Volume 15 , Issue 11 , November 2000 , pp. 2494 - 2498
Copyright
Copyright © Materials Research Society 2000

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