Anisotropy of transient photoconductivity in functionalized pentacene single crystals

O. Ostroverkhova, D. G. Cooke, F. A. Hegmann, R. R. Tykwinski, S. R. Parkin, J. E. Anthony

Research output: Contribution to journalArticlepeer-review

84 Scopus citations

Abstract

We report on the anisotropy of transient photoconductivity in functionalized pentacene single crystals using ultrafast optical pump-terahertz probe techniques. Functionalized pentacene crystals with tri- isopropylsilylethynyl (TIPS) and tri-ethylsilylethynyl (TES) side groups were studied, characterized by crystal structures favoring two-dimensional and one-dimensional charge transports, respectively. Charge carrier mobility anisotropies in the a-b plane of 3.5±0.6 and 12±6 were obtained in the TIPS and TES crystals, respectively, consistent with the degree of π overlap along different directions in the crystals. A photogeneration efficiency anisotropy was also observed in both types of crystals.

Original languageEnglish
Article number192113
JournalApplied Physics Letters
Volume89
Issue number19
DOIs
StatePublished - 2006

Bibliographical note

Funding Information:
The authors thank V. Podzorov for helpful discussions. This work was supported by NSERC, CIPI, ONR, iCORE, and the Killam Trust.

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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