Hydrostatic-pressure dependence of the photoconductivity of single-crystal pentacene and tetracene

Zhenlin Rang, Anders Haraldsson, Dong M. Kim, P. Paul Ruden, Marshall I. Nathan, Reid J. Chesterfield, C. Daniel Frisbie

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Abstract

Pentacene and tetracene show readily observable photoconductivity when illuminated with light in the blue part of the visible spectrum. We measured the change of photoconductivity with hydrostatic pressure in single-crystal samples of both materials. Possible mechanisms for the observed increase in photoconductivity with pressure are discussed. We conclude that a carrier-mobility increase under pressure is most likely to cause the increase in photoconductivity in the case of pentacene. For tetracene, changes in the absorption spectrum in the range of the excitation wavelengths may also be significant. We also observe a phase transition near 0.3 GPa in tetracene, in agreement with previous results.

Original languageEnglish (US)
Pages (from-to)2731-2733
Number of pages3
JournalApplied Physics Letters
Volume79
Issue number17
DOIs
StatePublished - Oct 22 2001

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