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Applied Physics Letters

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Hole mobilities (μ) in rubrene single crystals (space group Cmca) along the crystallographic c-axis have been investigated as a function of temperature and applied electric field by the time-of-fight method. Measurements demonstrate an inverse power law dependence on temperature, namely,μ=μ0T−n with n = 1.8, from room temperature down to 180 K. At 296 K, the average value of μ was found to be 0.29 cm2/Vs increasing to an average value of 0.70 cm2/Vs at 180 K. Below 180 K a decrease in mobility is observed with further cooling. Overall, these results confirm the anisotropic nature of transport in rubrene crystals as well as the generality of the inverse power law temperature dependence that is observed for field effect mobility measurements in the a-b crystal plane.


Copyright 2015 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics.

The article was published as:

Pundsack, Tom J. and Haugen, Neale O. and Johnstone, Lucas R. and Daniel Frisbie, C. and Lidberg, Russell L., (2015) "Temperature dependent c-axis hole mobilities in rubrene single crystals determined by time-of-flight" Applied Physics Letters, 106, 113301. DOI:10.1063/1.4914975.



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