Abstract
Thermal conductivity of rubrene single crystals is measured for both bulk and film-like crystals down to 0.5 K in order to estimate quantitatively density of crystalline defects through their phonon mean free paths. The temperature profile of the bulk rubrene crystals exhibit pronounced peak at ~ 10 K in the thermal conductivity as the result of very long mean-free paths of their phonons which indicates extremely low-level defect density in the region of 1015-1016 cm-3 depending on different growth methods. The crystals grown from gas phase tend to have less defects than those grown from solution. It turned out that the film-like crystals have a few times more defect density as the result of the measurement by using newly developed devices for minute crystals.
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Okada, Y., Uno, M. & Takeya, J. Low-Temperature Thermal Conductivity of Rubrene Single Crystals: Quantitative Estimation of Defect Density in Bulk and Film Crystals. MRS Online Proceedings Library 1154, 1059 (2008). https://doi.org/10.1557/PROC-1154-B10-59
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DOI: https://doi.org/10.1557/PROC-1154-B10-59