Abstract

We propose the use of a frequency-dependent photothermal measurement as a complement to light-flash, i.e., time-dependent, measurements to determine the through-plane thermal diffusivity of small, thin samples, e.g., semiconducting polymers and small organic molecule crystals. The analysis is extended from its previous use with some opaque conducting polymers to materials with finite absorption coefficients, such as crystals of 6,13-bis(triisopropylsilylethynyl)pentacene. Taking into account the finite absorption coefficients of the latter gives a value of diffusivity, D ≈ 0.10 mm2/s, much smaller than previously estimated and more consistent with its expected value. We also briefly discuss the effects of coating samples for the measurement to improve their optical properties.

Document Type

Article

Publication Date

10-17-2018

Notes/Citation Information

Published in Journal of Applied Physics, v. 124, issue 15, 155104, p. 1-6.

© 2018 Author(s)

This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing.

This article appeared in Journal of Applied Physics, v. 124, issue 15, 155104, p. 1-6 and may be found at https://doi.org/10.1063/1.5050189.

Digital Object Identifier (DOI)

https://doi.org/10.1063/1.5050189

Funding Information

This research was supported by the National Science Foundation (NSF) (Grant No. DMR-1262261).

Available for download on Thursday, October 17, 2019

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