Frequency-dependent photothermal measurement of thermal diffusivity for opaque and non-opaque materials: Application to crystals of TIPS-pentacene

Maryam Shahi; J. W. Brill

doi:10.1063/1.5050189

Frequency-dependent photothermal measurement of thermal diffusivity for opaque and non-opaque materials: Application to crystals of TIPS-pentacene

Maryam Shahi, J. W. Brill

Physics And Astronomy

Research output: Contribution to journal › Article › peer-review

4 Scopus citations

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.

Original language	English
Article number	155104
Journal	Journal of Applied Physics
Volume	124
Issue number	15
DOIs	https://doi.org/10.1063/1.5050189
State	Published - Oct 21 2018

Bibliographical note

Funding Information:
We thank Z. Li, J. Edberg, F. Zhang, and X. Crispin (Linkoping U.) for providing samples of NFC-PEDOT and PEDOT:PSS, M. M. Payne and J. E. Anthony (U. Kentucky) for both providing samples of TIPS-pentacene and helpful suggestions in preparing new crystals, and Y. Yao and M. Weisenberger (U. Kentucky) for helpful discussions on techniques. This research was supported by the National Science Foundation (NSF) (Grant No. DMR-1262261).

Publisher Copyright:
© 2018 Author(s).

ASJC Scopus subject areas

Physics and Astronomy (all)

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title = "Frequency-dependent photothermal measurement of thermal diffusivity for opaque and non-opaque materials: Application to crystals of TIPS-pentacene",

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.",

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note = "Funding Information: We thank Z. Li, J. Edberg, F. Zhang, and X. Crispin (Linkoping U.) for providing samples of NFC-PEDOT and PEDOT:PSS, M. M. Payne and J. E. Anthony (U. Kentucky) for both providing samples of TIPS-pentacene and helpful suggestions in preparing new crystals, and Y. Yao and M. Weisenberger (U. Kentucky) for helpful discussions on techniques. This research was supported by the National Science Foundation (NSF) (Grant No. DMR-1262261). Publisher Copyright: {\textcopyright} 2018 Author(s).",

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N2 - 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.

AB - 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.

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Frequency-dependent photothermal measurement of thermal diffusivity for opaque and non-opaque materials: Application to crystals of TIPS-pentacene

Abstract

Bibliographical note

ASJC Scopus subject areas

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