Thermal behavior and polymorphism of 2,9-didecyldinaphtho[2,3-b:2′,3′-f]thieno[3,2-b]thiophene thin films

Felix Talnack, Sebastian Hutsch, Michael Bretschneider, Yulia Krupskaya, Bernd Büchner, Marc Malfois, Mike Hambsch, Frank Ortmann, Stefan C.B. Mannsfeld

Research output: Contribution to journalArticlepeer-review

10 Scopus citations

Abstract

The ability of numerous organic molecules to adopt different crystal structures without changing their chemical structure is called polymorphism which has gained interest in recent years due to the influence it has on the solid-state properties of organic materials, e.g. charge transport in organic semiconductors. Here we present a new polymorphic crystal structure of the p-type small molecule semiconductor 2,9-didecyldinaphtho[2,3-b:2′,3′-f]thieno[3,2-b]thiophene (C10-DNTT). The polymorphic transition is observed during heating the films over 400 K and investigated by in situ cross-polarized optical microscopy (CPOM) and in situ grazing-incidence wide-angle X-ray scattering (GIWAXS) measurements. From these measurements, we refine the thin-film crystal structure of both the low temperature and high temperature polymorphs. We further analyze the thermal expansion of both polymorphs and perform density-functional theory (DFT) calculations to trace back the anisotropic thermal expansion to anisotropic molecular interactions.

Original languageEnglish
Pages (from-to)507-519
Number of pages13
JournalMolecular Systems Design and Engineering
Volume7
Issue number5
DOIs
StatePublished - 31 Jan 2022

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