Isothermal crystallization and time-temperature-transformation diagram of the organic semiconductor 5,11-bis(triethylsilylethynyl)anthradithiophene

Liyang Yu, Andrew M. Zeidell, John E. Anthony, Oana D. Jurchescu, Christian Müller

Research output: Contribution to journalArticlepeer-review

2 Scopus citations

Abstract

Thermal annealing of organic semiconductors is critical for optimization of their electronic properties. The selection of the optimal annealing temperature -often done on a trial-and-error basis- is essential for achieving the most desired micro/nanostructure. While classical materials science relies on time-temperature-transformation (TTT) diagrams to predict such processing-structure relationships, this type of approach is yet to find widespread application in the field of organic electronics. In this work, we constructed a TTT diagram for crystallization of the widely studied organic semiconductor 5,11-bis(triethylsilylethynyl)anthradithiophene (TES-ADT) from its melt. Thermal analysis in the form of isothermal crystallization experiments showed distinctly different types of behaviour depending on the annealing temperature, in agreement with classical crystal nucleation and growth theory. Hence, the TTT diagram correlates with the observed variation in the number of crystal domains, the crystal coverage and film texture as well as the obtained polymorph. As a result, we are able to rationalize the influence of the annealing temperature on the charge-carrier mobility extracted from field-effect transistor (FET) measurements. Evidently, the use of TTT diagrams is a powerful tool to describe structure formation of organic semiconductors and can be used to predict processing protocols that lead to optimal device performance.

Original languageEnglish
Pages (from-to)11745-11752
Number of pages8
JournalJournal of Materials Chemistry C
Volume9
Issue number35
DOIs
StatePublished - Sep 21 2021

Bibliographical note

Funding Information:
We gratefully acknowledge funding from the Knut and Alice Wallenberg Foundation through the project ‘‘Mastering Morphology for Solution-borne Electronics’’. L. Y. thanks the National Natural Science Foundation of China (NSFC, 21905185) and the Fundamental Research Funds for the Central Universities (YJ201957) for financial support. The authors thanks CHESS (supported by NSF Award DMR-1332208) for providing experimental time for GIWAXS measurements. The work at WFU was supported by the National Science Foundation under awards DMR-1627925 and ECCS-1810273.

Publisher Copyright:
© The Royal Society of Chemistry 2021.

ASJC Scopus subject areas

  • Chemistry (all)
  • Materials Chemistry

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