Fluoropolymer-diluted small molecule organic semiconductors with extreme thermal stability

Jared S. Price, Baomin Wang, Taehwan Kim, Alex J. Grede, Jesse M. Sandoval, Renxuan Xie, Yufei Shen, DIllon R. Adams, Michael J. Eller, Anatoliy Sokolov, Sukrit Mukhopadhyay, Peter Trefonas, Enrique D. Gomez, Emile A. Schweikert, Noel C. Giebink

Research output: Contribution to journalArticlepeer-review

4 Scopus citations

Abstract

Thermal stability is important for many thin film organic semiconductor devices but is challenging due to their weakly Van der Waals-bonded nature. Here, we show that diluting common small molecule hole transport materials through co-evaporation with the amorphous fluoropolymer Teflon AF leads to a dramatic improvement in their thermal and morphological stability without sacrificing electrical performance. Blend films with 25 vol. % Teflon decrease the drive voltage of single layer hole-only devices by more than 30% and dramatically increase their operating temperature limit to over 250 °C. The stability improvement appears to result from a nanoscale network of Teflon chains that repolymerize throughout the blend film following evaporation and inhibit gross movement of the organic semiconductor molecules. These results open up a pathway to stabilize the morphology of small molecule organic semiconductors and point to a more general opportunity to exploit semiconductor dilution to systematically vary thermal, optical, and other material properties without compromising electrical transport.

Original languageEnglish (US)
Article number263302
JournalApplied Physics Letters
Volume113
Issue number26
DOIs
StatePublished - Dec 24 2018

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy (miscellaneous)

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