Fluoropolymer-diluted small molecule organic semiconductors with extreme thermal stability Academic Article uri icon

abstract

  • © 2018 Author(s). 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.

author list (cited authors)

  • Price, J. S., Wang, B., Kim, T., Grede, A. J., Sandoval, J. M., Xie, R., ... Giebink, N. C.

citation count

  • 4

publication date

  • December 2018