A fullerene percolation threshold has been identified in the current density-voltage (J-V) characteristics of a 5-(2’-ethyl-hexyloxy)-p-phenylene-vinylene (MEH-PPV) conjugated polymer and fullerene (C 60 ) composite system. Charge dynamics associated with the percolation threshold was studied in this work by means of time-of-flight (TOF) measurements of the charge carrier mobilities. The hole mobility showed little change up to a fullerene concentration of 1 wt.%. On the other hand, the electron mobility increased with increasing fullerene concentration and exhibited a critical behavior with a maximum at a percolation threshold of 0.8 wt.%, at which a minimum in the energetic disorder took place.
Bibliographical noteFunding Information:
This work was supported by the National Research Foundation of Korea (Project No. 2016R1D1A1A 09917003). The Korea Basic Science Institute (KBSI) is acknowledged for the measurements.
© 2019, The Korean Physical Society.
- Charge dynamics
- Fullerene-doped MEH-PPV conjugated polymers
- Percolation threshold
ASJC Scopus subject areas
- Physics and Astronomy(all)