Charge transport was studied in composites of poly[2-methoxy-5-(2′-ethyl-hexyloxy)-p-phenylene-vinylene] (MEH-PPV) conjugate polymer and low-concentration fullerenes (C60) below the percolation threshold. The electron mobility showed a linear increase with the fullerene concentration, to which the hole mobility was insensitive. Our results indicate that fullerene-polymer networks provide a conduction path to the electrons, whereas the holes are transported through the polymer-only paths. The microscopic environments of the two distinct conduction paths in the composites as revealed by the electric field dependence of the mobilities are also discussed.
Bibliographical noteFunding Information:
This work was supported by the Korea Ministry of Education, Science and Technology (NRL Program R0A-2008-000-20066-0, User Program of Proton Engineering Frontier Project, KRF-2006-005-J03601). This work was also supported by the Seoul Research and Business Development Program (Grant No. 10583). The measurements at the Korean Basic Science Institute (KBSI) are acknowledged.
- Charge transport
- Low-concentration MEH-PPV/fullerene composites
ASJC Scopus subject areas
- General Materials Science
- General Physics and Astronomy