Charge Dynamics Study of the Percolation Threshold in a Polymer-Fullerene Composite System
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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 (C60) 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.
KeywordsCharge dynamics Fullerene-doped MEH-PPV conjugated polymers Percolation threshold
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- S. P. Lee, H. Choi, K. W. Lee, K. H. Mo, J. W. Jang, E. Lee, I-M. Kim and C. E. Lee, J. Korean Phys. Soc. 48, 146 (2006).Google Scholar