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Charge Dynamics Study of the Percolation Threshold in a Polymer-Fullerene Composite System
- Authors
- Mo, Kyu Hyun; Choi, Dong Min; Lee, Cheol Eui
- Issue Date
- 3월-2019
- Publisher
- KOREAN PHYSICAL SOC
- Keywords
- Charge dynamics; Fullerene-doped MEH-PPV conjugated polymers; Percolation threshold
- Citation
- JOURNAL OF THE KOREAN PHYSICAL SOCIETY, v.74, no.5, pp.527 - 529
- Indexed
- SCIE
SCOPUS
KCI
- Journal Title
- JOURNAL OF THE KOREAN PHYSICAL SOCIETY
- Volume
- 74
- Number
- 5
- Start Page
- 527
- End Page
- 529
- ISSN
- 0374-4884
- Abstract
- 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.
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