期刊
ORGANIC ELECTRONICS
卷 38, 期 -, 页码 264-270出版社
ELSEVIER SCIENCE BV
DOI: 10.1016/j.orgel.2016.08.030
关键词
Anisotropic; Conducting polymers; Organic electronics; Doping
资金
- NEDO (TherMAT)
- MEXT, Japan [15K17927]
- Grants-in-Aid for Scientific Research [15K17927] Funding Source: KAKEN
The through-plane conductivity of a film sample is critically important because it largely affects the performance of batteries, capacitors, and thermoelectric devices. In this study, we developed a modified four-probe through-plane electrical conductivity measurement method using a coaxial structure. This method is general and works for free-standing film samples. We studied different samples including a steel sheet, highly oriented pyrolytic graphite, and conducting polymers. We confirmed metallic transportation in the steel sheet and hopping transportation in graphite in the through-plane direction by conducting low temperature measurements at 100 K. In the case of a conducting polymer poly(3,4-ethylenedioxythiophene)/polystyrene sulfonate, the conductivity anisotropic ratio decreases with increasing in-plane conductivity. Temperature dependent measurements show two distinct activation energy regimes in the through-plane direction in PEDOT/PSS but almost no change in the in-plane electrical conductivity activation energy. This could be due to additional carrier paths that occur through the more disordered region (the PSS-rich region) in the through-plane direction. We also examined the Meyer-Neldel rule in PEDOT/PSS and concluded that PEDOT/PSS follows the anti-Meyer-Neldel rule, likely due to the high carrier density in the film. (C) 2016 Elsevier B.V. All rights reserved.
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