Conductivity and power factor enhancement of n-type semiconducting polymers using sodium silica gel dopant

This work demonstrates the use of sodium silica gel (Na-SG) particles as a reducing agent for n-type conjugated polymers to improve the conductivity and thermoelectric properties. Substantial increase in the electrical conductivity (σ, from 10−7 to 10−3 S/cm in air) was observed in two naphthalenete...

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Veröffentlicht in:APL materials 2017-08, Vol.5 (8), p.086106-086106-6
Hauptverfasser: Madan, Deepa, Zhao, Xingang, Ireland, Robert M., Xiao, Derek, Katz, Howard E.
Format: Artikel
Sprache:eng
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Zusammenfassung:This work demonstrates the use of sodium silica gel (Na-SG) particles as a reducing agent for n-type conjugated polymers to improve the conductivity and thermoelectric properties. Substantial increase in the electrical conductivity (σ, from 10−7 to 10−3 S/cm in air) was observed in two naphthalenetetracarboxylic diimide solution-processable n-type polymers, one of which was designed and synthesized in our lab. Systematic investigations of electrical conductivity were done by varying the weight percentage of Na-SG in the polymers. Additional evidence for the reduction process was obtained from electron spin resonance spectroscopy and control experiments involving nonreducing silica particles and non-electron-accepting polystyrene. The Seebeck coefficient S of the highest conductivity sample was measured and found to be in agreement with an empirical model. All the electrical conductivity and Seebeck coefficients measurements were performed in ambient atmosphere.
ISSN:2166-532X
2166-532X
DOI:10.1063/1.4990139